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RSS2003 Vol. 27, No. 4
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2003, 27(4): 273-275.
[Abstract]
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Abstract:
After strengthening two states of 7050,one kind of aerial aluminum alloy,T7451 and T7452 with laser shock processing device developed by ourselves,the alloys' surface stress and structure are measured.Test results show that there is large residual compressive stress on the surface and internal dislocation density.However S-N curve in fatigue test shows that the fatigue strength in increased more than two times under the condition of moderate load strengthening.
After strengthening two states of 7050,one kind of aerial aluminum alloy,T7451 and T7452 with laser shock processing device developed by ourselves,the alloys' surface stress and structure are measured.Test results show that there is large residual compressive stress on the surface and internal dislocation density.However S-N curve in fatigue test shows that the fatigue strength in increased more than two times under the condition of moderate load strengthening.
2003, 27(4): 276-278.
Abstract:
LSM240 fully automatic SLAB laser welding machine is used to weld Fe-based,Ni-based,Co-based powder materials in order to study the important factors for welding quality,i.e.the defocus,welding speed and specific energy.Results show that Ni is the most sensitive to the defocus.The formula of the relation of penetration H and specific energy input W is gotten.
LSM240 fully automatic SLAB laser welding machine is used to weld Fe-based,Ni-based,Co-based powder materials in order to study the important factors for welding quality,i.e.the defocus,welding speed and specific energy.Results show that Ni is the most sensitive to the defocus.The formula of the relation of penetration H and specific energy input W is gotten.
2003, 27(4): 279-281,292.
Abstract:
A LD pumped Nd3+∶YVO4 laser emitting at 1342nm is introduced.The laser output power about 296mW was obtained,the maximum slope efficiency is up to 21.2%.The spectrum curve at 1342nm and the input-output power curve are given.
A LD pumped Nd3+∶YVO4 laser emitting at 1342nm is introduced.The laser output power about 296mW was obtained,the maximum slope efficiency is up to 21.2%.The spectrum curve at 1342nm and the input-output power curve are given.
2003, 27(4): 282-284.
Abstract:
A stable low-threshold self-Q-switched diode-pumped 946nm Nd3+,Cr4+∶YAG microchip laser operating in single frequency and fundamental transversal mode is presented in this paper.The output slope efficiency of 22% is achieved.Combining the microchip and an external frequency doubler,473nm blue laser emission is achieved with an optical conversion efficiency of 15%.
A stable low-threshold self-Q-switched diode-pumped 946nm Nd3+,Cr4+∶YAG microchip laser operating in single frequency and fundamental transversal mode is presented in this paper.The output slope efficiency of 22% is achieved.Combining the microchip and an external frequency doubler,473nm blue laser emission is achieved with an optical conversion efficiency of 15%.
2003, 27(4): 285-287.
Abstract:
Dimethylthriourea(DMTU) is an effective free radical scavenger.Through investigation of histopathological and biochemical changes,we have obseved the effects of DMTU on rabbit retina in laser injury.The results show that photoreceptor cells die mainly of apoptosis in laser-induced retina degeneration and DMTU demonstrate the neropotective effect due to inhibition of lipid peroxidation.
Dimethylthriourea(DMTU) is an effective free radical scavenger.Through investigation of histopathological and biochemical changes,we have obseved the effects of DMTU on rabbit retina in laser injury.The results show that photoreceptor cells die mainly of apoptosis in laser-induced retina degeneration and DMTU demonstrate the neropotective effect due to inhibition of lipid peroxidation.
2003, 27(4): 288-292.
Abstract:
Optical space switch arrays that can offer nanoseconds switch time as the devices are integrated to larger and larger arrays will meet the demand of high speed and agile routing of packets in future optical packet switching networks.Under the analysis of scalable limitations toward ordinary optical space switch matrix based on semiconductor optical amplifier,basic principles of novel arrays which can be easily scaled to significantly larger sizes are presented,as well as their progress.
Optical space switch arrays that can offer nanoseconds switch time as the devices are integrated to larger and larger arrays will meet the demand of high speed and agile routing of packets in future optical packet switching networks.Under the analysis of scalable limitations toward ordinary optical space switch matrix based on semiconductor optical amplifier,basic principles of novel arrays which can be easily scaled to significantly larger sizes are presented,as well as their progress.
2003, 27(4): 293-295,306.
Abstract:
Laser frequency splitting technology can be used to measure phase retardation of a wave-plate.With the wave-plate inserted into a laser cavity to split longitudinal laser,its phase retardation can be calculated by detecting the frequency differences between the same order or the adjacent order split longitudinal modes.No mechanical parameters but only the frequencies of optical beats need to be measured,and the measurement can be traced to the wavelength of the laser.Experiments prove that a resolution of 0.003° and a repeatability of 0.05° can be ensured.For a quartz quarter wave-plate of 1.5mm thick,the incertitude of the system is about 1′.
Laser frequency splitting technology can be used to measure phase retardation of a wave-plate.With the wave-plate inserted into a laser cavity to split longitudinal laser,its phase retardation can be calculated by detecting the frequency differences between the same order or the adjacent order split longitudinal modes.No mechanical parameters but only the frequencies of optical beats need to be measured,and the measurement can be traced to the wavelength of the laser.Experiments prove that a resolution of 0.003° and a repeatability of 0.05° can be ensured.For a quartz quarter wave-plate of 1.5mm thick,the incertitude of the system is about 1′.
2003, 27(4): 296-298.
Abstract:
An opening loop control system of high-precision laser wavelength output of BBO optical parametric oscillation tuning system with American General Scanning Inc.'s controller to control BBO crystal's rotation is realized.The control system's relative wavelength tuning error is less than 0.04%.We also demonstrated 0.347μm laser pumped type-Ⅰ phase matching BBO optical parametric oscillation's theoretical and experimental curve of output wavelength vs incident angle of pump light.
An opening loop control system of high-precision laser wavelength output of BBO optical parametric oscillation tuning system with American General Scanning Inc.'s controller to control BBO crystal's rotation is realized.The control system's relative wavelength tuning error is less than 0.04%.We also demonstrated 0.347μm laser pumped type-Ⅰ phase matching BBO optical parametric oscillation's theoretical and experimental curve of output wavelength vs incident angle of pump light.
2003, 27(4): 299-301.
Abstract:
Based on matrix decomposition method,the analytical propagation expression for Gaussian beams passing through complicated ABCD optical systems with internal hard-edge aperture is derived and analyzed physically.The theoretical result is illustrated with numerical examples of Gaussian beams passing through a spatial filter.Finally its extensive application is also discussed.
Based on matrix decomposition method,the analytical propagation expression for Gaussian beams passing through complicated ABCD optical systems with internal hard-edge aperture is derived and analyzed physically.The theoretical result is illustrated with numerical examples of Gaussian beams passing through a spatial filter.Finally its extensive application is also discussed.
2003, 27(4): 302-303.
Abstract:
In order to explain polarized light and its polarization state visually,Poincare sphere is introduced through coordinate conversion.Its characteristics are throughly discussed and illuminated.To solve the problems such as the polarized state changes after polarized light passes through some polarizing components,Poincare sphere is more visual and definite than other time-vector methods.
In order to explain polarized light and its polarization state visually,Poincare sphere is introduced through coordinate conversion.Its characteristics are throughly discussed and illuminated.To solve the problems such as the polarized state changes after polarized light passes through some polarizing components,Poincare sphere is more visual and definite than other time-vector methods.
2003, 27(4): 304-306.
Abstract:
The differences of SBS pulse-width,energy and shape were investigated in experiment under the same conditions.And the influences of the liquid medium absorption coefficient on the characteristics of SBS were analyzed and discussed.
The differences of SBS pulse-width,energy and shape were investigated in experiment under the same conditions.And the influences of the liquid medium absorption coefficient on the characteristics of SBS were analyzed and discussed.
2003, 27(4): 307-310.
Abstract:
Laser cladding experiment of Ti+33%TiC was carried out on Ti-6Al-4V alloy substrate,then the microstructure of the clad layer was analyzed with SEM and its strengthening mechanism was discussed.Microstructure analyses show that the clad coating can be divided into three zones along the depth direction:clad,binding and heat-affected zones.TiC in the clad zone exists in the form of fine dendrites,Ti matrix filling among TiC dendrites play a role of connecting the TiC and transferring load,so the clad coating has been strengthened obviously.
Laser cladding experiment of Ti+33%TiC was carried out on Ti-6Al-4V alloy substrate,then the microstructure of the clad layer was analyzed with SEM and its strengthening mechanism was discussed.Microstructure analyses show that the clad coating can be divided into three zones along the depth direction:clad,binding and heat-affected zones.TiC in the clad zone exists in the form of fine dendrites,Ti matrix filling among TiC dendrites play a role of connecting the TiC and transferring load,so the clad coating has been strengthened obviously.
2003, 27(4): 311-316.
Abstract:
In the field of optical wireless links,concentrators that are designed by the tools of nonimaging optics can be used to collect the light radiation and are more compact and have higher collection efficiencies than imaging concentrators.Hemispherical concentrators are studied by ray tracing,then for several normal nonimaging concentrators: hemispherical concentrators,compound parabolic concentrators (CPC),dielectric totally internally reflecting concentrators (DTIRC),simultaneous multiple surfaces concentrators (SMS) and inhomogeneous media concentrators (Poisson bracket),the design methods and the performances e.g.the gain and the field of view (FOV) are compared as well as the application suggestion.
In the field of optical wireless links,concentrators that are designed by the tools of nonimaging optics can be used to collect the light radiation and are more compact and have higher collection efficiencies than imaging concentrators.Hemispherical concentrators are studied by ray tracing,then for several normal nonimaging concentrators: hemispherical concentrators,compound parabolic concentrators (CPC),dielectric totally internally reflecting concentrators (DTIRC),simultaneous multiple surfaces concentrators (SMS) and inhomogeneous media concentrators (Poisson bracket),the design methods and the performances e.g.the gain and the field of view (FOV) are compared as well as the application suggestion.
2003, 27(4): 317-320.
Abstract:
Experiments show that metal surface properties may produce four results through laser strengthening treatment,i.e.non-transformation hardening,transformation hardening,shallow melt and melt.After analysis,the relationships between the four classifications and laser processing parameters,such as laser power,laser processing beam diameter,laser scanning velocity,have been established based on artificial neural network.HT300 experiments show that laser processing parameters can be chosen conveniently and material surface quality can be controlled effectively.
Experiments show that metal surface properties may produce four results through laser strengthening treatment,i.e.non-transformation hardening,transformation hardening,shallow melt and melt.After analysis,the relationships between the four classifications and laser processing parameters,such as laser power,laser processing beam diameter,laser scanning velocity,have been established based on artificial neural network.HT300 experiments show that laser processing parameters can be chosen conveniently and material surface quality can be controlled effectively.
2003, 27(4): 321-324,327.
Abstract:
The development of semiconductor LDs materials and a few technical progresses for GaN-based semiconductor materials are reviewed.The development course of GaN-based LDs is also described in the paper.
The development of semiconductor LDs materials and a few technical progresses for GaN-based semiconductor materials are reviewed.The development course of GaN-based LDs is also described in the paper.
2003, 27(4): 325-327.
Abstract:
A novel multiple-active-region tunneling regenerated strained-quantum-well vertical-cavity surface-emitting laser(VCSEL),whose differential quantum efficiency is larger than unity and whose performance is expected to be improved,especially the threshold current is expected to be reduced and the output power is expected to be increased,was designed.Then the output power,threshold current of the novel structure and those of the traditional structure were compared under the conditions of the same reflectivity and injected current.So the advantages of the novel structure have been proved in theory.
A novel multiple-active-region tunneling regenerated strained-quantum-well vertical-cavity surface-emitting laser(VCSEL),whose differential quantum efficiency is larger than unity and whose performance is expected to be improved,especially the threshold current is expected to be reduced and the output power is expected to be increased,was designed.Then the output power,threshold current of the novel structure and those of the traditional structure were compared under the conditions of the same reflectivity and injected current.So the advantages of the novel structure have been proved in theory.
The influence of folded-resonator parameters on the stability ofintracavity-frequency-doubled lasers
2003, 27(4): 328-330.
Abstract:
The thermally stable condition of V-shaped intracavity-frequency-doubled lasers with folded resonator is analyzed based on the matrix optics.The influence of resonator parameters including the resonator length,curvature radii of mirrors and thermal focal lengths of the laser rod and doubled crystal on the system stability is analyzed with numerical examples.
The thermally stable condition of V-shaped intracavity-frequency-doubled lasers with folded resonator is analyzed based on the matrix optics.The influence of resonator parameters including the resonator length,curvature radii of mirrors and thermal focal lengths of the laser rod and doubled crystal on the system stability is analyzed with numerical examples.
2003, 27(4): 331-333.
Abstract:
In order to realize the powerful and stable output of 532nm green laser,4.2W of CW TEM00 output at 532nm was successfully obtained by means of four-mirror Z-cavity resonant structure,LD end-pumped Nd∶YVO4 and LBO intracavity-doubling with Ⅰ-type angle-match.When the total pumping power of double ends LD is 26W,the optical-optical conversion efficiency is 17.6%.The most important thing is all instruments used are made in our country,which indicates that we have the ability of producing W-level all-solid-state green laser in commercial.
In order to realize the powerful and stable output of 532nm green laser,4.2W of CW TEM00 output at 532nm was successfully obtained by means of four-mirror Z-cavity resonant structure,LD end-pumped Nd∶YVO4 and LBO intracavity-doubling with Ⅰ-type angle-match.When the total pumping power of double ends LD is 26W,the optical-optical conversion efficiency is 17.6%.The most important thing is all instruments used are made in our country,which indicates that we have the ability of producing W-level all-solid-state green laser in commercial.
2003, 27(4): 334-336.
Abstract:
The experimental study of the influence of laser spatial coherence on illumination uniformity is made.It is shown that the coherence property of laser affects the illumination uniformity.The scintillation index and the power spectral density of the illumination spot on the target decrease with decreasing spatial coherence of laser beams.As a result,the illumination uniformity can be improved.The experimental results obtained in this paper are useful for appropriately choosing the laser illuminator in practice.
The experimental study of the influence of laser spatial coherence on illumination uniformity is made.It is shown that the coherence property of laser affects the illumination uniformity.The scintillation index and the power spectral density of the illumination spot on the target decrease with decreasing spatial coherence of laser beams.As a result,the illumination uniformity can be improved.The experimental results obtained in this paper are useful for appropriately choosing the laser illuminator in practice.
2003, 27(4): 337-338,341.
Abstract:
Though analyzing the imaging theory of dual galvanometer scanning system,the distortion formula of the scanning system were educed.Based on the formula,one circuit was designed to correct the distortion and perfect pictures were achieved.This correcting technology has been used in laser marking systems.
Though analyzing the imaging theory of dual galvanometer scanning system,the distortion formula of the scanning system were educed.Based on the formula,one circuit was designed to correct the distortion and perfect pictures were achieved.This correcting technology has been used in laser marking systems.
2003, 27(4): 339-341.
Abstract:
Passively Q-switched Cr4+∶YAG/Nd∶YAG all-solid-state infrared laser,pumped by a diode laser,was designed.Then with a lens of 100mm focal length focusing the 1064nm IR laser to a 9mm KTP second-harmonic generation crystal,a green laser pulse was obtained with average output power of 29mW.At last,with a lens of 30mm focal length focusing the 532nm green laser to a 4mm length of BBO fourth-harmonic generation crystal,an ultraviolet laser pulse at 266nm was obtained with peak power of 7.3W,average output power of 1.1mW,repetition rate of 12.5kHz,pulse duration of 12ns.Ratio of green-ultraviolet power conversion is 3.8%,and that of infrared-ultraviolet power conversion is 0.7%.
Passively Q-switched Cr4+∶YAG/Nd∶YAG all-solid-state infrared laser,pumped by a diode laser,was designed.Then with a lens of 100mm focal length focusing the 1064nm IR laser to a 9mm KTP second-harmonic generation crystal,a green laser pulse was obtained with average output power of 29mW.At last,with a lens of 30mm focal length focusing the 532nm green laser to a 4mm length of BBO fourth-harmonic generation crystal,an ultraviolet laser pulse at 266nm was obtained with peak power of 7.3W,average output power of 1.1mW,repetition rate of 12.5kHz,pulse duration of 12ns.Ratio of green-ultraviolet power conversion is 3.8%,and that of infrared-ultraviolet power conversion is 0.7%.
2003, 27(4): 342-344,348.
Abstract:
Based on the propagation equation used to describe the normalized amplitude evolution in the fiber,the evolution of super-Gaussian optical pulse propagating in the single-mode fiber has been investigated numerically.The results show that for an incident super-Gaussian pulse with steep edges,the evolution of its shape,frequency chirp,and peak intensity are different from those for an incident Gaussian pulse.Its shape undergoes a variation from near-rectangular,multi-peak,and finally to single-peak;its frequency chirp is not linear;and its peak intensity increases at first,then passing a maximum,and finally decreases monotonously.And these evolutions relate to the shape and frequency chirp of the incident super-Gaussian optical pulse.
Based on the propagation equation used to describe the normalized amplitude evolution in the fiber,the evolution of super-Gaussian optical pulse propagating in the single-mode fiber has been investigated numerically.The results show that for an incident super-Gaussian pulse with steep edges,the evolution of its shape,frequency chirp,and peak intensity are different from those for an incident Gaussian pulse.Its shape undergoes a variation from near-rectangular,multi-peak,and finally to single-peak;its frequency chirp is not linear;and its peak intensity increases at first,then passing a maximum,and finally decreases monotonously.And these evolutions relate to the shape and frequency chirp of the incident super-Gaussian optical pulse.
2003, 27(4): 345-348.
Abstract:
Numerical analysis of the Er3+/Yb3+ co-doped double clad fiber laser has been preformed.The distribution of pump light and laser power along the function of output power versus pump power,the effect of fiber length and mirror reflectivity on output power have been analyzed.The calculated slope efficiency is up to 56.3%.It is relatively close to the quantum limit.
Numerical analysis of the Er3+/Yb3+ co-doped double clad fiber laser has been preformed.The distribution of pump light and laser power along the function of output power versus pump power,the effect of fiber length and mirror reflectivity on output power have been analyzed.The calculated slope efficiency is up to 56.3%.It is relatively close to the quantum limit.
2003, 27(4): 349-351,356.
Abstract:
After defining the power conversion efficiency(PCE) of fiber Raman amplifiers(FRAs),the PCE of Raman amplifiers under different conditions is analyzed.Then the changes of PCE with input power,input power and gain fiber length of FRAs are discussed.The difference of PCE between the distributed FRA and the discrete FRA is compared.Finally how to improve the PCE of FRAs is presented.
After defining the power conversion efficiency(PCE) of fiber Raman amplifiers(FRAs),the PCE of Raman amplifiers under different conditions is analyzed.Then the changes of PCE with input power,input power and gain fiber length of FRAs are discussed.The difference of PCE between the distributed FRA and the discrete FRA is compared.Finally how to improve the PCE of FRAs is presented.
2003, 27(4): 352-356.
Abstract:
The mechanism of scribing ceramic substrate with RF CO2 laser and fundamental choice law of technical parameters are analyzed.Through numerical simulation and experiment,the influences of factors such as frequency of pulse,pulse width,scribing speed,pressure of assistant air on the quality of laser scribing are investigated.
The mechanism of scribing ceramic substrate with RF CO2 laser and fundamental choice law of technical parameters are analyzed.Through numerical simulation and experiment,the influences of factors such as frequency of pulse,pulse width,scribing speed,pressure of assistant air on the quality of laser scribing are investigated.
2003, 27(4): 357-361.
Abstract:
This paper introduces the necessity of beam shaping for LDA beam.Some typical beam shaping methods' shaping principles,key techniques and shaping effects are areanalyzed,compared and assessed for the first time.
This paper introduces the necessity of beam shaping for LDA beam.Some typical beam shaping methods' shaping principles,key techniques and shaping effects are areanalyzed,compared and assessed for the first time.
2003, 27(4): 362-364.
Abstract:
The change of the splitting angle of a Wollaston prism with the variation of a random incident angle is theoretically analyzed through reflection law and coordinate conversion.Different from the present documents,the relation between splitting angle and incident angle is put forward when azimuth angle has different fixed value.Experimental results are coincident with the theoretical outcome.
The change of the splitting angle of a Wollaston prism with the variation of a random incident angle is theoretically analyzed through reflection law and coordinate conversion.Different from the present documents,the relation between splitting angle and incident angle is put forward when azimuth angle has different fixed value.Experimental results are coincident with the theoretical outcome.
2003, 27(4): 365-367.
Abstract:
A mathematic model of frequency shift of atmospheric Brillouin scattering light is established and the influences of the mathematic parameters,such as air temperature,air pressure,vapor pressure,on the property of Brillouin scattering have been analyzed.The result shows that the frequency shift of Brillouin scattering light is scarcely influenced by air pressure and vapor pressure,and greatly affected by air temperature.The result has some referenced value for the detection of concealed object in atmosphere.
A mathematic model of frequency shift of atmospheric Brillouin scattering light is established and the influences of the mathematic parameters,such as air temperature,air pressure,vapor pressure,on the property of Brillouin scattering have been analyzed.The result shows that the frequency shift of Brillouin scattering light is scarcely influenced by air pressure and vapor pressure,and greatly affected by air temperature.The result has some referenced value for the detection of concealed object in atmosphere.
2003, 27(4): 368-370.
Abstract:
The paper puts forward configurable parameter of reflective quarter wave-plate at normal incidence with extended boundary condition method due to absent report about reflective quarter wave-plates made of gratings.we find phase difference between TE wave and TM wave can satisfy designed requisition at some accuracy in a long span of groove depth which can reduce practical difficulty of etching groove depth,but papers issued before always require strict etching groove depth.Azimuth problem when lineary polarized light transforms circinal polarized light is discussed at the same time.
The paper puts forward configurable parameter of reflective quarter wave-plate at normal incidence with extended boundary condition method due to absent report about reflective quarter wave-plates made of gratings.we find phase difference between TE wave and TM wave can satisfy designed requisition at some accuracy in a long span of groove depth which can reduce practical difficulty of etching groove depth,but papers issued before always require strict etching groove depth.Azimuth problem when lineary polarized light transforms circinal polarized light is discussed at the same time.
2003, 27(4): 371-373.
Abstract:
In this paper,chirp caused by polarization modes coupling on the input pulse with initial chirp is investigated.The function of chirp is induced through coupled nonlinear Schrodinger equation.Every factor's effect on the chirp is discussed.The results show:input polarization angle causes the chirp differs in the two polarization directions;for a single polarization direction,the weak polarization walk-off effect influences the chirp to a certain degree,while the strong influences little;the initial chirp prominently decides that caused by polarization modes coupling.
In this paper,chirp caused by polarization modes coupling on the input pulse with initial chirp is investigated.The function of chirp is induced through coupled nonlinear Schrodinger equation.Every factor's effect on the chirp is discussed.The results show:input polarization angle causes the chirp differs in the two polarization directions;for a single polarization direction,the weak polarization walk-off effect influences the chirp to a certain degree,while the strong influences little;the initial chirp prominently decides that caused by polarization modes coupling.
2003, 27(4): 374-376,379.
Abstract:
Starting from the propagation law of partially coherent light,an analytical equation of intensity distributions of partially coherent light expressed in terms of the Gaussian-Schell model (GSM) beam propagating through an astigmatic lens is derived,and numerical calculations are performed.It is shown that the astigmatism affects the focusing properties of partially coherent light.Compared with the stigmatic lens,the astigmatism gives rise to a shift of the position of on-axis maximum intensity,and reduces the intensity at the real focal point.
Starting from the propagation law of partially coherent light,an analytical equation of intensity distributions of partially coherent light expressed in terms of the Gaussian-Schell model (GSM) beam propagating through an astigmatic lens is derived,and numerical calculations are performed.It is shown that the astigmatism affects the focusing properties of partially coherent light.Compared with the stigmatic lens,the astigmatism gives rise to a shift of the position of on-axis maximum intensity,and reduces the intensity at the real focal point.
2003, 27(4): 377-379.
Abstract:
Muller matrix for the rotation character of λ/4 quartz wave-plate is deduced through matrix optic,and the character is described by means of poincare sphere.Finally the error induced by the rotation of λ/4 quartz wave-plate is analyzed by poincare sphere.
Muller matrix for the rotation character of λ/4 quartz wave-plate is deduced through matrix optic,and the character is described by means of poincare sphere.Finally the error induced by the rotation of λ/4 quartz wave-plate is analyzed by poincare sphere.
2003, 27(4): 380-382.
Abstract:
Light energy transfering between two plastic fiber dual-taper by using sphere,cylinder and rectangle cavity (all called medium cavity) is reported.The emitting efficiency of fiber dual-taper is measured.The coupling efficiency of medium cavity relative to its receiving surface area and distance between taper and cavity are also measured.This devices can be used to develop a new type optical add-drop multiplexer.
Light energy transfering between two plastic fiber dual-taper by using sphere,cylinder and rectangle cavity (all called medium cavity) is reported.The emitting efficiency of fiber dual-taper is measured.The coupling efficiency of medium cavity relative to its receiving surface area and distance between taper and cavity are also measured.This devices can be used to develop a new type optical add-drop multiplexer.
2003, 27(4): 383-384.
Abstract:
The principle of determination of the phase delay angle of a wave-plate with a quarter wave-plate is put forward.The measurement experiment is introduced.
The principle of determination of the phase delay angle of a wave-plate with a quarter wave-plate is put forward.The measurement experiment is introduced.
