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RSS2001 Vol. 25, No. 6
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2001, 25(6): 401-405.
[Abstract]
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Abstract:
The structure characteristics and the properties of laser clad ceramic and its composite coatings are reviewed. The form mechanism of clad layer and bonding zone structure and the dissolved behavior of the ceramic phase in ceramic metal composite coatings are analyzed. The effect of the cladding technologies,especially the scanning speed and the lapping treatment on the structure of clad coatings is expounded.
The structure characteristics and the properties of laser clad ceramic and its composite coatings are reviewed. The form mechanism of clad layer and bonding zone structure and the dissolved behavior of the ceramic phase in ceramic metal composite coatings are analyzed. The effect of the cladding technologies,especially the scanning speed and the lapping treatment on the structure of clad coatings is expounded.
2001, 25(6): 406-409.
Abstract:
The distribution measurement of the troppospheric ozone from the altitude of 2km to 4km with differential lidar is reported in the paper.The measurement results show that the ozone density can be obtained with higher accuracy based on lidar with two wavelengths(266nm and 289nm) that are produced by a YAG laser.
The distribution measurement of the troppospheric ozone from the altitude of 2km to 4km with differential lidar is reported in the paper.The measurement results show that the ozone density can be obtained with higher accuracy based on lidar with two wavelengths(266nm and 289nm) that are produced by a YAG laser.
2001, 25(6): 409-411.
Abstract:
The influence of the total internal reflection angle and refractive on the phase retardation is discussed in the paper.Based on this theory,oblique incidence achromatic phase retarder is optimized.
The influence of the total internal reflection angle and refractive on the phase retardation is discussed in the paper.Based on this theory,oblique incidence achromatic phase retarder is optimized.
2001, 25(6): 412-417.
Abstract:
A large number of studies concentrate on laser cutting real time monitoring in recent years.The emitted near infrared radiation from cut front is usually used as the detected signal,which is collected co-axially with the path of laser beam on the cut front.Several typical monitoring methods are presented in the paper.In terms of industrial application,their advantages and disadvantages are analyzed.
A large number of studies concentrate on laser cutting real time monitoring in recent years.The emitted near infrared radiation from cut front is usually used as the detected signal,which is collected co-axially with the path of laser beam on the cut front.Several typical monitoring methods are presented in the paper.In terms of industrial application,their advantages and disadvantages are analyzed.
2001, 25(6): 417-420.
Abstract:
There is an application requirement for Q-switched solid state laser systems with high average power,which can be achieved with a Nd:YAG oscillator amplifier system.Theoretical analysis is executed for single pass Nd:YAG lasers and the analytical results are tested through experiments.
There is an application requirement for Q-switched solid state laser systems with high average power,which can be achieved with a Nd:YAG oscillator amplifier system.Theoretical analysis is executed for single pass Nd:YAG lasers and the analytical results are tested through experiments.
2001, 25(6): 421-425.
Abstract:
The system precision is directly affected by the sample edge measurement precision in laser scanning measuring technology.A new method is proposed to detect the edge through modulating scanning laser beam and picking up the phase reversal of the detection signal as the edge signal.Based on the method,the edge measurement precision can be improved less than one micron.
The system precision is directly affected by the sample edge measurement precision in laser scanning measuring technology.A new method is proposed to detect the edge through modulating scanning laser beam and picking up the phase reversal of the detection signal as the edge signal.Based on the method,the edge measurement precision can be improved less than one micron.
2001, 25(6): 425-429.
Abstract:
An extended physical model on intracavity binary wave plates based on the Jones matrix formalism that gives the prerequisite for independently intracavity frequency doubling under CW multi longitudinal mode operation has been obtained. The formulas for eliminating the noise of the frequency doubled output in phase matching type Ⅱ and type Ⅰ conditions are presented. A general condition concerning the round-trip Jones matrix has been achieved. The eigenvectors for the phase matching type Ⅱ and type Ⅰ have been determined analytically.
An extended physical model on intracavity binary wave plates based on the Jones matrix formalism that gives the prerequisite for independently intracavity frequency doubling under CW multi longitudinal mode operation has been obtained. The formulas for eliminating the noise of the frequency doubled output in phase matching type Ⅱ and type Ⅰ conditions are presented. A general condition concerning the round-trip Jones matrix has been achieved. The eigenvectors for the phase matching type Ⅱ and type Ⅰ have been determined analytically.
2001, 25(6): 430-432.
Abstract:
Three-element compound delayed depolarizer is a new kind of depolarizer.Experiments show that it has good performance.
Three-element compound delayed depolarizer is a new kind of depolarizer.Experiments show that it has good performance.
2001, 25(6): 433-437.
Abstract:
Some problems for present capability test methods for laser warning systems have been investigated in the paper.A method is proposed to review the capability of laser warning systems in terms of practical maximum range of a laser rangefinder.
Some problems for present capability test methods for laser warning systems have been investigated in the paper.A method is proposed to review the capability of laser warning systems in terms of practical maximum range of a laser rangefinder.
2001, 25(6): 437-440.
Abstract:
The preparing techniques of multi-wavelength laser protection plastic,sandwich glass are introduced in the paper.Its properties have been tested.The results indicate that this type of protection material can obviously protect radiation from laser in UV,visible and infrared range with high visibility,high stability and high anti-laser ability.
The preparing techniques of multi-wavelength laser protection plastic,sandwich glass are introduced in the paper.Its properties have been tested.The results indicate that this type of protection material can obviously protect radiation from laser in UV,visible and infrared range with high visibility,high stability and high anti-laser ability.
2001, 25(6): 441-445.
Abstract:
The detection performance of a photoelectric imaging system on 1.06μm laser facula is analyzed.Based on the result,an objective lens matching the CCD camera has been designed.Finally,the experiment results are presented.
The detection performance of a photoelectric imaging system on 1.06μm laser facula is analyzed.Based on the result,an objective lens matching the CCD camera has been designed.Finally,the experiment results are presented.
2001, 25(6): 445-448.
Abstract:
A novel appro ach to achieve single frequency,widely tunable semiconductor laser oscillation is put for ward. One appropriate candidate is a fiber ring semiconductor laser( FRSLs) with a semiconductor gain medium and an external cavity. The threshold current and output power with tuning wavelengths of FRSLs is experimentally studied. The sing lemode oscillation is demonstrated and dynamic tuning of FRSLs is realized. The output optical pulses have been tuned over a wavelength range of 36nm. The analysis confirms that there is an optimum coupler splitting ratio to trade off between wavelength tuning width and output power. The experimental results ar econsistent with theoretical simulation results.
A novel appro ach to achieve single frequency,widely tunable semiconductor laser oscillation is put for ward. One appropriate candidate is a fiber ring semiconductor laser( FRSLs) with a semiconductor gain medium and an external cavity. The threshold current and output power with tuning wavelengths of FRSLs is experimentally studied. The sing lemode oscillation is demonstrated and dynamic tuning of FRSLs is realized. The output optical pulses have been tuned over a wavelength range of 36nm. The analysis confirms that there is an optimum coupler splitting ratio to trade off between wavelength tuning width and output power. The experimental results ar econsistent with theoretical simulation results.
2001, 25(6): 449-453.
Abstract:
The pulse-shaping technique for TEA CO2 laser is one of the most important techniques to study high power and high repetition rate tunable TEA CO2 laser and its frequency conversion.The plasma shutter is a simple and practical pulse-shaping technique.The development of the plasma shutter theory and technique has been analyzed and reviesed.Finally it makes a conclusion that the plasma shutter has wide application prospect.
The pulse-shaping technique for TEA CO2 laser is one of the most important techniques to study high power and high repetition rate tunable TEA CO2 laser and its frequency conversion.The plasma shutter is a simple and practical pulse-shaping technique.The development of the plasma shutter theory and technique has been analyzed and reviesed.Finally it makes a conclusion that the plasma shutter has wide application prospect.
2001, 25(6): 454-459.
Abstract:
Laser driver is the first choice of inertial confined fusion due to its high intensity.The illumination uniform of laser on targets must be improved in order to compress the fusion pellet.The principles and techniques of several important methods use to produce uniform illumination for laser driven fusion have analyzed and their characteristics have been obtained.
Laser driver is the first choice of inertial confined fusion due to its high intensity.The illumination uniform of laser on targets must be improved in order to compress the fusion pellet.The principles and techniques of several important methods use to produce uniform illumination for laser driven fusion have analyzed and their characteristics have been obtained.
2001, 25(6): 460-463.
Abstract:
The diffuse reflectance and transmittance of rabbit arteries and veins are studied with the help of Ar+ laser.The measurements are performed with two standard integrating sphere systems.Based on Kubelka Munk model and experiments,the absorption coefficient,scattering coefficient and the changes of total optical intensities I(x),forward scattering flux i(x),backward scattering flux j(x) as a function of thickness of rabbit arteries and veins have been evaluated and analyzed.Measurement results show that there is significant difference of reflectance and transmittance between arteries and veins at 488.0nm wavelength of Ar+ laser.At the same time,the absorption coefficient of arteries is obviously lower than that of veins and the scattering coefficient is much higher than that of veins.Although total optical intensities I(x),forward scattering flux i(x),backward scattering flux j(x) are functions of thickness of rabbit arteries and veins respectively,there are obvious difference between arteries and veins.
The diffuse reflectance and transmittance of rabbit arteries and veins are studied with the help of Ar+ laser.The measurements are performed with two standard integrating sphere systems.Based on Kubelka Munk model and experiments,the absorption coefficient,scattering coefficient and the changes of total optical intensities I(x),forward scattering flux i(x),backward scattering flux j(x) as a function of thickness of rabbit arteries and veins have been evaluated and analyzed.Measurement results show that there is significant difference of reflectance and transmittance between arteries and veins at 488.0nm wavelength of Ar+ laser.At the same time,the absorption coefficient of arteries is obviously lower than that of veins and the scattering coefficient is much higher than that of veins.Although total optical intensities I(x),forward scattering flux i(x),backward scattering flux j(x) are functions of thickness of rabbit arteries and veins respectively,there are obvious difference between arteries and veins.
2001, 25(6): 464-466.
Abstract:
Theoretical and experimental studies have been done on laser active imaging radar.A laser scanning imaging demonsttration system has been established.On the basis of radar distance equation,maximum operation distance is calculated.On the experimental setup,a figure picture with 10 frames per second,32 rows per frame is obtained.The quality of the picture is very high.
Theoretical and experimental studies have been done on laser active imaging radar.A laser scanning imaging demonsttration system has been established.On the basis of radar distance equation,maximum operation distance is calculated.On the experimental setup,a figure picture with 10 frames per second,32 rows per frame is obtained.The quality of the picture is very high.
2001, 25(6): 467-469.
Abstract:
A method of laser beam rapid scanning is introduced.Based on the galvanometer scanner produced by General Scanning Incorporation,a two dimension scanning system is realized with an even pixel array of 32×32,10 frames per second.
A method of laser beam rapid scanning is introduced.Based on the galvanometer scanner produced by General Scanning Incorporation,a two dimension scanning system is realized with an even pixel array of 32×32,10 frames per second.
2001, 25(6): 469-472.
Abstract:
A method of non contact and real-time measurement for XeF2 pressure in the XeF laser cell is provided in this paper.The absorption cross section of XeF2 at wavelength of 253.7nm σ253.27XeF=(1.55±0.05)×10-19cm2 is obtained.Using the same measurement system,the suitable laser tube materials is choosed and the relations between laser output energy and the pressure of XeF2 are presented.
A method of non contact and real-time measurement for XeF2 pressure in the XeF laser cell is provided in this paper.The absorption cross section of XeF2 at wavelength of 253.7nm σ253.27XeF=(1.55±0.05)×10-19cm2 is obtained.Using the same measurement system,the suitable laser tube materials is choosed and the relations between laser output energy and the pressure of XeF2 are presented.
2001, 25(6): 473-477.
Abstract:
In order to study the gain medium,Nd:YVO4,pumped continuously by LD,Cr4+:YAG saturable absorbers and intro-cavity doubling KTP crystal are used in a passive Q-switched green laser. Based on the rate equation of the fore level system and numerical simulation,the relationship of the system parameters and the characteristics of the laser beam are analyzed.The theoretical results conform to the experimental results.It is useful to optimize and select the parameters of such systems.
In order to study the gain medium,Nd:YVO4,pumped continuously by LD,Cr4+:YAG saturable absorbers and intro-cavity doubling KTP crystal are used in a passive Q-switched green laser. Based on the rate equation of the fore level system and numerical simulation,the relationship of the system parameters and the characteristics of the laser beam are analyzed.The theoretical results conform to the experimental results.It is useful to optimize and select the parameters of such systems.
2001, 25(6): 477-480.
Abstract:
Based on the multiplex holography with rotating prism and one step rainbow holography,a multiplex one-step rainbow holography,a multiplex one-step rainbow holography with r otat ing prism is presented. Its principle is discussed in detail.It is possible to record many rainbow holograms by rotating prism and multiple exposure way with ordinary He-Ne laser on single holographic plate,and reconstruct with white light at the same time.The experimental results conform to theoretical analysis.
Based on the multiplex holography with rotating prism and one step rainbow holography,a multiplex one-step rainbow holography,a multiplex one-step rainbow holography with r otat ing prism is presented. Its principle is discussed in detail.It is possible to record many rainbow holograms by rotating prism and multiple exposure way with ordinary He-Ne laser on single holographic plate,and reconstruct with white light at the same time.The experimental results conform to theoretical analysis.
