Journals >Chinese Journal of Lasers
Contents
1993
Volume: 20 Issue 12
14 Article(s)
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Research Article
Testing optical phase object by Moire deflectometry
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper the principal formulae of phase object testing by Moire deflectometry are inferred from geometric and Fourier optics, and practical testing of an axially symmetrical flame temperature distribution is performed with its experimental results processed by the proposed formulae.In this paper the principal formulae of phase object testing by Moire deflectometry are inferred from geometric and Fourier optics, and practical testing of an axially symmetrical flame temperature distribution is performed with its experimental results processed by the proposed formulae..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 91 (1993)
Exact structure determination of Mo/Si soft X-ray multilayer by small angle difraction
[in Chinese], [in Chinese], and [in Chinese]
The structrue of a periodic Mo/Si soft X-ray multilayer is determined through analyses of its small angle diffraction curve and then a numerical curve fitting process. Normal incident reflectance is calculated to be nearly 10% around wavelength 20 nm.The structrue of a periodic Mo/Si soft X-ray multilayer is determined through analyses of its small angle diffraction curve and then a numerical curve fitting process. Normal incident reflectance is calculated to be nearly 10% around wavelength 20 nm..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 900 (1993)
A research on large-scale no-guide distance measurement using external-cavity semiconductor laser
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A research was made on large-scale no-guide distance measurement by using a plane mirror type of external-cavity semiconductor laser and FMCW ranging technique. Some fundamental experiments over 10 m range have been done, which showed the feasibility of this method.A research was made on large-scale no-guide distance measurement by using a plane mirror type of external-cavity semiconductor laser and FMCW ranging technique. Some fundamental experiments over 10 m range have been done, which showed the feasibility of this method..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 906 (1993)
Investigation on porous silica anti-reflective coatings with high laser damage threshold
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
We report herein about the investigation on porous silica coatings prepared from colloidal silica solution on optical glasses and KDP crystal substrates. Measurements show that the coatings are of execellent optical perfomance, high laser damage threshold and broad bandwidth anti-reflection.We report herein about the investigation on porous silica coatings prepared from colloidal silica solution on optical glasses and KDP crystal substrates. Measurements show that the coatings are of execellent optical perfomance, high laser damage threshold and broad bandwidth anti-reflection..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 916 (1993)
Fast classification and counting of surface defects and evaluation of surface performances for optical disks
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, we describe a new method for fast direct classification and counting of the surf ce defects in optical disks and substrates, and present the correspounding experimental results of the surface performance evaluation by this method. Defect signals are obtained with an auto- focusing laser beam scanning theIn this paper, we describe a new method for fast direct classification and counting of the surf ce defects in optical disks and substrates, and present the correspounding experimental results of the surface performance evaluation by this method. Defect signals are obtained with an auto- focusing laser beam scanning the surface of optical disk or substrate, and they are directly classified and counted by the electronic circuits. The number of all kinds of defects and the size are transfered into the micro-computer, then the defect density of optical disk or substrate are calculated by the measuring software, so that the surface performances of optical disks or substrates are effectively evaluated..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 921 (1993)
Calculation of the optical characteristics of mode index lens
[in Chinese], and [in Chinese]
Based on the traditional geometric optics principles and the method of ray tracking, this paper reports the calculation of the aberration of the mode index lens (MIL) when the collimated beam incidents upon it inclinely with an angle, and the divergency of the output beam from the MIL when it works as a collimator for Based on the traditional geometric optics principles and the method of ray tracking, this paper reports the calculation of the aberration of the mode index lens (MIL) when the collimated beam incidents upon it inclinely with an angle, and the divergency of the output beam from the MIL when it works as a collimator for the end-butt coupling between the semiconductor laser and the waveguide. The results demonstrate that as a collimator and converging lens in the integrated-optic spectrum analyzer (IOSA) the MIL is suitable..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 931 (1993)
Laser Manufacturing
Experimental research on laser welding of 1 mm steel sheet
[in Chinese]
Good results are obtained in welding 0.8～1.0 mm galvanized and low-carbon steel sheet with laser. The tensile property of the welded sheet surpassed that of the base material. The average value of cupping test is 87% of the base material.Good results are obtained in welding 0.8～1.0 mm galvanized and low-carbon steel sheet with laser. The tensile property of the welded sheet surpassed that of the base material. The average value of cupping test is 87% of the base material..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 936 (1993)
Influence of scanning speeds on microstructure and properties of laser cladding WC-B4C-Co
[in Chinese], [in Chinese], and [in Chinese]
This article presents our experiments of WC-B4C-Co cladding treatment on 20# steel surface by means of a high power CO2 laser. After treating with different scanning speeds, the microstructure and performances of the clad layer are observed, examined and analyzed. The experimental results show the obvious influence of This article presents our experiments of WC-B4C-Co cladding treatment on 20# steel surface by means of a high power CO2 laser. After treating with different scanning speeds, the microstructure and performances of the clad layer are observed, examined and analyzed. The experimental results show the obvious influence of the scanning speeds on the microstructure and properties of the laser cladding..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 940 (1993)
Laser Physics
Analyse of cavity structure and choice of dye concentration for CPM unstable resonator Nd:YAG laser
[in Chinese], and [in Chinese]
The cavity structure of a colliding pulse mode locked Nd:YAG laser, which has an unstable resonator with a convex mirror and antiresonator ring, is analysed. The cavity length and dye concentration on the influence of output characteristics is investigated. Thus, we have obtained the best operating condition and experiThe cavity structure of a colliding pulse mode locked Nd:YAG laser, which has an unstable resonator with a convex mirror and antiresonator ring, is analysed. The cavity length and dye concentration on the influence of output characteristics is investigated. Thus, we have obtained the best operating condition and experimental results..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 881 (1993)
Technique of CVL pulse broadening and influence of broadened pulse on amplification efficiency
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A set of practical pulse broadening system with the total broadening efficiency of 60% is given in the paper. When broadened pulse injects the amplifier of CVL, its amplification efficiency increases 10%～20%. The waveforms of amplified laser are also given at the different delays and their variation priciple is analyseA set of practical pulse broadening system with the total broadening efficiency of 60% is given in the paper. When broadened pulse injects the amplifier of CVL, its amplification efficiency increases 10%～20%. The waveforms of amplified laser are also given at the different delays and their variation priciple is analysed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 885 (1993)
Investigation on the optimum gain condition for the green line of He-Ne laser
[in Chinese], [in Chinese], and [in Chinese]
The dependences of the small gain coefficient for He-Ne 543 nm laser line on the total gas pressure, discharge current and pressure ratio of Helium to Neon have been investigated respectively. The optimum values of the three parameters were obtained.The dependences of the small gain coefficient for He-Ne 543 nm laser line on the total gas pressure, discharge current and pressure ratio of Helium to Neon have been investigated respectively. The optimum values of the three parameters were obtained..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 889 (1993)
Research of structure and technology for multi-wavelength He-Ne laser
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Five laser lines corresponding to the vavelengths: 633 nm, 612 nm, 604 nm, 594 nm and 543 nm have been obtained respectively from a one meter discharged He-Ne laser with an external wide band refletor and half prism wavelength selector. The research presents an experiment basis of designing an all internal cavity greenFive laser lines corresponding to the vavelengths: 633 nm, 612 nm, 604 nm, 594 nm and 543 nm have been obtained respectively from a one meter discharged He-Ne laser with an external wide band refletor and half prism wavelength selector. The research presents an experiment basis of designing an all internal cavity green He-Ne laser..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 892 (1993)
Optimizing design of variable metal mesh coupler for the HCN laser
[in Chinese], [in Chinese], and [in Chinese]
In this paper, a kind of laser interference filter with two metal mesh reflector grids has been investigated. By adjusting the spacing between the two parallel grids, the reflectance of the transmittance can be varied. It is shown by theoretical analysis that the transmittance with two different grids is better for theIn this paper, a kind of laser interference filter with two metal mesh reflector grids has been investigated. By adjusting the spacing between the two parallel grids, the reflectance of the transmittance can be varied. It is shown by theoretical analysis that the transmittance with two different grids is better for the HCN laser than that with same grids. By optimizing calculation a set of grid parameters has been obtained..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 896 (1993)
Materials and Thin Films
Relationship between absorption spectrum of ionic platinum and density N of platinum particles in N21 phosphate laser glass
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
From the absorption spectrum of Pt+4 and Pt+2 we found the correlation among λmax, S/H in Pt ionic absorption band and platinum inclusion density N. Relations between oxygen partial pressure and oxido-reduction balance in equilibrum equation Pt4+ Pt2+ Pt0 are also explained. The rules of removing platinum inclusion areFrom the absorption spectrum of Pt+4 and Pt+2 we found the correlation among λmax, S/H in Pt ionic absorption band and platinum inclusion density N. Relations between oxygen partial pressure and oxido-reduction balance in equilibrum equation Pt4+ Pt2+ Pt0 are also explained. The rules of removing platinum inclusion are presented..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 12, 926 (1993)
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