Contents
1988
Volume: 8 Issue 7
19 Article(s)
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Research Article
Fourier Optics and Signal Processing
Generalized Lau effect of arbitrary periodicalobjects: The analysis based on partial coherent transfer function
LU NAIGUANG, YE FEI, and PENG HUASHI
In this paper we present a new model for interpreting Lau effect on the basis of partial coherent transfer function in free-space propagation. The generalized formula for description of intensity distribution of Lau fringe is deduced. It is suitable for arbitrary periodical amplitude or phase objects. The condition of In this paper we present a new model for interpreting Lau effect on the basis of partial coherent transfer function in free-space propagation. The generalized formula for description of intensity distribution of Lau fringe is deduced. It is suitable for arbitrary periodical amplitude or phase objects. The condition of producing Lau fringe and output intensity for some typical periodical objects is analysed. The experimental results of Lau fringe produced by line gratings with different periods are given..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 604 (1988)
Strobuscopic speckle photographic method
JIANG JINHU, and CHEN BINGQUAN
In this paper, the fundamental principles of stroboseopic speckle photographic method is discussed.For a specklegram of harmonic or non-harmonic periodic vibrations in whole fieldanalysis, the analytic formulae of the distribution of the mean intensity of light and visibility of the fringes are given. Both theory and eIn this paper, the fundamental principles of stroboseopic speckle photographic method is discussed.For a specklegram of harmonic or non-harmonic periodic vibrations in whole fieldanalysis, the analytic formulae of the distribution of the mean intensity of light and visibility of the fringes are given. Both theory and experiments show that stroboseopic speckle method is obviously superior to time-average method..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 612 (1988)
Instrumentation, Measurement and Metrology
Absolute measurement of intracavity weak loss for injection Febry-Perot spherical cavity
XU YUGUANG, HONG ZHONGHUA, YU QINGYUE, and CHEN SHOUHUA
The loss in an injection Febry-Perot spherical cavity is very sensitive to the output intensity of optical beam. This behavior can be used for absolute measuroments of the cavity loss, even if the loss is very weak. The method has high contrast, high sensitivity and precision. The measurement system and its potential aThe loss in an injection Febry-Perot spherical cavity is very sensitive to the output intensity of optical beam. This behavior can be used for absolute measuroments of the cavity loss, even if the loss is very weak. The method has high contrast, high sensitivity and precision. The measurement system and its potential applications are presented..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 619 (1988)
Investigation of dislocation properties and motion in YAG by means of X-ray transmission topography with AgKa radiation
DENG PEIZHEN, and HU BING
The properties and distribution of defects in Nd:YAG crystals are successfully obtained by means of X-ray transmission topography with AgKa radiation. It is shown that there are several kinds of defects, such as growth striations. precipitated particles. edge dislocations, screw dislocations and mixed dislocations formThe properties and distribution of defects in Nd:YAG crystals are successfully obtained by means of X-ray transmission topography with AgKa radiation. It is shown that there are several kinds of defects, such as growth striations. precipitated particles. edge dislocations, screw dislocations and mixed dislocations formed by dislocation motions in 2Sd:YAG crystals grown by CZ and Temperature Gradient Techniques (TGT). Some experimental results are consistent with the results obtained by optical methods, however，X-ray method bad its special advantage in discriminating the properties of dislocations..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 625 (1988)
Measurements of thin film parameters by quasi-symmetric waveguide method
WANG YUMING
A way to reduce the cut-off thicknesses of the fundamental modes in slab waveguides with prism couplers was presented. The MgO film parameters (refractive index and thickness) were measured by use of the quasi-symmetric waveguide method described in the paper, and the measurement results were given.A way to reduce the cut-off thicknesses of the fundamental modes in slab waveguides with prism couplers was presented. The MgO film parameters (refractive index and thickness) were measured by use of the quasi-symmetric waveguide method described in the paper, and the measurement results were given..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 631 (1988)
Lasers and Laser Optics
Theory of synchronously pumped mode-locking dye lasers
BAO XIAOYI, and WU CUNKAI
In this paper we extend the theory of synchronously pumped mode-locking and obtain the precise solution, i.e. supermodes solution. The physical meaning of the supermodes solution is given. Under the condition of the lowest supermodes, the analytic expressions for pulsewidth, intensity and peak position are deduced. TheIn this paper we extend the theory of synchronously pumped mode-locking and obtain the precise solution, i.e. supermodes solution. The physical meaning of the supermodes solution is given. Under the condition of the lowest supermodes, the analytic expressions for pulsewidth, intensity and peak position are deduced. The effect of noise on supermodes solution of the synchronously pumped mode-locking dye laser is studied. The expressions for the spectrum of noise, the method of evaluating the noise source and the ratio of noise to signal are also obtained..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 577 (1988)
Anisotropy of ion emission in the laser-plasma interaction
SUN LAN, XU ZHIZHAN, ZHANG YIANZHEN, and CHEN SHISHENG
The anisotrop of ion emission was observed when laser irradiation of the aluminum or gold targets at 1.06μm wavelength with laser intensity of 1012 to 1014 W/cm2 and configurations of spot-focused and line-focused. The scaling law of ion velocity and the mass ablation have been studied with the analysis of ion emissionThe anisotrop of ion emission was observed when laser irradiation of the aluminum or gold targets at 1.06μm wavelength with laser intensity of 1012 to 1014 W/cm2 and configurations of spot-focused and line-focused. The scaling law of ion velocity and the mass ablation have been studied with the analysis of ion emission, the ani-sotropic angular distributions of ion velocity and momentum..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 584 (1988)
Materials
Study on defects in Nd: YAG crystals by darkfield and phase contrast microscopy
DENG PEIZHEN, QIAO JINGWEN, and HU BING
The resolution of Darkfield and Phase Contrast Microscopy is up to 10-500A. The fine structure of point defect clusters, small size dislocation loops and helical dislocations in Nd:YAG crystals can been observed very clearly by these techniques, especialy, the image of the undecorated edge dislocations and mixed dislocThe resolution of Darkfield and Phase Contrast Microscopy is up to 10-500A. The fine structure of point defect clusters, small size dislocation loops and helical dislocations in Nd:YAG crystals can been observed very clearly by these techniques, especialy, the image of the undecorated edge dislocations and mixed dislocations in crystals have also been got from them. The observation of undecorated dislocations was confarmed by chemical etching. optical birefringence and X-ray topography..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 636 (1988)
Rapid Communications
Statistical properties of light field at degenerate parametric down-conversion
SUN WANJUN
The evolution operator of state for degenerate parametric down-conversion has been obtained. By means of state function we have studied the statistical properties of light field at degenerate parametric down-conversion.The evolution operator of state for degenerate parametric down-conversion has been obtained. By means of state function we have studied the statistical properties of light field at degenerate parametric down-conversion..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 648 (1988)
Doppler-free saturated absorption spectroscopy of CO2 and SF6 molecules by using a resonant optoacous tic multipass cell (MPC)
CAI BANGWEI, LU BAIDA, and CHEN XIMING
The Doppler-free saturated spectroscopy of the CO2 and SF6 molecules is investigated experimentally by using optoacoustic detection with a resonant multipass cell. The width of the absorption dip for CO2 is measured to be about 2.5 MHz, five absorption dips for SF6 are observed in the experiments, and the dip width is The Doppler-free saturated spectroscopy of the CO2 and SF6 molecules is investigated experimentally by using optoacoustic detection with a resonant multipass cell. The width of the absorption dip for CO2 is measured to be about 2.5 MHz, five absorption dips for SF6 are observed in the experiments, and the dip width is about 1.9MHz. In both oases the spectral resolving power is greater than 107..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 653 (1988)
ABCD law for nonsymmetric optical systems
LIN QIANG, LU XUANHUI, and WANG SHAOMIN
Diffraction integral formula for general nonsymmetric optical systems is clearly derived by means of vector analysis. Based on the concept of tonsor complex curvature of radious, the ABCD law for nonsymmetric optical systems is presented. Also, an applying example is illustrated.Diffraction integral formula for general nonsymmetric optical systems is clearly derived by means of vector analysis. Based on the concept of tonsor complex curvature of radious, the ABCD law for nonsymmetric optical systems is presented. Also, an applying example is illustrated..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 658 (1988)
Approximate Talbot self-imaging effect for Gaussian beams and two new applications of Tablot effect
LU HONGJUN, and BAI GUIRU
The present paper has discussed some characters of appraximate Talbot self-imaging phenomena for incident spherical Gaussian beams. Upon using Talboi self-imaging a convenient way for measuring divergence angle of Gaussian beams and ultra-high amplification of the self-imaging in some condition are also proposed.The present paper has discussed some characters of appraximate Talbot self-imaging phenomena for incident spherical Gaussian beams. Upon using Talboi self-imaging a convenient way for measuring divergence angle of Gaussian beams and ultra-high amplification of the self-imaging in some condition are also proposed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 663 (1988)
Fresnel rhomb used as a optical wavelength plate
DING DAJUN, and LIU HANG
We have constructed Fresnel rhombs used as a λ/4 or λ/2 wavelength plate. This design was based on Fresnel s principle in a total internal reflection. We have made a transformation from a linear to a circular polarization or a rotation of a linear polarization vector in ultraviolet spectral legion.We have constructed Fresnel rhombs used as a λ/4 or λ/2 wavelength plate. This design was based on Fresnel s principle in a total internal reflection. We have made a transformation from a linear to a circular polarization or a rotation of a linear polarization vector in ultraviolet spectral legion..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 667 (1988)
Spatial fringe-scanning method for analyzing interference fringes
CHEN JINBANG, and LI XING
Interference fringes with a tilted wavefront are spatially scanned perpendicularly to the carrier fringes and analyzed using FFT algorithm. It is not necessary to use any device in order to modulate interference fringes temporally. Itis also not necessary to locate fring centers and to assign interger order number. In Interference fringes with a tilted wavefront are spatially scanned perpendicularly to the carrier fringes and analyzed using FFT algorithm. It is not necessary to use any device in order to modulate interference fringes temporally. Itis also not necessary to locate fring centers and to assign interger order number. In this paper. we propose these techniques for determining the topography of a wavefront from an interferogram. The accuracy is higher then standard deviation of 1/50 wavelength..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 669 (1988)
Spectroscopy
Multiphoton ionization spectroscopy of NO and study of transition channels
SHI ZHOUZHENG, LU CHENGZAI, XIA JINGFANG, and LI YUFEN
The (2+2) four-photon ionization spectra of NO via A2∑+ (v=0) and A2∑+ (v = 1) states are assigned and (3+1) MPI spectrum via F2A (v=0), H2∑(v=0) and H 2(v=0) states is discussed. Some intensity-anomalous lines of (2+2) MPI have been observed. Based on the signal-power dependence measurement for the normal and anomalouThe (2+2) four-photon ionization spectra of NO via A2∑+ (v=0) and A2∑+ (v = 1) states are assigned and (3+1) MPI spectrum via F2A (v=0), H2∑(v=0) and H 2(v=0) states is discussed. Some intensity-anomalous lines of (2+2) MPI have been observed. Based on the signal-power dependence measurement for the normal and anomalous lines, a double resonance and collision Ionization model is suggested to elucidate the intensity anomaly..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 590 (1988)
582.8nm collisional induced fluorescence emission and it s relaxational oscillations in optical pumped Ba/He system
MO CHUNSHONG, LOU QIHONG, WANG RUNWEN, and HUO YUNSHENG
We have observed 682.8 nm collisional induced fluorescence emission and it s relaxational oscillations in optically pumped Ba/He mixtures. Theoretical analysis and numerical calculations are presented and the results coincide with experimental observations.We have observed 682.8 nm collisional induced fluorescence emission and it s relaxational oscillations in optically pumped Ba/He mixtures. Theoretical analysis and numerical calculations are presented and the results coincide with experimental observations..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 596 (1988)
Fluorescence lines of single Cr and Cr pairs inBeAl6O10:Crcrystals
HU ZHIWEI, WU GUANGZHAO, MA XIAOSHAH, and PAN PEICONG
The fluorescence spectrum of BeAl6O10:Cr crystal consists of seven narrow lines and a broad b and. The difference between the lifetimes of the broad band and the lines is very big even at room temperature. There is less relationship between the band emission and the line emissions in BeAlGO10:Cr, unlike in BeAl2O4:Cr. The fluorescence spectrum of BeAl6O10:Cr crystal consists of seven narrow lines and a broad b and. The difference between the lifetimes of the broad band and the lines is very big even at room temperature. There is less relationship between the band emission and the line emissions in BeAlGO10:Cr, unlike in BeAl2O4:Cr. To identify the Cr centers, experimental study has been carried out. Based on the temperature-and the concentration dependence of the line intensities, we suggest that three mainlines result from two types of single or oeniers, and other two linee oome from Cr pairs centers..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 601 (1988)
Thin Films
Photoacoustic study on spectral absorption of op tical films
JIN GANG, BAI SHUANGE, AIA LUHUA, and CHOW QUANTIE
Considering the absorption taking place during the back and forth passages inside of the opticl films, and the optical films being "thermally thin" in photoacoustics, a photoacoustic expression for optical thin films is deduced according to the one-dimensional heat-flow piston model. The amplitude of photoacoConsidering the absorption taking place during the back and forth passages inside of the opticl films, and the optical films being "thermally thin" in photoacoustics, a photoacoustic expression for optical thin films is deduced according to the one-dimensional heat-flow piston model. The amplitude of photoacoustic signal is proportional to the absorptivity of the film. Some photoaooustio absorption spectra of films on glass are measured, which is in agreement with the theoretical expressoin. This photoaconstic spectral meiihod shows high sensitivity and precision, particularly Hi table for measuring tlie alosorpiiion spectra of weakly absorbing films..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 7, 643 (1988)
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