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Acta Optica Sinica
Contents
1987
Volume: 7 Issue 4
15 Article(s)
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 1 (1987)
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Holography
Analysis and study on the temporal coherence of gas laser with multi-longitudinal modes
YIN JIANPING, ZHANG BINGQUAN, LU JUNFA, and XIA JIANGANG
According to the Wiener-Khintohine law, we have derived a general formula on the temporal coherence of gas laser with multi-longitudinal modes, and given results on the temporal coherence of gas laser under the state of symmetric and nonsymmetrio distribution, When (1) . It is consistent with the results of reference [
According to the Wiener-Khintohine law, we have derived a general formula on the temporal coherence of gas laser with multi-longitudinal modes, and given results on the temporal coherence of gas laser under the state of symmetric and nonsymmetrio distribution, When (1) . It is consistent with the results of reference [4] and [2-3] respectively. Finally, from the theory and experiment, this paper analyses and studies temporal coherence of the above-mentioned four cases..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 341 (1987)
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Amount of information for the rainbow-holography system
TAO CHUNKUANG
In this paper, the image-forming relationship of diffraction for the rainbow-holography system is discussed by the eigen-theory method of optical information theory. The expressions of the amount of information and the number of spatial degrees of freedom are given when the limiting pupil for the system is rectangular
In this paper, the image-forming relationship of diffraction for the rainbow-holography system is discussed by the eigen-theory method of optical information theory. The expressions of the amount of information and the number of spatial degrees of freedom are given when the limiting pupil for the system is rectangular slit, the cross-like circle pupil, respectively..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 349 (1987)
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Integrated Optics
Calculation of index-distribution coefficients of GRIN rod and it s verification
CAO QINGLIN
Thig paper derived the formulas of caluclating the refractive index-distribution coefficients g, h4 and h6 corresponding to properties of the material used in ion-exchange process. The value of g obtained from these formulas with the measured data of the material are consistent with that measured by the imaging method.
Thig paper derived the formulas of caluclating the refractive index-distribution coefficients g, h4 and h6 corresponding to properties of the material used in ion-exchange process. The value of g obtained from these formulas with the measured data of the material are consistent with that measured by the imaging method..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 366 (1987)
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Lasers and Laser Optics
Investigations of picosecond ChI dye lasers
LIU YIXIAN, WANG YAGANG, ZHU WEI, LI FUMING, YANG SHANYUAN, and ZHOU PEILIN
The experimental set-up of a red picosecond pulse output from a ultrashof t cavity dye laser pumped by third harmonic from a colliding pulse mode-locked Nd:YAG laser is reported and the experimental results is presented in this paper. The dependences of the output laser wavelengths of chl a and b in different aggregati
The experimental set-up of a red picosecond pulse output from a ultrashof t cavity dye laser pumped by third harmonic from a colliding pulse mode-locked Nd:YAG laser is reported and the experimental results is presented in this paper. The dependences of the output laser wavelengths of chl a and b in different aggregations in solutions on the dye concentrations are studied. As chl a-ethanol solution with concentration of 2 × 10-3M and the length of the laser cavity less than 36 μm, a single mode-tun blea ps pulse train coula b=obtainea. Divergence angle of the laser beam ia about 60 mrad..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 289 (1987)
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A semiclassical theory of a two-mode two-photon laser
SUN SONGEN
The semiclassioal Lamb method applied to the problem of a two-mode two-photon laser is discussed in this paper.
The semiclassioal Lamb method applied to the problem of a two-mode two-photon laser is discussed in this paper..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 295 (1987)
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The resonant radiation of an atom excited by laser pulse trains
ZHANG WEIPING, and TAN WEIHAN
This paper discussed the solution of the Bloch equations of a two-level atom resonantly interacting with laser pulse trains in detail. In terms of the solution, we calculate the radiation spectrum of the two-level atom excited by the laser pulse trains and obtain the following conclusions: (1) for the atoms satisfying
This paper discussed the solution of the Bloch equations of a two-level atom resonantly interacting with laser pulse trains in detail. In terms of the solution, we calculate the radiation spectrum of the two-level atom excited by the laser pulse trains and obtain the following conclusions: (1) for the atoms satisfying the condition K1/K = 1 (such as gas atoms broadened by spontaneous emission), the laser pulse trains are almost equivalent to a CW laser; (2) for the atoms K1/K《1, saying, some solid atoms lik....
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 300 (1987)
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Flight-broadening effect in a gas laser with inhomogeneously broadened line
LI YINGHUONG, and GAO ZHI
In this paper, we suggest that the flight broadening should be an important factor governing line profile in a high-speed gas laser with inhomogeneously broadened line, if the characteristic flow time τj is comparable to the collision relaxation time τc. The integration -representation of profile was deduced. The width
In this paper, we suggest that the flight broadening should be an important factor governing line profile in a high-speed gas laser with inhomogeneously broadened line, if the characteristic flow time τj is comparable to the collision relaxation time τc. The integration -representation of profile was deduced. The width of line increases inversely proportional to t, i.e., under the proxi- mate condition of effective line width, where t=τj/τc, is the flowing parameter..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 311 (1987)
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Free electron laser in the visible or UV region
FU ENSHENG, LING GENSHEN, and WANG ZHIJIANG
Madey pointed out that the limit of short wavelength of free electron laser with a linear accelerator is about 1μm because of available current limit. We suggest in this paper that using higher harmonic operation of a linear accelerator, a visible or ultraviolet short wavelength free electron laser is perspective.
Madey pointed out that the limit of short wavelength of free electron laser with a linear accelerator is about 1μm because of available current limit. We suggest in this paper that using higher harmonic operation of a linear accelerator, a visible or ultraviolet short wavelength free electron laser is perspective..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 317 (1987)
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Nonlinear Optics
Studies of SERS effect of pyridine——The influence of silver film thickness
CAO ZHIQI, LENG YONGZANG, and LING DEHONG
In this paper, the SERS effect of pyridine on silver films with different thickness prepared by chemical deposition is studied. The experimental results show that geometry of metal surface plays an important role in SERS. The enhancement depends on not only the size and the separation of particles of silver surface, bu
In this paper, the SERS effect of pyridine on silver films with different thickness prepared by chemical deposition is studied. The experimental results show that geometry of metal surface plays an important role in SERS. The enhancement depends on not only the size and the separation of particles of silver surface, but also the ratio of the two. Finally, the waveguide resonance theory is used to explain the experimental phenomena. Our experimental results are in agreement with the zeroth order approximation calculation..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 356 (1987)
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Experimental study of factors affecting enhancement of SERS spectra (3)
GU RENAO, LENG YONGZHANG, and LING DEHONG
The effects of pH and applied potential on the enhancement of Surface Enhanced Raman Scattering (SEES) spectra of benzoic acid molecules adsorbed on the silver electrode surface have been studied. Experiments showed that bensoic acid molecules were adsorbed on the electrochemically roughened silver electrode surface vi
The effects of pH and applied potential on the enhancement of Surface Enhanced Raman Scattering (SEES) spectra of benzoic acid molecules adsorbed on the silver electrode surface have been studied. Experiments showed that bensoic acid molecules were adsorbed on the electrochemically roughened silver electrode surface via group -COO-. By changing the pH of solution, it was possible for benzoic acid molecules to be adsorbed on the electrode. The pH of solution and the applied potential affected the density of of adsorbed benzoic aoid molecules, and the applied potential affected the charge-transfer between group -COO- and silver electrode..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 361 (1987)
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Rapid Communications
Hybrid optical-digital diagnosis of pneumoconiosis
CHEN YIWEI, LIU QIZHEN, HE YONGBAO, WU ZHONGYA, and YU ZHAOLIN
This paper presents the results of a joint study of automatic diagnosis of chest radiographs of pneumoconiosis. The Hybrid Optical/Digital Image Processing System of Fudan University (OPSA-1) was used. New algorithms developed for feature selection and classification led to a higher efficiency through experiments, with
This paper presents the results of a joint study of automatic diagnosis of chest radiographs of pneumoconiosis. The Hybrid Optical/Digital Image Processing System of Fudan University (OPSA-1) was used. New algorithms developed for feature selection and classification led to a higher efficiency through experiments, with 94% accuracy in discriminating normal/abnormal radiographs..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 376 (1987)
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Experimental measurements of anharmonicity constants of CF
3
D
KUANG LIPING, XIE HUI, SONG QUAN, and KUANG YIZHONG
Experimental measurements of the infrared spectra of CF3D are reported. Five anharmonicity constants of OF3D are obtained directly from the equations which include fundamental frequencies, overtone and combination bands.
Experimental measurements of the infrared spectra of CF3D are reported. Five anharmonicity constants of OF3D are obtained directly from the equations which include fundamental frequencies, overtone and combination bands..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 382 (1987)
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Spectroscopy
CO laser magnetic resonance used for quantitative detection of NO
2
CHEN YANGQIN, LI FENGYAN, GONG BENZHI, and LI JINRUI
An apparatus of CO laser magnetic resonance used for quantitative detection of NO2 molecule is described in this paper. The mathematical expression of the LMR signal has been given. The dependence of the LMR signal on the molecular concentration and laser power has been studied. The experimental results are in agreemen
An apparatus of CO laser magnetic resonance used for quantitative detection of NO2 molecule is described in this paper. The mathematical expression of the LMR signal has been given. The dependence of the LMR signal on the molecular concentration and laser power has been studied. The experimental results are in agreement with the theoretical analysis..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 335 (1987)
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Vision, Color, and Visual Optics
Quantitative specification of colour using fuzzy operator
XIAO DEFENG
The basic fuzzy nature of colour is examined. The conventional colour specification system is analysed by using fuzzy operator. A new method for quantitatively specifying colour is also developed on the basis of fuzzy mathematics.
The basic fuzzy nature of colour is examined. The conventional colour specification system is analysed by using fuzzy operator. A new method for quantitatively specifying colour is also developed on the basis of fuzzy mathematics..
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Acta Optica Sinica
Publication Date: Jan. 01, 1900
Vol. 7, Issue 4, 371 (1987)
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