Map
WeChat
Email alert
RSS1994 Vol. 18, No. 2
Display Method:
1994, 18(2): 65-68.
[Abstract]
[PDF 212KB]
Abstract:
Problems on semiconductor laser are discussed.The advantages of solid laser pumped by diodes are summarized. Some major recent development in laser crystal materials pumped by diodes are reviewed.
Problems on semiconductor laser are discussed.The advantages of solid laser pumped by diodes are summarized. Some major recent development in laser crystal materials pumped by diodes are reviewed.
1994, 18(2): 69-73.
Abstract:
This paper introduce the various methods of realizing the laser protection by employing nonlinear optics principles, which have been developed recent years.The advantages of these new methods and disadvantages of the conventional linear optics methods for laser protection are analyzed. The developing tendeiicy of laser protection technology is alsodiscussed and set the basic demands on the nonlinear optical materials for laser protection mirrors.
This paper introduce the various methods of realizing the laser protection by employing nonlinear optics principles, which have been developed recent years.The advantages of these new methods and disadvantages of the conventional linear optics methods for laser protection are analyzed. The developing tendeiicy of laser protection technology is alsodiscussed and set the basic demands on the nonlinear optical materials for laser protection mirrors.
1994, 18(2): 74-77.
Abstract:
In this paper,a RF transversally excited CO2 laser with a planar wave-guide unstable resonator is presented. The size of the waveguide is 1.5mm×30mm×400mm. The output power of the laser is 133W,the opto-electronic conversion efficiency is 11% and the output beam of the near-diffraction-limited divergence has been obtained.
In this paper,a RF transversally excited CO2 laser with a planar wave-guide unstable resonator is presented. The size of the waveguide is 1.5mm×30mm×400mm. The output power of the laser is 133W,the opto-electronic conversion efficiency is 11% and the output beam of the near-diffraction-limited divergence has been obtained.
1994, 18(2): 77-81.
Abstract:
By means of lidar measurement of near-ground atmosphere and transmittance iteration method,a formula about the atmosphere extinction coefficient is established.This method is original and easy to apply.
By means of lidar measurement of near-ground atmosphere and transmittance iteration method,a formula about the atmosphere extinction coefficient is established.This method is original and easy to apply.
1994, 18(2): 82-85.
Abstract:
A kind of anti-reflective coating has been theoretically and experimentally studied,which may be applied to high power CO2 lasers.
A kind of anti-reflective coating has been theoretically and experimentally studied,which may be applied to high power CO2 lasers.
1994, 18(2): 86-91.
Abstract:
This paper presents the beam mode,some methods for evaluating beam quality. As put forward by International Organization for Standardization, here the method to use beam propagation factor M for evaluating beam quality has been discussed. The influences of laser beam quality and the thermal effect of lens on the laser welding,cutting and laser processing are also described.
This paper presents the beam mode,some methods for evaluating beam quality. As put forward by International Organization for Standardization, here the method to use beam propagation factor M for evaluating beam quality has been discussed. The influences of laser beam quality and the thermal effect of lens on the laser welding,cutting and laser processing are also described.
1994, 18(2): 92-94.
Abstract:
This paper addresses that no determinate mode exists in phase conjtigate resonator under the approximation condition of weak Gaussian aperture. Only if the un-weak Gaussian aperture is in front of a phase conjtlgate mirror or in the resonator,the phase conjugate resonators have determinate operation mode.
This paper addresses that no determinate mode exists in phase conjtigate resonator under the approximation condition of weak Gaussian aperture. Only if the un-weak Gaussian aperture is in front of a phase conjtlgate mirror or in the resonator,the phase conjugate resonators have determinate operation mode.
1994, 18(2): 95-98.
Abstract:
In this paper,the output power of second harmonic versus the focus length of the lens and the position of extracavity frequency doubling crystal has been investigated by using a KTP crystal in 1.0795 μm TEM00 mode Nd:YAP laser. The experimental results show that here are a optimum focusing and a optimum positioil of the crystal to obtain the maximum output power of the second harmonic.
In this paper,the output power of second harmonic versus the focus length of the lens and the position of extracavity frequency doubling crystal has been investigated by using a KTP crystal in 1.0795 μm TEM00 mode Nd:YAP laser. The experimental results show that here are a optimum focusing and a optimum positioil of the crystal to obtain the maximum output power of the second harmonic.
1994, 18(2): 99-105.
Abstract:
The relation between spatial-temporal characteristic of atmospheric perturbation and several parameters of adaptive optics system is analysed in this paper.Some altitude-distribution models of atmospheric turbulence intensity and wind velocity are presented. According to these medels the atmospheric coherence length,the coherence time and the isoplanatic angle are calculated. The internal errors of an adaptive optics system are discussed. The typical value of each error is indicated. The Strehl ratio of the system is considered in last.
The relation between spatial-temporal characteristic of atmospheric perturbation and several parameters of adaptive optics system is analysed in this paper.Some altitude-distribution models of atmospheric turbulence intensity and wind velocity are presented. According to these medels the atmospheric coherence length,the coherence time and the isoplanatic angle are calculated. The internal errors of an adaptive optics system are discussed. The typical value of each error is indicated. The Strehl ratio of the system is considered in last.
1994, 18(2): 106-109.
Abstract:
On the basis of the theory of holographic interferometry and fracture mechanics, the transveres strain at the tip of crack typeⅠ is studied. With the holograph of the strain field of crack tip,the strain curves are quantitatively analyzed,and the results are basically in agreement with the data obtained by fracture mechanics.
On the basis of the theory of holographic interferometry and fracture mechanics, the transveres strain at the tip of crack typeⅠ is studied. With the holograph of the strain field of crack tip,the strain curves are quantitatively analyzed,and the results are basically in agreement with the data obtained by fracture mechanics.
1994, 18(2): 110-113.
Abstract:
This paper presents the experimental research of smelting-cladding WC-TiC-SiC-Co on 20# steel surface by using a high power CO2 laser.The physic phases analysis of the treated cladding layer are made. A scanning electronic microscope is used to observe the microstructure at the different scanning speed, and the hardness and anti-abrasion are tested. The formation mechanism of the laser smelting-cladding layer is discussed.The experimental results indicate that the WC-TiC-SiC-Co cladding layer on low carbon steel surface greatly improves the mechanical performance of the steel surface.
This paper presents the experimental research of smelting-cladding WC-TiC-SiC-Co on 20# steel surface by using a high power CO2 laser.The physic phases analysis of the treated cladding layer are made. A scanning electronic microscope is used to observe the microstructure at the different scanning speed, and the hardness and anti-abrasion are tested. The formation mechanism of the laser smelting-cladding layer is discussed.The experimental results indicate that the WC-TiC-SiC-Co cladding layer on low carbon steel surface greatly improves the mechanical performance of the steel surface.
1994, 18(2): 114-118.
Abstract:
To improve the surface performance,a 2.5kW CO2 CW laser has been used to modify the surface microstructure of low carbon steel.The surface microstruc-ture depends upon the processing parameters. By using a scanning microscope to observe the surface wear behaviour,it is found that laser radiation and rapid solidification can greatly improve the surface microstructure and increase surface hardness and anti-abrasion.
To improve the surface performance,a 2.5kW CO2 CW laser has been used to modify the surface microstructure of low carbon steel.The surface microstruc-ture depends upon the processing parameters. By using a scanning microscope to observe the surface wear behaviour,it is found that laser radiation and rapid solidification can greatly improve the surface microstructure and increase surface hardness and anti-abrasion.
1994, 18(2): 119-122.
Abstract:
In this paper,the experimental study of laser smelting WC-TiN-Co alloy cladded on the 45# steel surface by using a high power CO2 laser is presented. The surface features, such as phase structure, phase morphology, hardness,antiabra-tiveness,are analyzed. The experimental results show that there are the cardinal changes of the chemical composition and the microstructure of treated 45# steel surface,and the hardness and antiabrativeness of the surface are greatly improved.
In this paper,the experimental study of laser smelting WC-TiN-Co alloy cladded on the 45# steel surface by using a high power CO2 laser is presented. The surface features, such as phase structure, phase morphology, hardness,antiabra-tiveness,are analyzed. The experimental results show that there are the cardinal changes of the chemical composition and the microstructure of treated 45# steel surface,and the hardness and antiabrativeness of the surface are greatly improved.
1994, 18(2): 123-128.
Abstract:
Based on the study of the dynamic process of excited states and relaxation of KrF molecular laser medium composed of Ar,Kr and F2, under the condition of excited with electronic beam,the pumping rates and the fluorescent spectrums have been obtained.
Based on the study of the dynamic process of excited states and relaxation of KrF molecular laser medium composed of Ar,Kr and F2, under the condition of excited with electronic beam,the pumping rates and the fluorescent spectrums have been obtained.
