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RSS1997 Vol. 21, No. 4
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[Abstract]
1997, 21(4): 196-199.
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Abstract:
By using the pulse-sequence model and the slab model that the active medium is divided into a series of thin slabs with certain gain distribution and loss factor,the propagation properties of laser beams with arbitrary spatial and temporal profiles passing through multistage and multipass pulsed-laser amplifiers with arbitrary gain distribution have been studied in detail.
By using the pulse-sequence model and the slab model that the active medium is divided into a series of thin slabs with certain gain distribution and loss factor,the propagation properties of laser beams with arbitrary spatial and temporal profiles passing through multistage and multipass pulsed-laser amplifiers with arbitrary gain distribution have been studied in detail.
1997, 21(4): 200-203.
Abstract:
We have investigated the repetitive pulse laser properties of lanthanum neodymium magnesium hexaaluminate(LNA)single crystal.86.6W average output power were obtained with slope efficiency of 2.5%,where a LNA crystal rod with 6mm diameter ×116mm long was pumped by flashlamp at high repetition condition.
We have investigated the repetitive pulse laser properties of lanthanum neodymium magnesium hexaaluminate(LNA)single crystal.86.6W average output power were obtained with slope efficiency of 2.5%,where a LNA crystal rod with 6mm diameter ×116mm long was pumped by flashlamp at high repetition condition.
1997, 21(4): 203-205.
Abstract:
This paper introduces the design model of resonator for HF-excited TF-CO2 laser to provide the 1.5kW industrial applications.Here the three folded resonator structure is employed.According to the design,a experimental system is built to provide TEM00 and TEM01 mode with high power output over 1.5kW,and 1.63 mrad divergence angle,M2=1.70.
This paper introduces the design model of resonator for HF-excited TF-CO2 laser to provide the 1.5kW industrial applications.Here the three folded resonator structure is employed.According to the design,a experimental system is built to provide TEM00 and TEM01 mode with high power output over 1.5kW,and 1.63 mrad divergence angle,M2=1.70.
1997, 21(4): 206-210.
Abstract:
Numerical calculations have been performed to describe the propagation of super-Gaussian(SG)beams and the changes in the intensity(amplitude)distribution and phase behavior.The condition has been discussed,under which SG beams preservet heir shape and order,while passing through paraxial optical systems.
Numerical calculations have been performed to describe the propagation of super-Gaussian(SG)beams and the changes in the intensity(amplitude)distribution and phase behavior.The condition has been discussed,under which SG beams preservet heir shape and order,while passing through paraxial optical systems.
1997, 21(4): 210-214.
Abstract:
We solve the heat conduction equation with semi-infinite boundary condition and present a mathematical model to emulate the relationship of the technical parameters ω(beam radius),ν(scanning speed)and P(laser power)of phase transformation processing to depth and width of the hardened region.The comparisons of emulation with tested results show that the average relative errors of width and depth of hardened region are 3.7% and 18.7%,respectively.This results are meaningful for better selection of technical parameter.
We solve the heat conduction equation with semi-infinite boundary condition and present a mathematical model to emulate the relationship of the technical parameters ω(beam radius),ν(scanning speed)and P(laser power)of phase transformation processing to depth and width of the hardened region.The comparisons of emulation with tested results show that the average relative errors of width and depth of hardened region are 3.7% and 18.7%,respectively.This results are meaningful for better selection of technical parameter.
1997, 21(4): 215-218.
Abstract:
The Nd-Fe-B is a wide employed permanent magnet material.As a example,it is used in watch step motor and the laser drilling is utilized.This paper discuss the effects of laser parameters on the temperature distribution and microstructure of the material surface.
The Nd-Fe-B is a wide employed permanent magnet material.As a example,it is used in watch step motor and the laser drilling is utilized.This paper discuss the effects of laser parameters on the temperature distribution and microstructure of the material surface.
1997, 21(4): 218-222.
Abstract:
This paper reports that temperature distribution profiles in forward stagnation and wake region of CH4/AIR counter flow diffusion flame have been measured by USED CARS.The pyrolysis zone of CH4 is observed at the side with rich CH4 in the stagnation region.The flame temperature in wake region is higher than that in stagnation region.This means there are intermediate products that did not burned completely in the stagnation region.It is proved by emission spectra of C2 and CH4 in wake region,too.
This paper reports that temperature distribution profiles in forward stagnation and wake region of CH4/AIR counter flow diffusion flame have been measured by USED CARS.The pyrolysis zone of CH4 is observed at the side with rich CH4 in the stagnation region.The flame temperature in wake region is higher than that in stagnation region.This means there are intermediate products that did not burned completely in the stagnation region.It is proved by emission spectra of C2 and CH4 in wake region,too.
1997, 21(4): 223-226.
Abstract:
Since the first ruby laser had been employed in ophthalmology,with the rapidly develo ping of laser technology and appearance of novel laser,the study of the laser eye effects has been getting to be wide and depth.And the lasers are wide used in eye medicine.The aim of the article is to summarize the advance about laser eye effects and laser eye medicine and to deal with the laser ocular damage thresholds, laser flashblind,accident ocular laser burn cases,laser eye effect basic studies and laser applications in ophthalmology.
Since the first ruby laser had been employed in ophthalmology,with the rapidly develo ping of laser technology and appearance of novel laser,the study of the laser eye effects has been getting to be wide and depth.And the lasers are wide used in eye medicine.The aim of the article is to summarize the advance about laser eye effects and laser eye medicine and to deal with the laser ocular damage thresholds, laser flashblind,accident ocular laser burn cases,laser eye effect basic studies and laser applications in ophthalmology.
1997, 21(4): 227-230.
Abstract:
In this paper,starting from triangle expressions of complex parameters and Fresnel number of Gaussian beam,the method of complex fraction linear transformation is employed to derive the similar geometrical optics formula of Gaussian beam' complex parameter transformation.The conceptions of conjugation,exchange and inverse evolve point pair are used to explain the transformation properties of Gaussian beam.
In this paper,starting from triangle expressions of complex parameters and Fresnel number of Gaussian beam,the method of complex fraction linear transformation is employed to derive the similar geometrical optics formula of Gaussian beam' complex parameter transformation.The conceptions of conjugation,exchange and inverse evolve point pair are used to explain the transformation properties of Gaussian beam.
1997, 21(4): 231-236.
Abstract:
In this paper,the development of laser light scattering technique applied in blood cells' classification and counting in recent years is reviewed.Methods of multiangle light scattering,light scattering curve,ratio of light scattering intensities,multidirection light scattering and right angle scattering are introduced and evaluated,respectively.The theoretical light scattering models of blood cells are discussed.Finally,the problems to be solved and the research directions are pointed out.
In this paper,the development of laser light scattering technique applied in blood cells' classification and counting in recent years is reviewed.Methods of multiangle light scattering,light scattering curve,ratio of light scattering intensities,multidirection light scattering and right angle scattering are introduced and evaluated,respectively.The theoretical light scattering models of blood cells are discussed.Finally,the problems to be solved and the research directions are pointed out.
1997, 21(4): 236-239.
Abstract:
This paper describes the animal experiment and clinical application of different kinds of lasers affecting respectively deferent duct or testis.It showed that laser could produce a series of biological effects and achieve male birth control.And the result was reliable and the operation was simple.Thus the author considers that vas deferens,if irradiated with argon-laser which is conducted by the optical fibre,will be coagulated by the fibre spots,which can’t influence the peripheral tissues of vas deferens and such side-effects as adhesion and oedema will greatly decrease.
This paper describes the animal experiment and clinical application of different kinds of lasers affecting respectively deferent duct or testis.It showed that laser could produce a series of biological effects and achieve male birth control.And the result was reliable and the operation was simple.Thus the author considers that vas deferens,if irradiated with argon-laser which is conducted by the optical fibre,will be coagulated by the fibre spots,which can’t influence the peripheral tissues of vas deferens and such side-effects as adhesion and oedema will greatly decrease.
1997, 21(4): 240-243.
Abstract:
We discussed some optical properties of the scattering glass ceramics window sintered with composition of BaO-TiO2-SiO2 system.The material can be used as a window of laser power meter.With the scattering feature of the window,it can reduce the polarization error,increase the damage threshold and expand the opto-electrical response range up to 1～2 order of degree.
We discussed some optical properties of the scattering glass ceramics window sintered with composition of BaO-TiO2-SiO2 system.The material can be used as a window of laser power meter.With the scattering feature of the window,it can reduce the polarization error,increase the damage threshold and expand the opto-electrical response range up to 1～2 order of degree.
1997, 21(4): 243-245.
Abstract:
The laser cladding is a useful technique.But the application of laser cladding suffers from the serious defects of holes,crack and etc.This paper introduces the vacuum laser cladding and shows a vacuum laser cladding chamber.Comparison with air laser cladding(ALC),the width and depth of the clad layer in vacuum laser cladding is smaller,and the microstructure of the cladding layer is obviously better.
The laser cladding is a useful technique.But the application of laser cladding suffers from the serious defects of holes,crack and etc.This paper introduces the vacuum laser cladding and shows a vacuum laser cladding chamber.Comparison with air laser cladding(ALC),the width and depth of the clad layer in vacuum laser cladding is smaller,and the microstructure of the cladding layer is obviously better.
1997, 21(4): 246-251.
Abstract:
In the paper,the necessity,task,requirement,recent progress of laser protection are comprehensively discussed.
In the paper,the necessity,task,requirement,recent progress of laser protection are comprehensively discussed.
1997, 21(4): 251-254.
Abstract:
Starting from the point of the advantages and recent progress of laser-diode pumped Nd:YAG laser(DPL),this paper summarizes the fundamental principles and various structures of DPL recently developed.
Starting from the point of the advantages and recent progress of laser-diode pumped Nd:YAG laser(DPL),this paper summarizes the fundamental principles and various structures of DPL recently developed.
1997, 21(4): 255-256.
Abstract:
This paper presents the experimental results of the discharge waveform and energy deposition properties of a 100W XeCl excimer laser.According to these measured data,the energy coupling efficiency of the laser is about 40%.
This paper presents the experimental results of the discharge waveform and energy deposition properties of a 100W XeCl excimer laser.According to these measured data,the energy coupling efficiency of the laser is about 40%.
