Contents
1986
Volume: 6 Issue 1
16 Article(s)
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Research Article
Lasers and Laser Optics
Experimental study of colliding pulse mode locking of a Nd:YAG laser
LIU YIXIAN, MA HAIMING, SUN DIECHI, and LI FUMING
In this paper, an experimental sot-up of colliding pulse mode locking of a Nd:YAG laser is reported. The effect of various parameters on the characteristics of colliding pulse mode-locking was investigated. Under the optimal condition, the shortest pulse duration of 8 ps was obtained and the stability of output energy In this paper, an experimental sot-up of colliding pulse mode locking of a Nd:YAG laser is reported. The effect of various parameters on the characteristics of colliding pulse mode-locking was investigated. Under the optimal condition, the shortest pulse duration of 8 ps was obtained and the stability of output energy was about ±7%..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 1 (1986)
Optical resonant reflectors and their application in laser technique
ZHU ZHIMING, CHEN SHAOHE, CHEN QINHAO, CAO WEILOU, and DENG XIMING
Reflection spectra of resonant reflectors have been solved on a computer. They can be divided into two types: degenerate and non-degenerate. Line shapes of resonant peaks, modulability of envelopes, characteristics of periodic spectra and two relevant properties are discussed in detail. The single axial mode operation Reflection spectra of resonant reflectors have been solved on a computer. They can be divided into two types: degenerate and non-degenerate. Line shapes of resonant peaks, modulability of envelopes, characteristics of periodic spectra and two relevant properties are discussed in detail. The single axial mode operation in a tuning range of 2A has been obtained with a PZT tuned resonant reflector. This work provides a background for designing resonant reflectors..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 6 (1986)
Materials
Brillouin scattering in LiNbO3 crystals and measurements of elastic and piezoelectric constants
ZHOU WEIQING, and ZHAO MINGZHOU
In addition to pboto-elastic effect, we have also considered rotation and electro-optic effects in calculating Brillouin tensors of LiNbO3 crystals. After careful design and adjustment of the experiment system. Brillouin spectra of LiNbO3 crystals were measured in the 90° scattering scheme. We measured all indepenIn addition to pboto-elastic effect, we have also considered rotation and electro-optic effects in calculating Brillouin tensors of LiNbO3 crystals. After careful design and adjustment of the experiment system. Brillouin spectra of LiNbO3 crystals were measured in the 90° scattering scheme. We measured all independent elastic and piezoelectric constants of LiNbO3 crystals made in China in the hypersonic region. The spatial were also measured in the 180?back scattering scheme. Experimental results are in good agreement with calculations..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 57 (1986)
Photoluminescence investigation of impurities and defects in silicon crystals at low temperature
ZONG XIANGFU, WENG YUMIN, GAO JIANRONG, SHAO LING, and WU XINGKIN
The photoluminescence (PL) technique at liquid helium tempera-ture has been applied to characterization of shallow imparities and thermal defects in silicon crystals. A number of PL spectra of B-doped and P-doped Sj with different doping levels have been obtained together with quantitative analysis. A concentration of The photoluminescence (PL) technique at liquid helium tempera-ture has been applied to characterization of shallow imparities and thermal defects in silicon crystals. A number of PL spectra of B-doped and P-doped Sj with different doping levels have been obtained together with quantitative analysis. A concentration of boron as low as 5×1011 cm-3 in highly pure Si could be detected. The dependence of PL intensity on excitation intensity was investigated. We have also applied the PL technique in the analysis ....
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 63 (1986)
OPTOELECTRONICS
Electron-beam interference and Fresnel diffraction
CHEN JIANWEN, FU SHUFEN, NI RUILLAN, WANG ZHIJIANG, and CAO HANQING
Experimental results of electron interference and Fresnel diffraction observed on a transmission electron microscope using an electrostatic biprism as beam-splliter are reported.Experimental results of electron interference and Fresnel diffraction observed on a transmission electron microscope using an electrostatic biprism as beam-splliter are reported..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 23 (1986)
Physical Optics
Exact analytic solutions of high-order Gaussian beam modes in media with quadratic radial refractive index and gain profiles
ZHANG RUILIN
The exact analytic and steady-state solutions are derived for high-order Gaussian beam propagation modes in media with quadratic radial refractive index and gain (loss) profiles based on the slowly varying envelope approximation (SVEA). Explicit expressions of the solutions are given for some useful specific cases. PosThe exact analytic and steady-state solutions are derived for high-order Gaussian beam propagation modes in media with quadratic radial refractive index and gain (loss) profiles based on the slowly varying envelope approximation (SVEA). Explicit expressions of the solutions are given for some useful specific cases. Possible applications of the present theory to optical cavities and waveguides with such media and to problems of optical bistability in cavities having media with quadratic radial index and absorption profile are discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 34 (1986)
Propagation characteristics of guided modes on fiber-core spliced section and application to monomode fiber directional coupler
FANG XISHENG, MAO ZHONGMING, and LI BINHONG
The first-order perturbation theory is used to analyse the propagation characteristics of guided modes on fiber-core spliced section. The results are applied to determine the theoretical coupling amount of monomode optical fiber directional coupler with strong transverse coupling by means of the mode excitation theory.The first-order perturbation theory is used to analyse the propagation characteristics of guided modes on fiber-core spliced section. The results are applied to determine the theoretical coupling amount of monomode optical fiber directional coupler with strong transverse coupling by means of the mode excitation theory. Our theoretical results are in good agreement with the experimental measurements..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 42 (1986)
Effects of central dip in refractive index on propagation characteristics of W-type single-mode fibers
JIANG MINGJUN, and LIN ZHITUAN
Effects of central dip in refractive index on the normalized cut-off frequency, normalized propagation constant, dispersion and power distribution of W-type single-mode fibers have been studied in detail.For typical W-type single-mode fibers, propagation characteristics will not show significant changes provided the wiEffects of central dip in refractive index on the normalized cut-off frequency, normalized propagation constant, dispersion and power distribution of W-type single-mode fibers have been studied in detail.For typical W-type single-mode fibers, propagation characteristics will not show significant changes provided the width and depth of the central dip are less than 50%..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 49 (1986)
Rapid Communications
Three-mode laser action in an inhomogeneously broadened medium
LI XIAOSHEN, and ZHU SHIYAO
Lamb s quantum theory of lasers is extended to deal with the three-mode laser operation in an in homogeneously broadened solid medium consisting of four-level atoms. The master equation, the operation characteristics and the line-width of the three-mode laser are obtained and discussed. The relevant experimental resultLamb s quantum theory of lasers is extended to deal with the three-mode laser operation in an in homogeneously broadened solid medium consisting of four-level atoms. The master equation, the operation characteristics and the line-width of the three-mode laser are obtained and discussed. The relevant experimental result is explained and effects of inhomogeneous broadening are studied..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 76 (1986)
Spectral and lasing characteristics of PBD series of UV laser dyes
SHAO ZIWEN, YUE CHUANHUA, PAN JIAXING, ZHOU YIMIN, and GAO ZHENHENG
This paper describes the characteristics of six laser dyes of PBD series which are compounds of 2-phenyl- and five of 2-(p- or m- substitued phenyl)-5-(4 -biphenyl-yl oxadiazoles. Two of them are new compounds that were synthesized by Nankai University. The ultraviolet absorption spectra, fluorescence spectra and fluorThis paper describes the characteristics of six laser dyes of PBD series which are compounds of 2-phenyl- and five of 2-(p- or m- substitued phenyl)-5-(4 -biphenyl-yl oxadiazoles. Two of them are new compounds that were synthesized by Nankai University. The ultraviolet absorption spectra, fluorescence spectra and fluorescence quantum yields of such dyes are given. Tuning curves of PBD dye lasers pumped by a nitrogen laser are measured, and the tunable spectral regions are found to be of 356 to 393 nm. The laser conversion efficiencies of all the six PBD dyes reported here are higher than those of existing laser dyes of PPO and BPBD. The PBD series dyes are suitable to be pumped by either N2 laser (377nm) or XeGl excimer laser (308nm)..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 82 (1986)
Space-domain filtering for computer generated hologram
Lu DA, Wu MINXIAN, and CHIN KUOFAN
Reducing carrying frequencies in computer generated holograms ia very important in constructing the graphs. We propose a new off-axis filtering method in the space domain, which is suitable for wavefronts with quadric term. In some cases, by using this method the carrying frequency can be reduced to about 1/3 of that uReducing carrying frequencies in computer generated holograms ia very important in constructing the graphs. We propose a new off-axis filtering method in the space domain, which is suitable for wavefronts with quadric term. In some cases, by using this method the carrying frequency can be reduced to about 1/3 of that used in conventional frequency domain filtering. Two sets of preliminary experimental results are shown..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 87 (1986)
Shearing interferometric testing of an astronomical telescope with aperture of 1.56m
XU DEYAN
The principle and method of shearing interferometric testing of the major mirror of an astronomical telescope with aperture of 1.56m are described in this paper. Measurement results with 1/4 PV are obtained.The principle and method of shearing interferometric testing of the major mirror of an astronomical telescope with aperture of 1.56m are described in this paper. Measurement results with 1/4 PV are obtained..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 93 (1986)
Spectroscopy
Stimulated emission based on two-step hybrid resonance via A1∑u or B1Ⅱu state of Na2
QIN LIJUAN, WANG ZUGENG, ZHANG KECHANG, and ZHONG YISHAN
Stimulated emission based on two-step hybrid resonance via A1∑u or B1∏u state of Na2 has been observed by using a broad-band and a narrow-band dye laser as pumping sources. The maclunism is discussed.Stimulated emission based on two-step hybrid resonance via A1∑u or B1∏u state of Na2 has been observed by using a broad-band and a narrow-band dye laser as pumping sources. The maclunism is discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 12 (1986)
Population inversion between Ar+ 4p and 4s levels in HCD of pure argon
LI SHIFANG, HU QIQUAN, YIN LIFENG, and LIN FUCHENG
Population inversion between Ar+ 4p and 4s levels was detected in the direct current hollow cathode discharge (HOD) of pure argon by laser-induced fluorescence measurement. Experimental data were obtained and analysed.Population inversion between Ar+ 4p and 4s levels was detected in the direct current hollow cathode discharge (HOD) of pure argon by laser-induced fluorescence measurement. Experimental data were obtained and analysed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 17 (1986)
Thin Films
Measurement and analysis of properties of films doped with oxides
CHEN YUMING, TANG JINFA, and GU PEIFU
In this paper some techniques for measuring stress, absorption, scattering and other properties of thin films are described. The properties of some oxides and films doped withoxides are measured by using these techniques. Auger electron spectroscopy and X-ray diffraction technique are employed to analyse chemical compoIn this paper some techniques for measuring stress, absorption, scattering and other properties of thin films are described. The properties of some oxides and films doped withoxides are measured by using these techniques. Auger electron spectroscopy and X-ray diffraction technique are employed to analyse chemical compositions and crystal structures of films. Some useful results have been obtained..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 6, Issue 1, 70 (1986)
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