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Acta Optica Sinica
Contents
1993
Volume: 13 Issue 8
19 Article(s)
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Fiber Optics and Optical Communications
Preparation and measurement of KTiOPO
4
crystal planar waveguides
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The results of the preparation and measurements of KTiOPO4 crystal planar wave guides are reported in this paper. Its effective refractive indices have been measured by using m -line method. The distribution curves of refractive indices in Z+ and Z- faces, as well as diffusion coefficients have been calculated with WKB
The results of the preparation and measurements of KTiOPO4 crystal planar wave guides are reported in this paper. Its effective refractive indices have been measured by using m -line method. The distribution curves of refractive indices in Z+ and Z- faces, as well as diffusion coefficients have been calculated with WKB approximation. Anomalous point of refrcative idices during ion exchange process was discovered..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 746 (1993)
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Holography
Locally interconnected neural network for associative memory
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Based on the globally interconnected Hopfield model, a new concept of locally interconnected associative memory is proposed in this paper. Compared with the globally interconnected, locally interconnected neural network has a smaller interconnection weight matrix (IWM), therefore, it can be easily implemented with comm
Based on the globally interconnected Hopfield model, a new concept of locally interconnected associative memory is proposed in this paper. Compared with the globally interconnected, locally interconnected neural network has a smaller interconnection weight matrix (IWM), therefore, it can be easily implemented with commercially available spatial light modulators. Moreover, computer simulations indicate that it still possesses the global association ability..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 706 (1993)
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Factors Having influence on the accuracy of multi-aperture overlap-scanning technique (MAOST) and Analysis
[in Chinese], [in Chinese], and [in Chinese]
Multi - aperture overlap - scanning technique (MAOST) is a effective meansof measuring large aperture wavefront of high precision. Having giventhe accuracy definition of MAOST, this paper discusses, withexperimental tests, two main influential factors, i. e. , the apertureconnection mode and overlap coefficient.
Multi - aperture overlap - scanning technique (MAOST) is a effective meansof measuring large aperture wavefront of high precision. Having giventhe accuracy definition of MAOST, this paper discusses, withexperimental tests, two main influential factors, i. e. , the apertureconnection mode and overlap coefficient..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 711 (1993)
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Effect of recording methods on resolution in X-ray holography
[in Chinese], [in Chinese], and [in Chinese]
This paper starts with analysing the two special recording methods of X- ray holography, and considers the effect of the impulse response of recording material and the size of hologram on the resolution of X-ray hologram. The conclusion is that the smallest resolving distance of X-ray lensless Fourier transform hologra
This paper starts with analysing the two special recording methods of X- ray holography, and considers the effect of the impulse response of recording material and the size of hologram on the resolution of X-ray hologram. The conclusion is that the smallest resolving distance of X-ray lensless Fourier transform hologram can not be smaller than radius of the focus spot of the X-ray condenser or the filter aperture used in recording, and the resolution of X-ray in-line hologram can not be higher than the cutoff frequency of recording material, when X-ray source is coherent..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 717 (1993)
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Elimination of the conjugate image in 360° rainbow holography
[in Chinese], and [in Chinese]
The effect of conjugate image in reconstruction of annular aperture rainbow hologram is analysed theoretically and experimentally. The dependence of conjugate image intensity upon the medium depth and the object-reference beam angle is derived. The condition of eliminating conjugate image for conventional 6 μm plates i
The effect of conjugate image in reconstruction of annular aperture rainbow hologram is analysed theoretically and experimentally. The dependence of conjugate image intensity upon the medium depth and the object-reference beam angle is derived. The condition of eliminating conjugate image for conventional 6 μm plates is thus indicated. Based on this principle, the large viewing angle (47°) annular aperture one-step rainbow hologram without interference of conjugate image is realized for the first time..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 723 (1993)
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Novel photopolymer holographic recording material and applications
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Holography with a blue sensitive photopolymer system and novel repolymerizing fixing methods have been developed. The experimental result is shown in Fig 2. The photosensitive medium is" composed of photosensitizing dye, chain transfer agent, initiator, monomer and polymeric film-forming binder. Coatings are cast
Holography with a blue sensitive photopolymer system and novel repolymerizing fixing methods have been developed. The experimental result is shown in Fig 2. The photosensitive medium is" composed of photosensitizing dye, chain transfer agent, initiator, monomer and polymeric film-forming binder. Coatings are cast from solution onto a washed glass plate..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 728 (1993)
Get PDF
Direct pointwise analysis of double exposure specklegrams with digital image processing
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A pointwise analysis method, which is used for obtaining Young's fringe patterns and measuring the magnitudes and directions of displacements by directly processing double exposure specklegrams with digital image technique, has been presented. In this procesure. If a proper speckle recording arrangement and a suita
A pointwise analysis method, which is used for obtaining Young's fringe patterns and measuring the magnitudes and directions of displacements by directly processing double exposure specklegrams with digital image technique, has been presented. In this procesure. If a proper speckle recording arrangement and a suitable magnifying power of the microscopic objective are selected, a high measuring sensitivity and accuracy can be obtained..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 734 (1993)
Get PDF
Nonlinear Optics
Analysis of two-field bistabilities in optically pumped sub-millimeter laser
[in Chinese], [in Chinese], and [in Chinese]
The bistabilities of the pumping laser and the emitting laser in an optically pumped sub-millimeter laser are studied by using a three-level homogeneously broadened two-field semiclassical model. The bistable behaviour varies drastically with the damping rates of the variables of the media. The emergence of bisability
The bistabilities of the pumping laser and the emitting laser in an optically pumped sub-millimeter laser are studied by using a three-level homogeneously broadened two-field semiclassical model. The bistable behaviour varies drastically with the damping rates of the variables of the media. The emergence of bisability is governed by properly choosing the absorptive and gain coefficients of the media and the cavity damping coefficients..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 684 (1993)
Get PDF
Mirrorless optical bistability induced by Stark effect at 10.784 μm
[in Chinese], [in Chinese], and [in Chinese]
The Stark bistability and optical limiting utilizing the interaction between the R(18) line of an isotopic C13O216 laser and the asQ(6,6) transition in NH gas, are observed. The stead-state theory with Doppler broadening is analyzed. The experimental results are approximately consistent with the theoritical analyses.
The Stark bistability and optical limiting utilizing the interaction between the R(18) line of an isotopic C13O216 laser and the asQ(6,6) transition in NH gas, are observed. The stead-state theory with Doppler broadening is analyzed. The experimental results are approximately consistent with the theoritical analyses..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 690 (1993)
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Propagation of optical soliton pulses in fiber amplifiers
[in Chinese], [in Chinese], and [in Chinese]
Propagation of optical solitons in fiber amplifiers is discussed by considering a model that includes gain dispersion, intrapulse stimulated Raman scattering (ISRS) and two-photon absorption. The numerical results show that the amplification of optical solitons is unstable in the anomalous dispersion regime. The solito
Propagation of optical solitons in fiber amplifiers is discussed by considering a model that includes gain dispersion, intrapulse stimulated Raman scattering (ISRS) and two-photon absorption. The numerical results show that the amplification of optical solitons is unstable in the anomalous dispersion regime. The soliton pulses split into several subpulses symmetrically because of gain dispersion while ISRS results in soliton pulses split asymmetrically. An interplay between the effects of gain dispersion and ISRS can lead to novel temporal and spectral features. Bandwidth limited amplification of soliton pulses can suppress the self-frequency shift induced by ISRS. Propagation of chirped soliton pulses are also analyzed..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 695 (1993)
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Observation of amplified Raman in a light guide
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, we report the coupling amplification of the Stokes seed beam in Raman medium H2, which is excited by a single laser reflected many times in a light guide without focusing. The amplifying coefficient over 2 is observed and the quality of the amplified beam is the same as or more better than the seed beam.
In this paper, we report the coupling amplification of the Stokes seed beam in Raman medium H2, which is excited by a single laser reflected many times in a light guide without focusing. The amplifying coefficient over 2 is observed and the quality of the amplified beam is the same as or more better than the seed beam..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 701 (1993)
Get PDF
Optical Devices
Stray light analysis with PC computer
[in Chinese], and [in Chinese]
A Stray radiation analysis program suitable for use on PC computer is described. The program is ideally suited for quick estimates of stray light performance in well-baffled optical systems, to calculate the single scatter of main mirror, double scatter of baffle-mirror, and diffraction-scatter of baffle edge in a simi
A Stray radiation analysis program suitable for use on PC computer is described. The program is ideally suited for quick estimates of stray light performance in well-baffled optical systems, to calculate the single scatter of main mirror, double scatter of baffle-mirror, and diffraction-scatter of baffle edge in a similar form of some large program of stray radiation analysis. The prediction made by the program for a typical system is comparable with the result of the APART large analysis program..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 750 (1993)
Get PDF
Physical Optics
Propagation of non-Gaussian beams
[in Chinese], [in Chinese], and [in Chinese]
A tensor method is developed in this paper to deal with the propagation of non-Gaussian and non-symmetric optical beams. Three tensors are defined to describe any profile beams. Their transformation rules through non-symmetric systems are derived by using two-dimension Huygens integral. The beam quality factor of arbit
A tensor method is developed in this paper to deal with the propagation of non-Gaussian and non-symmetric optical beams. Three tensors are defined to describe any profile beams. Their transformation rules through non-symmetric systems are derived by using two-dimension Huygens integral. The beam quality factor of arbitrary beam is discussed. As an example, the transformation of high-order Hermite-Gaussian beam through a cylindrical lens system is given..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 740 (1993)
Get PDF
Rapid Communications
Influence of the adiabatic-magnetic-field distribution at the entrance of wiggler on the output power and efficiency in a free-electron laser
[in Chinese], [in Chinese], and [in Chinese]
The influence of the adiabatic-magnetic-field distribution at the entrance of wiggler on the output power, gain, and efficiency in a free-electron laser is investigated in terms of nonlinear simulation. Results show that the distribution f(kwz) = (kwz/2πNw)3 is better and closer to the measured data than both f=sin2(kw
The influence of the adiabatic-magnetic-field distribution at the entrance of wiggler on the output power, gain, and efficiency in a free-electron laser is investigated in terms of nonlinear simulation. Results show that the distribution f(kwz) = (kwz/2πNw)3 is better and closer to the measured data than both f=sin2(kwz/4Nw) and f=(kwz/2πNw)2..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 756 (1993)
Get PDF
Study of the overlapping ratr of selfoc lens arrays
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The overlapping rate of selfoc lens arrays is discussed and its influence on resolution and illuminance distrbution is analyzed in this paper. An important criterion is obtained for the manufacture of selfoc lens arrays after a series of measurement of single selfoc lens and lens arrays. The empirical formula concernin
The overlapping rate of selfoc lens arrays is discussed and its influence on resolution and illuminance distrbution is analyzed in this paper. An important criterion is obtained for the manufacture of selfoc lens arrays after a series of measurement of single selfoc lens and lens arrays. The empirical formula concerning the unevenness of illuminance is derived from experimental data..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 759 (1993)
Get PDF
The optical bistability in fullerenes
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
We have observed for the first time the phenomena of optical bistability-switching for the film of C60/C70 with all-optical method of the nonlinear F-P cavity. The on-off time of optical switching is about 10 ns.
We have observed for the first time the phenomena of optical bistability-switching for the film of C60/C70 with all-optical method of the nonlinear F-P cavity. The on-off time of optical switching is about 10 ns..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 763 (1993)
Get PDF
Investigation on the reverse saturable absorption of C
60
α-methylstyrene/styrene copolymer
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Solid plates of C60 α-methylstyrene/styrene copolymer have been obtained. The light transmissive properties of the plates were studied with a 10 ns, 530 nm laser beam. The reverse saturable absorption process, corresponding to optical limiting performance was observed.
Solid plates of C60 α-methylstyrene/styrene copolymer have been obtained. The light transmissive properties of the plates were studied with a 10 ns, 530 nm laser beam. The reverse saturable absorption process, corresponding to optical limiting performance was observed..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 766 (1993)
Get PDF
Spectroscopy
Measurement of hyperfine structure constant of high excited levels in
169
TmI
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
With a Tm-Kr hollow cathode discharge (HCD) lamp, we measured 21 transition lines of 169TmI by optogalvanic spectroscopy and determined the hyperfine structure constants of the upper levels, among them, seven are firstly reported to our knowledge. With the same HCD, the hyperfine structure constants of four excited lev
With a Tm-Kr hollow cathode discharge (HCD) lamp, we measured 21 transition lines of 169TmI by optogalvanic spectroscopy and determined the hyperfine structure constants of the upper levels, among them, seven are firstly reported to our knowledge. With the same HCD, the hyperfine structure constants of four excited levels are measured. by two-color resonance..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 673 (1993)
Get PDF
Calculation of 4f
6
5d energy levels of Eu
2+
ion in KX(X=Cl,Br,I) crystals
[in Chinese], and [in Chinese]
According to the coupling model of 4f6(7FJ) and 5d, a calculating method for 4f65d energy levels of Eu2+ ion in KX(X=Cl,Br,I) crystals was proposed. The parameter expressions of energy levels were obtained and the numerical calculations were carried out. The calculated results agree with the exprimental values.
According to the coupling model of 4f6(7FJ) and 5d, a calculating method for 4f65d energy levels of Eu2+ ion in KX(X=Cl,Br,I) crystals was proposed. The parameter expressions of energy levels were obtained and the numerical calculations were carried out. The calculated results agree with the exprimental values..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 13, Issue 8, 679 (1993)
Get PDF
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