Journals >Chinese Journal of Lasers
Contents
1994
Volume: 21 Issue 6
17 Article(s)
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Research Article
Mesurement of Frequency-doubled Energy from "Sheng Guang" facility
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Technical parameters of calorimeter for monitoring frequency- doubled laser energy are given. The calorimeter is used to measure the frequency-doubled laser enersy and its conversion efficiency in the "Sheng Guang" facility and the calibrated methods for the calorimeter are also discussed.Technical parameters of calorimeter for monitoring frequency- doubled laser energy are given. The calorimeter is used to measure the frequency-doubled laser enersy and its conversion efficiency in the "Sheng Guang" facility and the calibrated methods for the calorimeter are also discussed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 453 (1994)
Analyses of the structure and Interfaces of Multilayer UsingHigh-resolution Transmission Electron Microscopy
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The structure of a Mo/Si multilayer fabricated with planiar magnetron sputtering has been inveStigated by using SAXD and HRTEM techniques. The FC-digital image processing syStem, which can easily give us the digital results of the structure parameters of multilayer, has been induced in analyses of HRTEM.The structure of a Mo/Si multilayer fabricated with planiar magnetron sputtering has been inveStigated by using SAXD and HRTEM techniques. The FC-digital image processing syStem, which can easily give us the digital results of the structure parameters of multilayer, has been induced in analyses of HRTEM..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 457 (1994)
Laser Diode Active Interferomoter with the Strong Abnity of EliminatingEnvironmental Disturbance by Using Sinusoidally Modulation
[in Chinese]
The peper describe the operation principle of laser diode active intorferometor that with the sttong ability of eliminating enwtonmental disturbance by using sinusoidally syncronired differential modulation. The ability of eliminating environmenatal disturbance of thiskind of interferometer is raised by more than 50% cThe peper describe the operation principle of laser diode active intorferometor that with the sttong ability of eliminating enwtonmental disturbance by using sinusoidally syncronired differential modulation. The ability of eliminating environmenatal disturbance of thiskind of interferometer is raised by more than 50% compered with interferometer that with nomodulation..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 463 (1994)
Speckel-fields Emitted from Multimode Fiber-optic Boundle and Their Applications
[in Chinese]
In this paper, we study the properties of speckle fields emitted multimode fiber-optic boundle under illumination of the He-Ne laser light. The difference among the speckle-fields emitted by the multimode fiber-optic boundles, which consist of fibers of different cope diameters, is discussed, and compared with the specIn this paper, we study the properties of speckle fields emitted multimode fiber-optic boundle under illumination of the He-Ne laser light. The difference among the speckle-fields emitted by the multimode fiber-optic boundles, which consist of fibers of different cope diameters, is discussed, and compared with the speckle-field of frosted glass. The rightness of conclusions has been verified by the experiments, and the field can be used in optical measurement and information processing..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 469 (1994)
Pyroelectric Energy Meter with mp Sensitivity and FastRedponse for Millimeter Wave Laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Basing on pyroclectric theory, a novel millimeter wave ther enetgy detectot with high sensitivity and fast response has been proposed and designed. We calibrated it at different operating frequencies separately. Its main propetty Parameters have been given. Sensitivity of this energy meter is about several ten mV/μJ, wBasing on pyroclectric theory, a novel millimeter wave ther enetgy detectot with high sensitivity and fast response has been proposed and designed. We calibrated it at different operating frequencies separately. Its main propetty Parameters have been given. Sensitivity of this energy meter is about several ten mV/μJ, which is four to five orders higher thsn traditional detector. Its time response is less than 1 μs. The speed of response has been improved by six to seven orders. This energy meter has been used in detective system of Raman free-electron laser. We successfully measured the typical parameters of the output millimeter wave laser pulse..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 473 (1994)
Stability of Periodic Resonators
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, the stability of Periodic resonators is analysed. It is found that the m-rod N- Period resonator has m stable zones and in each stable zone there are N-1 sinsular points in which the resonators is critical stable and sensitive to the deviations. The thermo-stable conditions of Periodic resonators is alsoIn this paper, the stability of Periodic resonators is analysed. It is found that the m-rod N- Period resonator has m stable zones and in each stable zone there are N-1 sinsular points in which the resonators is critical stable and sensitive to the deviations. The thermo-stable conditions of Periodic resonators is also discussed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 479 (1994)
Holography and Information Processing
Automated Image Processing for Analysis of Carrier Cided Fringe Pattern
[in Chinese], and [in Chinese]
A novel algorithm of image processing for the analysis of carrier fringe pattern is proposed. Only one fringe Pattern that is carrier ceded is need for extracting unambiguous information. The coded fringe pattern is first FFF filtered to get an initial phase with carrier phase in it. Several times of phase shift iteratA novel algorithm of image processing for the analysis of carrier fringe pattern is proposed. Only one fringe Pattern that is carrier ceded is need for extracting unambiguous information. The coded fringe pattern is first FFF filtered to get an initial phase with carrier phase in it. Several times of phase shift iteration are carried out to improve the phase. Then the carrier is removed by subtracting the pure barrier phase from the cede phase. The algorithm offer higher precision over the FFT-transform technique in literature..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 499 (1994)
The Characterhation of a FLC Light Valve with Pixellated Metal Reflector
[in Chinese], and [in Chinese]
The characterization of a ferroelectric liquid crystal light valve has been performed. To evaluale the FLCLV,a new set of parameters such aS read-out efficiency, effeCtive gain and spatial uniformity was introduced. The experimental results are given in derail. The clock effect of the FLCLV on the reading and writing oThe characterization of a ferroelectric liquid crystal light valve has been performed. To evaluale the FLCLV,a new set of parameters such aS read-out efficiency, effeCtive gain and spatial uniformity was introduced. The experimental results are given in derail. The clock effect of the FLCLV on the reading and writing operation are discussed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 504 (1994)
Laser Manufacturing
Study of the Proton-exchanged LiTaO3Waveguide in Benzonic Acid and Its Annealing Property
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The fabricating method and the annealing properties of the ptoton-exchanged LiTaO3 waveguide are reported in this Paper. The refractive index Profiles of the waveguide layer before and atter annealing are given, and the surface refractive index increment and the diffusion coefficients are caculated. It is show that theThe fabricating method and the annealing properties of the ptoton-exchanged LiTaO3 waveguide are reported in this Paper. The refractive index Profiles of the waveguide layer before and atter annealing are given, and the surface refractive index increment and the diffusion coefficients are caculated. It is show that the refractive index increment of the waveguide correlates with the ratio between the annealing time and the exchanging time..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 517 (1994)
Pulsed CO2Laser Assisted Synthesis of Nanometer SiC Ceramic Powder
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Nanometer SiC ceramic powder has been produced by TEA CO2 laser induced SiH4+CH4 plasma chemical reaction. Powder character and property have ben studied through FTIR spectroscopy, X-ray diffraction, elements analysis and transmution electron microscopy technique. In addition, the gas-phase reaction process was discussNanometer SiC ceramic powder has been produced by TEA CO2 laser induced SiH4+CH4 plasma chemical reaction. Powder character and property have ben studied through FTIR spectroscopy, X-ray diffraction, elements analysis and transmution electron microscopy technique. In addition, the gas-phase reaction process was discussed with the result of optical emission spetroscopy..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 522 (1994)
Laser Cladding of Moving Blades in the Lower Pressure-last Stage of Steam Turbines
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
To protect the water erosion a cobat base alloy coating has been cladded on the leading edge of the moving blabes in the lower pressure-last sarge of steam turbines by a 2 kW CO2 laser, and the blades have been put intO trial operaton in a electric power plant. This paper introduces the technology and the equipment on To protect the water erosion a cobat base alloy coating has been cladded on the leading edge of the moving blabes in the lower pressure-last sarge of steam turbines by a 2 kW CO2 laser, and the blades have been put intO trial operaton in a electric power plant. This paper introduces the technology and the equipment on laser cladding processing of bledes and discusses the experimental results. The results indicate that it is possible to use the laser cladding technique for Production of moving bledes..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 526 (1994)
Influence of Laser Irradiation on Collagenous Fibers and Elastic Fibers in the Skin of Guinea Pig
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The skin changes of the guinea pig under laser irradiation were observed. It is found that the collagen fibers are swelled, the periodic transverse striation can nat in distrinction, and the elastic fibers in dermis at the irradiated sites are thickened, curled, and fragmented. These results might be induced by the theThe skin changes of the guinea pig under laser irradiation were observed. It is found that the collagen fibers are swelled, the periodic transverse striation can nat in distrinction, and the elastic fibers in dermis at the irradiated sites are thickened, curled, and fragmented. These results might be induced by the thermoeffect of laser..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 530 (1994)
Laser Physics
UV Stimulated Emission Generated by the Resonant Excitationof the Strong FWM Signal in the Atoms
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Via two-hphoton resonant excitation of sodium atom (3S→4D) in Na-Na2 mixture by the laser at 578.7 nm, more than forty stimulated emission lines in the UV 320-370 nm region were obtuinted. Passing labeling and analysing, it has been demonstrated that the UV stimulated emiSSion lines are come from in Na2, which was exciVia two-hphoton resonant excitation of sodium atom (3S→4D) in Na-Na2 mixture by the laser at 578.7 nm, more than forty stimulated emission lines in the UV 320-370 nm region were obtuinted. Passing labeling and analysing, it has been demonstrated that the UV stimulated emiSSion lines are come from in Na2, which was excited by the FWM wave in Na as the consequent pumping source of the assemble..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 484 (1994)
Soliton-effect Generation of Raman Pulses in Optical Fibers with Slowly Decreasing Dispenion
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A mathematical model is obtained for the description of ultrafast stimulated Raman scattehog in optical fibers with slowly decreasing dispersion. Numerical simulations show that, under identical pump conditinns, Raman pulse generated from this kind of fibers is shorter with a higher ark power than that generated from cA mathematical model is obtained for the description of ultrafast stimulated Raman scattehog in optical fibers with slowly decreasing dispersion. Numerical simulations show that, under identical pump conditinns, Raman pulse generated from this kind of fibers is shorter with a higher ark power than that generated from conventional fibers. This means that the Raman threShold of fibers with slowly decreasing dispersion may be lower than that of conventional fibers. Given pump conditions, we found that the highest peak power and narrowest width of the Raman pulse correspond to an optimal decrement velocity of the fiber dispersion..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 489 (1994)
The Variation of Radiation Distribution Caused by Plasmas Interactions
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper investigatny the charaCteristics of the spatial distribution of laser plasma X-ray (LPX) formed by irradtatins a plasma with X-ray emitted from another plasma. The results show the influence of plasma emissions and the spatial geometty of the two interacting plasmas on the total PLX'radiation fields. In This paper investigatny the charaCteristics of the spatial distribution of laser plasma X-ray (LPX) formed by irradtatins a plasma with X-ray emitted from another plasma. The results show the influence of plasma emissions and the spatial geometty of the two interacting plasmas on the total PLX'radiation fields. In addition, the poper also indicated the X-ray enhsncement, the extremely nonunifotm distribution of the election density, and the plasma jet structure in the interaction region..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 495 (1994)
Materials and Thin Films
3-Methyl-4-Methoxy-4′-Nitrostilbene (MMONS ) Crystal Growth and Studier of its Second Nonlinear Optical Properties
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Studies on organic nonlinear optical materials is one of the interesting fields of functional materials. Furthermore, MMONS is such a mat6rial that it has the highest powder SHG efficiency to data. In this Paper, the crystal growth and studies of its second这nonlinear optical Properties were reported.Studies on organic nonlinear optical materials is one of the interesting fields of functional materials. Furthermore, MMONS is such a mat6rial that it has the highest powder SHG efficiency to data. In this Paper, the crystal growth and studies of its second这nonlinear optical Properties were reported..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 509 (1994)
Study on Spetral Properties of Na5Tm(WO4)4Luminescence Crystal
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The novel luminescence crystal, Na5Tm(WO4)4, has been grown from Na2WO4 melt. The single crystals as large as 2 mm×2 mm×2 mm were obtained. According to formula of crystal planes space of the tetragonal system and calculation of regtession analysis, the lattice parameters of Na5Tm(WO4)4 crystal were measured.The novel luminescence crystal, Na5Tm(WO4)4, has been grown from Na2WO4 melt. The single crystals as large as 2 mm×2 mm×2 mm were obtained. According to formula of crystal planes space of the tetragonal system and calculation of regtession analysis, the lattice parameters of Na5Tm(WO4)4 crystal were measured. Their values are a=1.1386 nm, c=1.1283 nm,c/a=0.991. In this Paper, the aborption, fluorescence, excitation and infrared spectra of such crystal at room temperature were measured and analysed at the same time, according to Judd-ofelt theory the intensity parameters, oscillator strengths of Tm3+ ion were measured. From these results it is noted that the Na5Tm(WO4)4 crystal is a important luminescence material at blue spectral range..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 512 (1994)
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