Contents
1989
Volume: 9 Issue 7
18 Article(s)
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Research Article
Holography
Optical elerctic hybrid associative menory model with threshold modification using complementary vector
BIAN SHAOPING, XU KEBIN, and HONG JING
A new kind of criterion for evaluating the degree of the similarity between two vectors in associative menorizing is proposed and accordingly, an experiment about the optical electric hybrid associative memory model with threshold modification using complementary vector is designed and implemented. This model is capablA new kind of criterion for evaluating the degree of the similarity between two vectors in associative menorizing is proposed and accordingly, an experiment about the optical electric hybrid associative memory model with threshold modification using complementary vector is designed and implemented. This model is capable of control-eling the accuracy to retrieve vector and eliminating the possibility to read out erroneously..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 618 (1989)
Imaging and processing techniques of X-ray coded aperture
Hu JIASHHNG, DONG TIZHI, ZHAO BAOQING, and GAO QINGPENG
The basic principle of coded aperture imaging is described in this paper. Some methods of coded aperture and making of camera are discussed, with emphasis on the coded aperture technique of uniformly redundant array (URA). Investigative results of optical and digital processing on coded aperture image are presented. FiThe basic principle of coded aperture imaging is described in this paper. Some methods of coded aperture and making of camera are discussed, with emphasis on the coded aperture technique of uniformly redundant array (URA). Investigative results of optical and digital processing on coded aperture image are presented. Finally, the experimental results and the examples of practical applications are given..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 623 (1989)
Lasers and Laser Optics
Study on optical klystron
WANG MINGCHANG, WANG ZHIJIONG, V. L. GBANATSTEIN, and B. LEVUSH
An optical klystron confi uration at millimeter wavelengths has been investigated to improve gain and efficiency of the free electron laser. A computer simulation code has been developed, and it can be applied to design an optical klystron device. For a small period wiggler case with a sheet electron beam at 300 keV anAn optical klystron confi uration at millimeter wavelengths has been investigated to improve gain and efficiency of the free electron laser. A computer simulation code has been developed, and it can be applied to design an optical klystron device. For a small period wiggler case with a sheet electron beam at 300 keV and A and a wiggler period of 3.7mm operating at 300 GHz, 27.9 dB gain and 0.5% efficiency have been calculated. With a beam at 450keV and a wiggler period of 1cm operating at 160 GHz, 32 dB gain and 2.7% effecincy hive bsen cajoulabed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 608 (1989)
Nonlinear Optics
A self-pumped phase conjugate mirror (SPPCM) with BaTiO_3
ZHANG ZHIGUO, WANG DADI, YU QUNLI, GANG HU, ZHANG SHIMING, and YE PEIXIAN
In this paper, we report for the first time the a aelfpumped phase conjugate mirror (SPPCM) with reflectance of more than 30 % has been made using photorefrao-tive crystal BaTiO3 grown in China. An experiment to recover a distorted image has been performed successfully using this mirror. Both the built-up process of thIn this paper, we report for the first time the a aelfpumped phase conjugate mirror (SPPCM) with reflectance of more than 30 % has been made using photorefrao-tive crystal BaTiO3 grown in China. An experiment to recover a distorted image has been performed successfully using this mirror. Both the built-up process of the self-pumped phase conjugate signal, which depands on the intensity of the incident beam, and the angle between the incident beam and the crystal axis and the erasure rate of the SPPOM have been measured. We report also for tho first time a device whioh. can generate bwo or more refleobed phase conjugate signala simultaneously for two or more incident beams respectively nsing only one SPPOM..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 598 (1989)
Nonlinear enhancement effect of absorbed layers of photosynthetic pigment molecules
LI QUN, WANG WENYAO, ZHANG ZHENG, QIU PEIHUA, and YU SHIGUI
Laser beam at λ=1.06 μm was used as fundamental wave to irradiate on the adsorbed layers of the photosynthetic pigment molecules (baoteriochlorophyll and phycocyanin) on the optical surface. The harmonic generation is observed. It is discussed that the adsorbed layer of phyoooyanin can generate only third harmonic (THGLaser beam at λ=1.06 μm was used as fundamental wave to irradiate on the adsorbed layers of the photosynthetic pigment molecules (baoteriochlorophyll and phycocyanin) on the optical surface. The harmonic generation is observed. It is discussed that the adsorbed layer of phyoooyanin can generate only third harmonic (THG) not second harmonic (SHG)..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 603 (1989)
Physical Optics
Analogue calculation for propagution of ultrashort optical pulse in fiber
ZHANG RUOBING, ZHANG LIYUAN, and WANG QINYUE
A simple computer algorithm for propagution of ultraghort optical pulse in optical fiber is presented in this paper. Frequency modulation, spectrum broadening and square pulse pulse shaping are obtained for optical fiber with positive dispersion and the propagation of soliton wibh N = 1, 2 and 3 is obtained for a fibe A simple computer algorithm for propagution of ultraghort optical pulse in optical fiber is presented in this paper. Frequency modulation, spectrum broadening and square pulse pulse shaping are obtained for optical fiber with positive dispersion and the propagation of soliton wibh N = 1, 2 and 3 is obtained for a fibe with negative dispersion. The calculated results with this algorithm are well in agreement with that calculated by nonlinear Schrodinger equation..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 646 (1989)
Rapid Communications
A method of measuring the modulation of refractive index of phase holographic recording medium
YUN GANG, and Yu MEIWEN
A method of measuring the modulation of refractive index of a certain holographic recording medium is presented in this paper, for the purpose of more appropriately evaluating different recording mediums and different fabrication techniques.A method of measuring the modulation of refractive index of a certain holographic recording medium is presented in this paper, for the purpose of more appropriately evaluating different recording mediums and different fabrication techniques..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 653 (1989)
ESR study of photolytic process in six laser dyes under action of UV irradiation
FU WENBIAO, WU ZHENGLIANG, and Zhao Jinming
The property of photolysis for six kinds of laser dye-ethanol medium was studied by EST technique. Free radicals and triplet state was measured at 77 K. Finally the experimental results were discussed.The property of photolysis for six kinds of laser dye-ethanol medium was studied by EST technique. Free radicals and triplet state was measured at 77 K. Finally the experimental results were discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 658 (1989)
The property of light polarization in single multimcde optrcal fiber and its effect on the image transmitted using phase cojagaticn
LIN DAN, YANG GUOGUANG, GU TIANQU, HE CHONGFAN, LI XUEMEI, and TANG YUANFENG
The polarization property of the light beam carrying an image while passing through a multimode step-index optical fiber and its effect on the quality of the image tnransmission by phase conjugation are studied in this paper. The method of filtering the noise is suggested. With this method, main part of the noise can bThe polarization property of the light beam carrying an image while passing through a multimode step-index optical fiber and its effect on the quality of the image tnransmission by phase conjugation are studied in this paper. The method of filtering the noise is suggested. With this method, main part of the noise can be reduced and the image quality can be improved. Both the theoretiial analysis and esperimentat results are given, and a transmitted image with a resolution of 40 line/mm is obtained..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 662 (1989)
0.86μm laser two-dimension-scanning imaging experimental research
WANG WEIRAN, CHEN WEIYONG, LIU HONGZNAN, and PENG LIADG
In this paper, a set of images with 0.86μm laser two dimension scanning imaging and the block diagram of imaging experimental system were presented- the range equation of the lager imaging system and the measured data of retorre, flectanoe oontrait for several different matters were given also in the paper.In this paper, a set of images with 0.86μm laser two dimension scanning imaging and the block diagram of imaging experimental system were presented- the range equation of the lager imaging system and the measured data of retorre, flectanoe oontrait for several different matters were given also in the paper..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 667 (1989)
An automated method for 360 ° surface measurement of 3-D objects
SU XIANYU, CHEN XIAOXIE, and GUO LUROXG
A new method for obtaining a complete 360° reconstruction of a general 3-D object is presented. The principle, system construction, data acquisition and processing schedule, and exparimental results are described briefly.A new method for obtaining a complete 360° reconstruction of a general 3-D object is presented. The principle, system construction, data acquisition and processing schedule, and exparimental results are described briefly..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 670 (1989)
Spectroscopy
Investigation on absorption spectra of aggregates of MOC dye monolayers
ZHANG WEIQING, LIANG PEIHUI, and ALEXANDER MULLER
Absorption spectra of aggregates of dye Langmuir-Blodgett films were investigated in different conditions. The typical aggregate of dye MOC (1-methyl-l -octadecyl-2,2 -cyaninpereh-lorate) appears an absorption band (J band) peaking at near 580 nm with absorbanoe of 0.09. The temporal effect of a new sample shows that iAbsorption spectra of aggregates of dye Langmuir-Blodgett films were investigated in different conditions. The typical aggregate of dye MOC (1-methyl-l -octadecyl-2,2 -cyaninpereh-lorate) appears an absorption band (J band) peaking at near 580 nm with absorbanoe of 0.09. The temporal effect of a new sample shows that it takes about 2 hours for the aggregates to be stable. Several parameters of J band of samples were measured, such as absorption peak position, absorbanoe and the width of band, as well as the temperature dependences of their parameters. The inyertibl? variation of the absorbanoe versus temperature in a physioal basic for the aggregate LB layer to "be used in optical storage. When the sample was heated at temperature over 100 ℃ the thermal invertibility of absorption broke down indicating a phase change..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 577 (1989)
LIF spectrum of Q-branch (J′=105) and changing ratio of electronic dipole transition moment of C1Ⅱu-X1∑9+ for dimer 39K2
ZHANG LIMIN, WEI JILIN, and XIA YUXING
The laser-inducea fluorescence (LIF) spectrum of Q-branch of C1∏u(v =0, J = 105)- X1∑g+(v"=1-10, J" = 105) for dimer 39K2 excited by 4415.6 A CW He-Cd laser was reported. The vibrational constants of X 1∑g+ and the Te value of C1∏u for 39K2 were obtained by last-square fitting. The spectrum analysis showed thThe laser-inducea fluorescence (LIF) spectrum of Q-branch of C1∏u(v =0, J = 105)- X1∑g+(v"=1-10, J" = 105) for dimer 39K2 excited by 4415.6 A CW He-Cd laser was reported. The vibrational constants of X 1∑g+ and the Te value of C1∏u for 39K2 were obtained by last-square fitting. The spectrum analysis showed that the Te= 22968cm-1 of C1∏u for 39K2 was suitable. The Franck-Condon factors of the (v = 0, J = 105) - (v" = 1-10, J" = 105) transitions for dimer 39K2 were computed by using Morse potentials. The agreement between the computed intensities and the experimental ones was satisfactory. The analysis of r-centroid approximation showed that the changing ratio of the electronic dipole transition moment Be for dimer 39Ka was 0.157~0.168 detye/A(4.22 A
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 585 (1989)
Some characteristics of UV f luoresence from XeO* and XeS*
XU JIE
The characteristics of UV fluorescence from XeO* and XeS* in the reactions of Xe(6p) states with N2O and OCS have been studied. The experimental results indicated that they have short difetime and vibrational relaxation in the high pressure of Ar.The characteristics of UV fluorescence from XeO* and XeS* in the reactions of Xe(6p) states with N2O and OCS have been studied. The experimental results indicated that they have short difetime and vibrational relaxation in the high pressure of Ar..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 591 (1989)
Thin Films
Measurement of bulk and interface absorption in Multilayer coatings
WU ZHOULING, and FAN ZHONGXIU
By an appropriate variation in the thickness of the high and low refracting components, a the bulk and interface absorption of dielectric TiO2/SiO2 multilayer stacks was investigated using transverse photothermal deflection technique. The results are in good agreement with those previously reported using photoacoustio By an appropriate variation in the thickness of the high and low refracting components, a the bulk and interface absorption of dielectric TiO2/SiO2 multilayer stacks was investigated using transverse photothermal deflection technique. The results are in good agreement with those previously reported using photoacoustio method..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 630 (1989)
Determination of interface cross-correlation properties of optical coatings
ZHAN YUANLING, and WANG Li
Measurements have been made of the scattered field distribution of optical films. The interface cross-correlation properties have been determined according to the vector so ttering theory for multilayer optical coatings. In the case of a few layer number, the interfaces in optical films are fully correlated and partialMeasurements have been made of the scattered field distribution of optical films. The interface cross-correlation properties have been determined according to the vector so ttering theory for multilayer optical coatings. In the case of a few layer number, the interfaces in optical films are fully correlated and partially correlated respectively at the lower and higher spatial frequencies of the interface irregularity. It is shown that the interface cross-correlation properties also depend on the vapouring techqiques used..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 635 (1989)
Investigation on the micro-characteristics of TeSeln thin films
FAN ZHENGXIU, and XUE SONGSENG
TeSeIn thin film is a kind of reversible phase change recording medium. Two kinds of TeSeIn thin films were prepared by thermal evaporation and magnebron spu btering methods respectively. Micromorphology and microstruoture of TeSeIn thin film were studied by TEM method. Using AES-PRO analysis, TeSeln thin film compositTeSeIn thin film is a kind of reversible phase change recording medium. Two kinds of TeSeIn thin films were prepared by thermal evaporation and magnebron spu btering methods respectively. Micromorphology and microstruoture of TeSeIn thin film were studied by TEM method. Using AES-PRO analysis, TeSeln thin film composition depth profile given and the diffusion profile of the interface between TeSeIn thin film and ZnS matching layer are given. The chemical shifts of binding energy of inner electron of Te, Se and In element in TeSeIn thin film are given by X PS measurement. A method for preparing multi-tjomponent phase ohange recording thin film with high quality and high stability is discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 9, Issue 7, 640 (1989)
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