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RSS2001 Vol. 25, No. 2
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2001, 25(2): 81-84.
[Abstract]
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Abstract:
Based on a modified spectrum of refractive index fluctuation that features inner scale,outer scale and a high wave number bump,and the Gaussian aperture model, analytical expressions and interpolation formulas are obtained for the aperture averaging factor associated with optical scintillation of unbounded plane waves and spherical waves respectively,in weak fluctuation regime.These analyses are inclusion of the finite outer scale,which is necessary for quantitative estimate. The results obtained for the modified model turbulence spectrum significantly differ from those obtained for a Kolmogorov turbulence spectrum.
Based on a modified spectrum of refractive index fluctuation that features inner scale,outer scale and a high wave number bump,and the Gaussian aperture model, analytical expressions and interpolation formulas are obtained for the aperture averaging factor associated with optical scintillation of unbounded plane waves and spherical waves respectively,in weak fluctuation regime.These analyses are inclusion of the finite outer scale,which is necessary for quantitative estimate. The results obtained for the modified model turbulence spectrum significantly differ from those obtained for a Kolmogorov turbulence spectrum.
2001, 25(2): 85-90.
Abstract:
We have recently developed an optical fiber sensor based on beam deflection for detecting shock waves. It successfully measured the changing rate of the refractive index of the transient airborne shock waves produced by plasmas in laser material damage processes. This measurement system, particularly suitable for instantaneous detection of axisymmetrical shock waves, is broadband as well as non contact.
We have recently developed an optical fiber sensor based on beam deflection for detecting shock waves. It successfully measured the changing rate of the refractive index of the transient airborne shock waves produced by plasmas in laser material damage processes. This measurement system, particularly suitable for instantaneous detection of axisymmetrical shock waves, is broadband as well as non contact.
2001, 25(2): 90-94.
Abstract:
A laser miro-beam system for cell manipulation is introduced in the paper.It consists of an optical scalpel,which is a Nd:YAG laser beam focused tightly by an objective and an optical trap,the focused He-Ne laser beam. Not only the overall design of the laser micro-beam system but also the design and the choice of the critical components of the system are reviewed.The optical trap can manipulate cells in suspension, it validates the kinetic performance of the laser trap. The optical scalpel can concise chromosome and punch holes in cells or organelles.
A laser miro-beam system for cell manipulation is introduced in the paper.It consists of an optical scalpel,which is a Nd:YAG laser beam focused tightly by an objective and an optical trap,the focused He-Ne laser beam. Not only the overall design of the laser micro-beam system but also the design and the choice of the critical components of the system are reviewed.The optical trap can manipulate cells in suspension, it validates the kinetic performance of the laser trap. The optical scalpel can concise chromosome and punch holes in cells or organelles.
2001, 25(2): 95-96.
Abstract:
The electro-optic Q-switch technique for 1.54μm Er-glass laser is described.With a single 45° LiNbO3 crystal Q-switched,the output energy is up to 22mJ with pulse width of 72ns.
The electro-optic Q-switch technique for 1.54μm Er-glass laser is described.With a single 45° LiNbO3 crystal Q-switched,the output energy is up to 22mJ with pulse width of 72ns.
2001, 25(2): 97-100.
Abstract:
The principle of SPR(Surface Phasmon Resonance), the energisation condition of SPR phenomenon and the phase variation of the reflected light in SPR are briefly presented.The application of transverse Zeeman laser is also analyzed.The equipment based on transverse Zeeman laser is set up to detect the phase variation in biomolecular interaction and a lot of experiments are made upon the interaction of ricin and its antibody.The experiments show that the optical path of P light coincides with that of S light,which is self-adaptive to the disturbance of the air index or any others and has high stability. The phase detection has higher reliability than the intensity detection, with the precision of laser frequency stability up to 3.5×10-10.Transverse Zeeman laser is the ideal light source of phase detection in biomolecular interaction based on SPR principle.
The principle of SPR(Surface Phasmon Resonance), the energisation condition of SPR phenomenon and the phase variation of the reflected light in SPR are briefly presented.The application of transverse Zeeman laser is also analyzed.The equipment based on transverse Zeeman laser is set up to detect the phase variation in biomolecular interaction and a lot of experiments are made upon the interaction of ricin and its antibody.The experiments show that the optical path of P light coincides with that of S light,which is self-adaptive to the disturbance of the air index or any others and has high stability. The phase detection has higher reliability than the intensity detection, with the precision of laser frequency stability up to 3.5×10-10.Transverse Zeeman laser is the ideal light source of phase detection in biomolecular interaction based on SPR principle.
2001, 25(2): 101-104.
Abstract:
Recently the studies on generation of X-ray laser excited by capillary discharge are quite active and remarkable progress has been made.The development in this field is focused on how to make compact and practical ultra-wavelength laser.In this paper,significant progress is introduced.The development and difficulty about generation of X-ray laser by capillary discharge is expounded,and recombination and laser schemes are analyzed.
Recently the studies on generation of X-ray laser excited by capillary discharge are quite active and remarkable progress has been made.The development in this field is focused on how to make compact and practical ultra-wavelength laser.In this paper,significant progress is introduced.The development and difficulty about generation of X-ray laser by capillary discharge is expounded,and recombination and laser schemes are analyzed.
2001, 25(2): 105-108.
Abstract:
A detecting system for real time study on the damage of optical materials is described.The system is comprised of a Nomarski interferometer and a digital camera.With the system connected with a computer,the detecting and recording process can be automatically realized.Furthermore,the design of former Nomarski interferometer is optimized so that the size of the system is reduced and the detection resolution is improved.
A detecting system for real time study on the damage of optical materials is described.The system is comprised of a Nomarski interferometer and a digital camera.With the system connected with a computer,the detecting and recording process can be automatically realized.Furthermore,the design of former Nomarski interferometer is optimized so that the size of the system is reduced and the detection resolution is improved.
2001, 25(2): 108-111.
Abstract:
In the process of the study on power density distribution of infrared high power laser, it is convenient to acquire laser power density through processing the laser image gradation by computer.The image is obtained via the method of translation slit.The distortion induced by nonuniform motion of the slit in the process of laser power density measurement and its correctiuon is discussed in the paper.
In the process of the study on power density distribution of infrared high power laser, it is convenient to acquire laser power density through processing the laser image gradation by computer.The image is obtained via the method of translation slit.The distortion induced by nonuniform motion of the slit in the process of laser power density measurement and its correctiuon is discussed in the paper.
2001, 25(2): 112-115.
Abstract:
In this paper, a binary optical element is described. The element is made with binary optical technology. It can be used as a spectral element in a computered tomography image formation spectrometer. The element scatters a light beam into a 3×3 light spot array. The intensity distribution, diffraction efficiency and the relationship between diffraction efficiency and wavelength are given. The experimental results tally with the theoretical ones.
In this paper, a binary optical element is described. The element is made with binary optical technology. It can be used as a spectral element in a computered tomography image formation spectrometer. The element scatters a light beam into a 3×3 light spot array. The intensity distribution, diffraction efficiency and the relationship between diffraction efficiency and wavelength are given. The experimental results tally with the theoretical ones.
2001, 25(2): 115-117.
Abstract:
With the help of the semiconductor optical amplifier developed by ourselves,2.5 Gbits/s all optical wavelength conversion based on cross gain modulation is studied.Wavelength up conversion happened in the range of 1549.8nm and 1562.6nm.Influence of modulation format and pumping power on conversion efficiency,extinction ratio and noise characteristics are also studied.The experimental results are illustrated in detail.
With the help of the semiconductor optical amplifier developed by ourselves,2.5 Gbits/s all optical wavelength conversion based on cross gain modulation is studied.Wavelength up conversion happened in the range of 1549.8nm and 1562.6nm.Influence of modulation format and pumping power on conversion efficiency,extinction ratio and noise characteristics are also studied.The experimental results are illustrated in detail.
2001, 25(2): 118-121.
Abstract:
Non-diffracting beams and Moire fringe technology is able to work in short,middle and long distance with high measuring resolution.Based on this phenomenon,a new collimating tracking, positioning laser system is developed.The system is highly immune to light vibration and mechanical vibration with high positioning accuracy of 0.12μm/5m.
Non-diffracting beams and Moire fringe technology is able to work in short,middle and long distance with high measuring resolution.Based on this phenomenon,a new collimating tracking, positioning laser system is developed.The system is highly immune to light vibration and mechanical vibration with high positioning accuracy of 0.12μm/5m.
2001, 25(2): 121-125.
Abstract:
The properties of cosine-Gaussian beams propag ating in free space and propagating through an unapertured thin lens are respectively analyzed and calculated.The closed-form expressions of the diffraction field are obtained by using the general Huygens-Fresnel diffraction integral.Axial intensity and relative focal shift are derived.The calculated results are analyzed and compared.
The properties of cosine-Gaussian beams propag ating in free space and propagating through an unapertured thin lens are respectively analyzed and calculated.The closed-form expressions of the diffraction field are obtained by using the general Huygens-Fresnel diffraction integral.Axial intensity and relative focal shift are derived.The calculated results are analyzed and compared.
2001, 25(2): 126-129.
Abstract:
Scanning technique of CO2 laser imaging radar has become one of the key techniques used in cruise guide and control guide. This paper describes a disc,reflectve,computer-generated hologram grating scanner with scanning range of 10°×2°,resolution of 64 pixels per line, diffractive efficiency of 27.6% It is put forward that the computer-generated hologram grating scanner may become an efficient way to solve the scanning technique of CO2 laser imaging radar with the development of binary optical techniques and the state-of-art of manufacture.
Scanning technique of CO2 laser imaging radar has become one of the key techniques used in cruise guide and control guide. This paper describes a disc,reflectve,computer-generated hologram grating scanner with scanning range of 10°×2°,resolution of 64 pixels per line, diffractive efficiency of 27.6% It is put forward that the computer-generated hologram grating scanner may become an efficient way to solve the scanning technique of CO2 laser imaging radar with the development of binary optical techniques and the state-of-art of manufacture.
2001, 25(2): 129-133.
Abstract:
Laser cladding of Co-base alloy on the nuclear valve-sealing surface has been performed with a 5kW CO2 flow transverse laser.Optical microscope,SEM,and EDAX have been used to analyze the microstructure,the grain size,the micro-hardness,and the dilution rate.The results show that the microstructure,the grain size,the dilution rate,the width of heat-effect area,and the micro-hardness of the laser cladding coating are much better than those of the spurt welding and the bead welding processing.
Laser cladding of Co-base alloy on the nuclear valve-sealing surface has been performed with a 5kW CO2 flow transverse laser.Optical microscope,SEM,and EDAX have been used to analyze the microstructure,the grain size,the micro-hardness,and the dilution rate.The results show that the microstructure,the grain size,the dilution rate,the width of heat-effect area,and the micro-hardness of the laser cladding coating are much better than those of the spurt welding and the bead welding processing.
2001, 25(2): 134-136.
Abstract:
Based on the properties of dental cast,this paper describes a laser scanning system with special two axes.The system has no blind area,it's simple and effective.
Based on the properties of dental cast,this paper describes a laser scanning system with special two axes.The system has no blind area,it's simple and effective.
2001, 25(2): 136-139.
Abstract:
The method of using laser to treat tumour is presented.A medical KTP/YAG laser system has been designed with wavelengths of 1064nm,532nm,1319nm and 660nm.It can be used to treat tumour.
The method of using laser to treat tumour is presented.A medical KTP/YAG laser system has been designed with wavelengths of 1064nm,532nm,1319nm and 660nm.It can be used to treat tumour.
2001, 25(2): 140-143.
Abstract:
The principle and resolution of the laser marker controlled by single chip microcomputer,the hardware and interface program of the single chip microcomputer control system are introducedd in this paper.
The principle and resolution of the laser marker controlled by single chip microcomputer,the hardware and interface program of the single chip microcomputer control system are introducedd in this paper.
2001, 25(2): 143-146.
Abstract:
Based on the propagation equation of flattened Gaussian beams passing through an unapertured optical ABCD system, the propagation properties of flattened Gaussian beams through a lens series have bean analyzed and illustrated with numerical examples.
Based on the propagation equation of flattened Gaussian beams passing through an unapertured optical ABCD system, the propagation properties of flattened Gaussian beams through a lens series have bean analyzed and illustrated with numerical examples.
2001, 25(2): 147-150.
Abstract:
A model of magnetically confined discharge CO laser is presented.Under the condition of magnetically confined discharge,the following factors are analyzed.First,the change of electron energy distribution of discharges system;secondly,the impact excitation rates of electron for the vibrating CO molecules;finally,the dependence of V-V,V-T rates on magnetic field and temperature.It is shown that with magnetic field added,the effect of electric field on electron decreases which decreases the impact excitation rate of electron for the vibration CO molecules in electric field direction and that the effect on V-V, V-T rates is weak.
A model of magnetically confined discharge CO laser is presented.Under the condition of magnetically confined discharge,the following factors are analyzed.First,the change of electron energy distribution of discharges system;secondly,the impact excitation rates of electron for the vibrating CO molecules;finally,the dependence of V-V,V-T rates on magnetic field and temperature.It is shown that with magnetic field added,the effect of electric field on electron decreases which decreases the impact excitation rate of electron for the vibration CO molecules in electric field direction and that the effect on V-V, V-T rates is weak.
2001, 25(2): 150-153.
Abstract:
Based on the general Huygens-Fresnel diffraction integral formula,the focusing property of Gaussian beams through a spherical aberrant lens is studied.Numerical illustrative examples are given.It is shown that if the waist width of the incident Gaussian beams is relatively small,our results reduce to those of references[1] and [2].
Based on the general Huygens-Fresnel diffraction integral formula,the focusing property of Gaussian beams through a spherical aberrant lens is studied.Numerical illustrative examples are given.It is shown that if the waist width of the incident Gaussian beams is relatively small,our results reduce to those of references[1] and [2].
2001, 25(2): 154-157.
Abstract:
This paper gives the CCD image test results. The laser facula measurement error and the test problems are analyzed. Some solutions are presented in the paper.
This paper gives the CCD image test results. The laser facula measurement error and the test problems are analyzed. Some solutions are presented in the paper.
2001, 25(2): 157-161.
Abstract:
This paper briefly describes present state of laser anti-satellite technology at abroad.
This paper briefly describes present state of laser anti-satellite technology at abroad.
