Contents
1991
Volume: 11 Issue 9
20 Article(s)
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Holography
Experimental study of optical parallel cache memory arrays
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The array of optical cache memory and the array of random access memory are very important devices for digital optical processor. A simple system of optical cache memory array is proposed in this paper, which consists of two 2-D optical bistable devices. They are used for memory block and switch element respectively. TThe array of optical cache memory and the array of random access memory are very important devices for digital optical processor. A simple system of optical cache memory array is proposed in this paper, which consists of two 2-D optical bistable devices. They are used for memory block and switch element respectively. The experiment scheme is discussed in detail. The whole process of random latch in and taking out for optical signal array is implemented experimentally..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 790 (1991)
All optical matrix multiplacation using photorefractive LiNbO3:Fe crystal
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
We have studied the matrix-vector and matrix-matrix multiplication using four-wave mixing in LiNbO3:Fe crystal. The response time of the device is in the order of a few seconds. The intensities representing the elements of matrices can be lower than 100μW/mm2. "We have also discussed two photorefraotive effects thWe have studied the matrix-vector and matrix-matrix multiplication using four-wave mixing in LiNbO3:Fe crystal. The response time of the device is in the order of a few seconds. The intensities representing the elements of matrices can be lower than 100μW/mm2. "We have also discussed two photorefraotive effects that affect the accuracy of multiplication..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 794 (1991)
IPA memory with Fresnel hologram
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The IPA (Inter-pattern Association) memory is set up with Fresnel Hologram. Compared with Hopfield Model, it is of better storage capacity and higher reoogniza-tion ability even for the patterns which are similar to each other. The interconnection of patterns with large pixel number is implemented in this system becausThe IPA (Inter-pattern Association) memory is set up with Fresnel Hologram. Compared with Hopfield Model, it is of better storage capacity and higher reoogniza-tion ability even for the patterns which are similar to each other. The interconnection of patterns with large pixel number is implemented in this system because of using hologram..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 801 (1991)
Amplification properties of high speed amplitudemodulated beams in photorefractive crystal
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The amplification properties of high speed amplitude modulated beams in photo-refractive crystal are theoretic allyanalysed. The experimetal results in Ce: SBN crystal are given. The physical mechanism is discussed. The results indicate that two-beam coupling in photorefractive crystal can be applied in the encode commThe amplification properties of high speed amplitude modulated beams in photo-refractive crystal are theoretic allyanalysed. The experimetal results in Ce: SBN crystal are given. The physical mechanism is discussed. The results indicate that two-beam coupling in photorefractive crystal can be applied in the encode communication..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 805 (1991)
Photorefractive Bi12SiO20spatial light modulator
[in Chinese], [in Chinese], and [in Chinese]
We used home-made photorefractive crystd Bi12SiO20 as realtime nondegenerate and degenerate four-wave mixing medium, to acoomplish incoherent to coherent conversion, wavelength conversion, image subtraction between coherent and incoherent image. The experimental results are given in this paper.We used home-made photorefractive crystd Bi12SiO20 as realtime nondegenerate and degenerate four-wave mixing medium, to acoomplish incoherent to coherent conversion, wavelength conversion, image subtraction between coherent and incoherent image. The experimental results are given in this paper..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 810 (1991)
Materials
In situ measurements of lattice constants changes corresponding to different dislocation density ranges in KAP (n, -n) double crystals diffraction
[in Chinese], [in Chinese], and [in Chinese]
In situ measurements of the relative changes in the lattice constants of KAP corresponding to the different dislocation density ranges has been earried out by means of (n,-n) double crystal diffract)metry. The (n, -n) double crystal reflection of the (001) plane with Cuka radiation shows that the relative change in latIn situ measurements of the relative changes in the lattice constants of KAP corresponding to the different dislocation density ranges has been earried out by means of (n,-n) double crystal diffract)metry. The (n, -n) double crystal reflection of the (001) plane with Cuka radiation shows that the relative change in lattice constants due to dislocations are in the range of 3.8～19.2×10-4nm..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 821 (1991)
Expressions of thermal refractive index coefficients for Nd3+:YAlO3crystal
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The expressions of thermal refractive index coefficients for Nd:YAlO3 (Nd: YAP) crystal have been achieved and used to calculate thermal refractive index coefficients of Nd:YAP crystal at different wavelength. The calculated values is found being in good agreement with the experimental values.The expressions of thermal refractive index coefficients for Nd:YAlO3 (Nd: YAP) crystal have been achieved and used to calculate thermal refractive index coefficients of Nd:YAP crystal at different wavelength. The calculated values is found being in good agreement with the experimental values..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 825 (1991)
Optical Devices
Cylinder lenses array line focus system for X-ray laser experiments
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A novel laser line focus system using a lens and a parallel cylinder lens array can produce an uniform energy distribution line focus. Irradiation of the plane targets with high power laser line focus in various experiments. X-ray laser gain and excellent performance have been obtained.A novel laser line focus system using a lens and a parallel cylinder lens array can produce an uniform energy distribution line focus. Irradiation of the plane targets with high power laser line focus in various experiments. X-ray laser gain and excellent performance have been obtained..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 829 (1991)
Application of holographic phase grating in the laser heterodyne detection system of detector array
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper presents detector array and holographic phase grating experimental results and analysises for feasible application in CO2 laser heterodyne detection systems. It provides an important basis for their practicability.This paper presents detector array and holographic phase grating experimental results and analysises for feasible application in CO2 laser heterodyne detection systems. It provides an important basis for their practicability..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 834 (1991)
Rapid Communications
Single transverse mode narrow bandwidth pulsed tunable dye laser with hollow circular dielectric waveguide
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper presents a novel widely tunable, pulsed dye laser with single transverse mode narrow bandwidth which can be constructed by using a grazing-inoidenoe grating in eonjustion with a hollow circular dielectric waveguide. The experimental results show that the single transverse mode narrow bandwidth laser output cThis paper presents a novel widely tunable, pulsed dye laser with single transverse mode narrow bandwidth which can be constructed by using a grazing-inoidenoe grating in eonjustion with a hollow circular dielectric waveguide. The experimental results show that the single transverse mode narrow bandwidth laser output can be obtained while maintaining a high lasing efficiency. The mechanism of the improvement is also discussed in this paper..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 844 (1991)
Theoretical Calculation of Energy Levels and Soft X-ray Spectra for Na-like ions from Copper to molybdenum
[in Chinese], [in Chinese], and [in Chinese]
The energy levels of Na-like ions from Copper to Molybdenum are reported. The transition wavelengths of 5g-4f, 5f-4d, 6g-4f, 6f-4d are given as well as the oscillator strengths. These transitions are of potential interest for X-ray laser. The results indicate that the 6f-4d transition of Se ions, the 6g-4f transition oThe energy levels of Na-like ions from Copper to Molybdenum are reported. The transition wavelengths of 5g-4f, 5f-4d, 6g-4f, 6f-4d are given as well as the oscillator strengths. These transitions are of potential interest for X-ray laser. The results indicate that the 6f-4d transition of Se ions, the 6g-4f transition of Br ions, the 5f-4d transition of Zr ions, the 5g-4f transition of Nb ions are all in the range of the "Water "Window"..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 848 (1991)
The VUV spectrum of five-time ionized titanium TiVI
[in Chinese], and [in Chinese]
The spectrum of five-time ionized titanium emitted from a three-electrode vacuum spark has been observed using a 1-m normal incidence speotrograph. We have observed 157 new lines of TiVI in the region from 24 to 200nm. According to the newly identified lines of TiVI we have found 11 new enegy levels and revised 5 doubtThe spectrum of five-time ionized titanium emitted from a three-electrode vacuum spark has been observed using a 1-m normal incidence speotrograph. We have observed 157 new lines of TiVI in the region from 24 to 200nm. According to the newly identified lines of TiVI we have found 11 new enegy levels and revised 5 doubtful energy level valuse..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 853 (1991)
Making of hard alloy WC-TiC-Co and study of its mechanism
[in Chinese], and [in Chinese]
This article presents a method of making hard alloy WC-TiC-Co on the No.45 steel surface by using high power laser beam. The microstructrue and performance of the alloyed layer are observed, examined and analyzed, and the mechanism of forming hard alloy is studied. The results indicate that it is very successful to impThis article presents a method of making hard alloy WC-TiC-Co on the No.45 steel surface by using high power laser beam. The microstructrue and performance of the alloyed layer are observed, examined and analyzed, and the mechanism of forming hard alloy is studied. The results indicate that it is very successful to improve the properties of the metal material's surface with this method..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 858 (1991)
[in Chinese]
[in Chinese], [in Chinese], and [in Chinese]
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 863 (1991)
[in Chinese]
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 864 (1991)
Spectroscopy
Study of dynamical behavior in two-step optical resonant ionization
[in Chinese], and [in Chinese]
By means of coupled density matrix and maxwell equations, we investigate the physical mechanism of two-step optical resonant ionization. Numerical technique is used to analyze the excitation and ionization efficiency affected by the atomic and pulse's parameters. Some optimazation conditions are derived and simultaBy means of coupled density matrix and maxwell equations, we investigate the physical mechanism of two-step optical resonant ionization. Numerical technique is used to analyze the excitation and ionization efficiency affected by the atomic and pulse's parameters. Some optimazation conditions are derived and simultaneous different-wavelength optical solitons (simulton), as one of those conditions, are discussed preliminarilly..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 769 (1991)
Basic parameters and spectroscopic structure of plasma corresponding to Na-like Cu ion X-ray laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Recently our group has succeeded in systematic experiment on X-ray laser in recombining plasma at LF12 facility SIOM. on this base. We measured and analyzed spectroscopio structure corresponding above system and derived basic relation of population inversion, gain parameter with plasma parameters. Meanwhile, it also giRecently our group has succeeded in systematic experiment on X-ray laser in recombining plasma at LF12 facility SIOM. on this base. We measured and analyzed spectroscopio structure corresponding above system and derived basic relation of population inversion, gain parameter with plasma parameters. Meanwhile, it also gives the effect of different laser intensities on plasma parameters and spectroscopic structure..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 776 (1991)
Measurement of Na2fluorescence lifetime by two-photon excitation
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper studies the measuring method of fluorescence lifetime for the high-lying triplet state of Na2. The response function influence on the measuring apparatus has been eliminated effectively by simulating the equifrequent two-photon excitation process with the frequency doubler and numerically calculating the conThis paper studies the measuring method of fluorescence lifetime for the high-lying triplet state of Na2. The response function influence on the measuring apparatus has been eliminated effectively by simulating the equifrequent two-photon excitation process with the frequency doubler and numerically calculating the convolution of the fluorescence decay curve. Then, the fluorescence lifetime of the high-lying triplet state 23Πg-a3 Σu+ in Na2 has been measured..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 781 (1991)
Raman spectroscopy of liquid-core optical fiber
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The method and condition of obtaining optimal raman spectra by means of liquid-core optical fiber are described. Spectral intensity enhancement by factors of 102 to conventional sample techniques has been obtained with the liquid-core optical fiber. The loss ooeffoient in the fiber were calculated by measuring the stokThe method and condition of obtaining optimal raman spectra by means of liquid-core optical fiber are described. Spectral intensity enhancement by factors of 102 to conventional sample techniques has been obtained with the liquid-core optical fiber. The loss ooeffoient in the fiber were calculated by measuring the stokes line intensity..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 786 (1991)
Thin Films
A new method for design of broade band antireflective coatings
[in Chinese], and [in Chinese]
Considering the three-layer antireflection band being not wide enough, a new method to relize the design of broad band antirefleotive multilayer is proposed. Its total thickness is not changed. Using this method, equal-thickness four-layer antireflectivemultilayers have been designed successfully with the last reflectiConsidering the three-layer antireflection band being not wide enough, a new method to relize the design of broad band antirefleotive multilayer is proposed. Its total thickness is not changed. Using this method, equal-thickness four-layer antireflectivemultilayers have been designed successfully with the last reflectivity of less than 0.2%, antirefleotion band-width of 390nm. This paper represents design procedure, definite condition of antirefleotion and several examples of applied design. The result showed that this new method is much better than the classical antireflective mutilayers..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 9, 838 (1991)
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