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Acta Optica Sinica
Contents
1987
Volume: 7 Issue 1
17 Article(s)
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Research Article
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 1 (1987)
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Instrumentation, Measurement and Metrology
Measuring focal length and refractive index of a lens using Moire technique
JIANG JINHU, CHEN BINGQUAN, and WANG CHINHUA
In this paper the calculating formula of the Talbot length under the condition of the light fields of converging spherical waves is given, and a new method of measuring the focal length and refractive index of a lens with Moire technique ig presented. It avoids the deficiencies of other methods proposed in the recent t
In this paper the calculating formula of the Talbot length under the condition of the light fields of converging spherical waves is given, and a new method of measuring the focal length and refractive index of a lens with Moire technique ig presented. It avoids the deficiencies of other methods proposed in the recent two years..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 67 (1987)
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Lasers and Laser Optics
Resonant self-focusing of two-frequency laser beams in plasmas
XU TIEFONG, and XU ZHIZHAN
In this paper, we have studied theoretically the resonant Self-focusing of two-frequency laser beams in plasmas. From the plasma fluid equations, we have derived the expression of the nonlinear dieletric contants of plasmas driven by two-frequency laser beams and showed the effect of the ponderomotive force of the plas
In this paper, we have studied theoretically the resonant Self-focusing of two-frequency laser beams in plasmas. From the plasma fluid equations, we have derived the expression of the nonlinear dieletric contants of plasmas driven by two-frequency laser beams and showed the effect of the ponderomotive force of the plasma waves. After giving the approximate solution of longitudinal electrostatic field, the characters of resonant Self-focusing are showed. Finally, the influence of resonant Self-focusing on particle aooeleration in beat wave accelerator also be discussed..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 27 (1987)
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Measurement of electron density profile in a laser-produced plasma
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Electron density profile of the covana in a laser-produced plasma in measured by using Eaman-shifted probe with polarization interferometry. Results are obtained at several relative relay times of cylindrical and microsphere targets.
Electron density profile of the covana in a laser-produced plasma in measured by using Eaman-shifted probe with polarization interferometry. Results are obtained at several relative relay times of cylindrical and microsphere targets..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 36 (1987)
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Nonlinear Optics
Stimulated electronic Raman scattering in sodium vapor
MA ZUGUANG, HAN XIAOFENG, and LU ZHKNGUO
The first observation of the 3S-4S stimulated electronic Raman scattering (SEES) in sodium vapor with the infrared output tunable from 2.38μm to 2.65μm is reported. The calculation for the power gain factors and the measurment for the infrared output as a function of a dye laser tunning are made and both results are in
The first observation of the 3S-4S stimulated electronic Raman scattering (SEES) in sodium vapor with the infrared output tunable from 2.38μm to 2.65μm is reported. The calculation for the power gain factors and the measurment for the infrared output as a function of a dye laser tunning are made and both results are in good agreement. The pumping threshold in dependence of sodium vapor pressures are measured. The photon-conversion efficiency is about 30%. Simultaneously, the amplified spontaneous emission (ASE) on the Na 4S-3P transition is aleo observed..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 17 (1987)
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Longitudinal mode number of lasers and mode competition
PAN SHAOHUA
By employing the semiolassioal theory of lasers, relations between mode number and laser parameters are described. These parameters include the relative population difference, the line-width and line-shape of the transmission of intracavity tuning elements, and the difference between self-saturation and cross-saturatio
By employing the semiolassioal theory of lasers, relations between mode number and laser parameters are described. These parameters include the relative population difference, the line-width and line-shape of the transmission of intracavity tuning elements, and the difference between self-saturation and cross-saturation coefficients, etc. A detailed physical analysis based on mode competition theory is given..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 22 (1987)
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Physical Optics
The calculation method of the strehl definition for decenteral optical systems
CHEN HUEAN, and ZHUANG SONGLIN
The Strehl Definition (S. D.) is one of commonly used criterion for evaluating the quality of an optical system, especially, for the mircosoopic objectives. In this paper several problems, which play important role in S.D. calculations, are considered in detail. Namely, the defoous, the expansion formula of the wave ab
The Strehl Definition (S. D.) is one of commonly used criterion for evaluating the quality of an optical system, especially, for the mircosoopic objectives. In this paper several problems, which play important role in S.D. calculations, are considered in detail. Namely, the defoous, the expansion formula of the wave aberrations of the deoenteral system as well as the numerical calculation method. The proposed method can also be used for estimating the quality of the decenteral optical systems..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 43 (1987)
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Laser induced chemical etching by a single step
LI DING, GU YUANGANG, SHEN GUANGPING, and QIU MINGXIN
The scanning etching on Si, GaAs and Zn plates with a frequency doubling Ar+ laser at 257.3 nm is reported. The width of the smallest etched line 1.2μm was obtained. The dependence of the etching depth on the light intensity/scanning rate is given. The diffusion coefficient, free path of the halogen radical and scale o
The scanning etching on Si, GaAs and Zn plates with a frequency doubling Ar+ laser at 257.3 nm is reported. The width of the smallest etched line 1.2μm was obtained. The dependence of the etching depth on the light intensity/scanning rate is given. The diffusion coefficient, free path of the halogen radical and scale of laser focused spot were estimated for the first time by the method of the laser etching technique. A threshold phenomena was observed and explained..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 49 (1987)
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Compound holographic lenses used as a monochromator
JIANG TAGUANG, CAO GUOgGUANG, and HUANG PEIQING
This paper presents a double compound dichromated gelatin holographic lenses used as a monoohromator. The spectrum halfwidth of the holographic lenses was measured and calculated. The experimental results shown the feasiblity of a new type of the monoehromator.
This paper presents a double compound dichromated gelatin holographic lenses used as a monoohromator. The spectrum halfwidth of the holographic lenses was measured and calculated. The experimental results shown the feasiblity of a new type of the monoehromator..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 55 (1987)
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Far field patterns of the modes emitted from a weakly guiding optical fiber
WANG QI, YANG TIANLONG, and SHEN WENDA
It is proved theoretically in this paper that the field patterns of the traveling modes in a weakly guiding optical fiber are quite similar with those of the fiber-emitted modes in the far-field region. Based on our results, far-field peak intensities of the diffraction-added lobes observed on a screen are 2-3 orders o
It is proved theoretically in this paper that the field patterns of the traveling modes in a weakly guiding optical fiber are quite similar with those of the fiber-emitted modes in the far-field region. Based on our results, far-field peak intensities of the diffraction-added lobes observed on a screen are 2-3 orders of magnitude smaller than those of mode patterns. Therefore, it is possible to determine the traveling mode in a fiber from its far-field pattern..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 62 (1987)
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Rapid Communications
Three-dimensional reconstructure of neural cells on a computer
Wo MINCHEN, and LI QINXIUN
The ability of displaying stereograms on a computerized plotter has been applied to the 3-D reconstruction of cranial neural cells. We present in this paper the integrated digital constitutions of neural cells and the way of plotting stereo projective maps according to the stereopsis principle. The method provides a fl
The ability of displaying stereograms on a computerized plotter has been applied to the 3-D reconstruction of cranial neural cells. We present in this paper the integrated digital constitutions of neural cells and the way of plotting stereo projective maps according to the stereopsis principle. The method provides a flexible and straight forward way for the study of the structures and morphology of organic cells..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 74 (1987)
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A match filtering method with high efficiency
YANG GUOGUANG, SU YONGGANG, and FU SHAOJUN
The physical justification of pattern recognition with a phaseonly match filter is analysed in this paper. In the experiment the amplitude of Fourier transform of object is modified to reduce the intensity dynamic range, while phase information is preserved. The holographic match filter was made by dichromatic gelation
The physical justification of pattern recognition with a phaseonly match filter is analysed in this paper. In the experiment the amplitude of Fourier transform of object is modified to reduce the intensity dynamic range, while phase information is preserved. The holographic match filter was made by dichromatic gelation. The high emeiency correlation is obtained by using this method..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 78 (1987)
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The deductive method of the light lock Moire fringe
CAO XIANGQUN, JIN TONQ, and FAN HUALIANG
This paper describes a deductive method of the light lock Morie fringe profile. This is more brief and pronounced concept than the method proposed by Japaneses. In comparison the theoretical calculated value with the experimental data, the results are satisfactory.
This paper describes a deductive method of the light lock Morie fringe profile. This is more brief and pronounced concept than the method proposed by Japaneses. In comparison the theoretical calculated value with the experimental data, the results are satisfactory..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 82 (1987)
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The near infra-red confocal scanning interferometer
YUAN SHUZONG
In this paper, the scanning interferometer with confocal spherical cavity structure is described, which is operated round 0.85μm and 1.3μm respectively. The free spectral range of the interferometer is 4.3GHz, and the higest resolution is 36MHz (finesse is about 120).
In this paper, the scanning interferometer with confocal spherical cavity structure is described, which is operated round 0.85μm and 1.3μm respectively. The free spectral range of the interferometer is 4.3GHz, and the higest resolution is 36MHz (finesse is about 120)..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 87 (1987)
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Four-wave mixing used in optical amplitude encoding
Guo SIJI, and ZENG XIAODONG
The possibility of using transient four-wave mixing (TFWM) in optical amplitude encoding is studied theoretically. We developed an effective numerical method to solve coupled wave equations with discontinuous solutions, and to study the influences of system parameters on the quality of signal. It has been found that th
The possibility of using transient four-wave mixing (TFWM) in optical amplitude encoding is studied theoretically. We developed an effective numerical method to solve coupled wave equations with discontinuous solutions, and to study the influences of system parameters on the quality of signal. It has been found that the TFWM system is suitable for encoding and it can generate high data rate communication signals..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 92 (1987)
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Spectroscopy
Two-laser resonance enhanced photoionization spectrum of gas phase Benzene
FAN JUNYING, G. MULLER, J. L. LSMAN, W. B. SOHMID, and K. L. KOMPA
This paper reports the results of a two-laser resonance enhanced photoionization experiment of Benzene molecule. The excitation was done by two frequency doubled dye lasers. The first laser pumped the molecule to a selected singled state (S -1), from where it was ionized by a time delayed pulse of the second laser. The
This paper reports the results of a two-laser resonance enhanced photoionization experiment of Benzene molecule. The excitation was done by two frequency doubled dye lasers. The first laser pumped the molecule to a selected singled state (S -1), from where it was ionized by a time delayed pulse of the second laser. The ion quantum yield depends on the intermediate vibronic state as well as on the wavelength of the ionizing laser. From the structure and intensity of the measured ion spectrum we derived vibrational frequencies and molecular parameters of tlie ground electronic state of the ion to a high precision. The contributions of autoionizing Bydberg Levels to the ionization cross section can dlearly be distingnislied. from direct ionization some of these resonance peaks could be assigned to vibrations within these Rydber states..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 1 (1987)
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Intracavity absorption spectroscopy with a ring traveling-wave dye laser
HUAYQNG, KUANG YIZHONG, LIN HAI, and LU BAIDA
By using a cwring traveling-wave dye laser enhancement factor up to 105 of the intracavity absorption sensitivity was obtained in air even if the pump power was two times excess of threshold. Making use of singlefrequency scanning method for the first time, the resolution of. 10-2 angstrom was measured without sensitiv
By using a cwring traveling-wave dye laser enhancement factor up to 105 of the intracavity absorption sensitivity was obtained in air even if the pump power was two times excess of threshold. Making use of singlefrequency scanning method for the first time, the resolution of. 10-2 angstrom was measured without sensitivity reduction. The experimental results agree with the predictions of modified Brunner-Paul s theory..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 1, 11 (1987)
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