Contents
1990
Volume: 10 Issue 4
19 Article(s)
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Fiber Optics and Optical Communications
“Quasi-taper” equivalent method-a new approach to the study of exponential-type GRIN fiber lens
[in Chinese], and [in Chinese]
Based on the characteristics of refractive-index distribution, a new method is presented in this paper for the study of exponential-type GRIN fiber lens by considering the fiber as a "Quasi-tapered" GRIN fiber. The applicability of this method is analysed.Based on the characteristics of refractive-index distribution, a new method is presented in this paper for the study of exponential-type GRIN fiber lens by considering the fiber as a "Quasi-tapered" GRIN fiber. The applicability of this method is analysed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 356 (1990)
Holography
Statistical properties of the interferometric field in holographic interferometry
[in Chinese], and [in Chinese]
The statistical properties of the complex amplitude and the intensity of the interferometric field in holographic interferometry are derived by means of the statistical method. It is hown that the complex amplitude is a zero-mean circular complex Gaussian random process, the intensity obeys a hegative exponential probaThe statistical properties of the complex amplitude and the intensity of the interferometric field in holographic interferometry are derived by means of the statistical method. It is hown that the complex amplitude is a zero-mean circular complex Gaussian random process, the intensity obeys a hegative exponential proba-biliby density function and the ensemble average of the intensity represents the deformation information..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 340 (1990)
Enhancement and restoration of X-ray imaging
[in Chinese], and [in Chinese]
In this paper, we sug est a useful method of enhancement and restoration for X-ray imaging. Enhancement of X-ray imaging is done by adjusting paramenter in computer and result is satisfactory. MTF of X-ray images for stationary body is studid. For simplicity, only the degradation within the intensifying screens and theIn this paper, we sug est a useful method of enhancement and restoration for X-ray imaging. Enhancement of X-ray imaging is done by adjusting paramenter in computer and result is satisfactory. MTF of X-ray images for stationary body is studid. For simplicity, only the degradation within the intensifying screens and the effects of the extended X-ray source size are considerd. We have described the specific analytic MTF in certain casses and results are agrement with foreig computing results..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 345 (1990)
Imaging Systems
Imaging properties of large size optical arrays
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
ccording to the ray optical theory, the imaging properties of optical arrays are analysed. A general imaging transfer matrix is obtained, which includes a special case of paraxial ray approximation. Furthermore, we show that plane arrays imaging is approximating phase conjuation, and it is the phase conjugation only foccording to the ray optical theory, the imaging properties of optical arrays are analysed. A general imaging transfer matrix is obtained, which includes a special case of paraxial ray approximation. Furthermore, we show that plane arrays imaging is approximating phase conjuation, and it is the phase conjugation only for the paraxial case. Using a new pseudoconjugator-coneshaped corner arrays, the wavefront distortion compensation is demonstrated, and the experimental results are consistent with the theory of this paper..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 350 (1990)
Lasers and Laser Optics
The study of SiH4N2gas discharge plasma with LIF
[in Chinese], [in Chinese], and [in Chinese]
Mixed SiH4/N2 gas radio-frequency (RF) discharge plasma has been studied with laserr induced fluorescence (LIF). The intermediate species Si2 has been detected, and detection of Si2 in SiH4 RF discharge decomposition has not been reparted before.Mixed SiH4/N2 gas radio-frequency (RF) discharge plasma has been studied with laserr induced fluorescence (LIF). The intermediate species Si2 has been detected, and detection of Si2 in SiH4 RF discharge decomposition has not been reparted before..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 316 (1990)
Study of laser-induced plasma on dielectric thin-films
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
By using a Maon——Zehnder inter ferometer and an optical delaying system, we made a time-resolved multi-frame interference recording for the plasma on dielectric thin films produced by YAG laser. We have calculated the electron density and plasma shock speed from the series of interforograms, and firstly acquired relevaBy using a Maon——Zehnder inter ferometer and an optical delaying system, we made a time-resolved multi-frame interference recording for the plasma on dielectric thin films produced by YAG laser. We have calculated the electron density and plasma shock speed from the series of interforograms, and firstly acquired relevant results about 15 ns pulse width (FWHM) of 1.06 μm laser interacting with dielectric thin films within 150 ns..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 322 (1990)
Quantum noise in semiconductor lasers with co mposite double external cavity
[in Chinese]
The quantum noise spectra of semiconductor lasers (LD) with composite double external cavity are presented by using semiclassioal theory.The quantum noise spectra of semiconductor lasers (LD) with composite double external cavity are presented by using semiclassioal theory..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 328 (1990)
Three-dimensional transient thermal profile in slab laser
[in Chinese], [in Chinese], and [in Chinese]
In this paper, a three-dimensional model for temperature profile in finite laser slabs is presented. Closed-form temperature distributions are derived in general case? by which it is convenient to analyse the dependence of slab temperature profile on pump parameters, laster materials etc. Computerized calculations are In this paper, a three-dimensional model for temperature profile in finite laser slabs is presented. Closed-form temperature distributions are derived in general case? by which it is convenient to analyse the dependence of slab temperature profile on pump parameters, laster materials etc. Computerized calculations are performed to Confirm our theoretical predictions..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 334 (1990)
Nonlinear Optics
Generation and detection of macroscopically istinguishable quantum states
[in Chinese], and [in Chinese]
An exact solution for the nonlinear birefringent medium model is obtained by using SO(3) rotation group property. It is proved that coherent light entering the medium will evolve into a superposition of maorosoopioally distinguishable quantum states. In order to detect their interference fringes, holodyne detection schAn exact solution for the nonlinear birefringent medium model is obtained by using SO(3) rotation group property. It is proved that coherent light entering the medium will evolve into a superposition of maorosoopioally distinguishable quantum states. In order to detect their interference fringes, holodyne detection scheme is used and the probability distribution for the output of homodyne detector is calculated when the intial states being linear and circular polarization coherent light..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 289 (1990)
Group theory approach for stimulated Raman scattering
[in Chinese]
The symmetry of rotation-vibration states of diatomic molecules are discribed by means of group U (4). The matrix elements of stimulated Raman scattering are calculated by means of group theory approach. The cross sections and gain coefficients of stimulated Raman scattering are given. The results agree with the experiThe symmetry of rotation-vibration states of diatomic molecules are discribed by means of group U (4). The matrix elements of stimulated Raman scattering are calculated by means of group theory approach. The cross sections and gain coefficients of stimulated Raman scattering are given. The results agree with the experimental values..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 294 (1990)
Theory of transmission and amplification of high speed amplitude modulated beam in photorefractive crystal
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The theory of TWM with high speed amplitude modulated beam in photorefractive crystal is given. For the first time. The results indicate that the high speed informa-tion exchange in time domain between coupling beams and the amplification of the weak modulated beams is possible.It has been verified by the experiments.The theory of TWM with high speed amplitude modulated beam in photorefractive crystal is given. For the first time. The results indicate that the high speed informa-tion exchange in time domain between coupling beams and the amplification of the weak modulated beams is possible.It has been verified by the experiments..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 299 (1990)
TWM theory in photorefractive crystal with high-speed amplitude-modulated beams
[in Chinese], [in Chinese], and [in Chinese]
The coupling equations of TWM in photorefractive crystal with both CW beam and high-speed amplitude-modulated beam are given by Simplifing Kukhtarev equations. Some important conditions used for simplified coupling equations and the limitations to modulation speed are disscussed in this paper.The coupling equations of TWM in photorefractive crystal with both CW beam and high-speed amplitude-modulated beam are given by Simplifing Kukhtarev equations. Some important conditions used for simplified coupling equations and the limitations to modulation speed are disscussed in this paper..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 306 (1990)
Measurement of third order nonlinear refractive coefficients associated with the thermal effect in semiconductor-doped glasses
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Both the magnitude and the sign of the third order nonlinear refractive coefficients associated with thermal effect in semiconductor-doped glass have been measured using the inte aity-dependent dispersion relation of long-range surface plasmons. Because of the sharp ATE dip of lonf-range surface plasmons, the techniqueBoth the magnitude and the sign of the third order nonlinear refractive coefficients associated with thermal effect in semiconductor-doped glass have been measured using the inte aity-dependent dispersion relation of long-range surface plasmons. Because of the sharp ATE dip of lonf-range surface plasmons, the technique developed by the authors has a good accuracy..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 313 (1990)
Rapid Communications
Stimulated Raman scattering in CBrCl3liquid core fiber
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
11 Stokes orders of SRS were observed in CBrCl3 liquid core fiber pumped with a mode-locked and Q-switehed YAG laser at 1.06μm. Eelative peak power of pumping and Stokes pulses as well as the frequeonoy spectra of 9th, 10 th and 11 th Stokes light were measured. This kind of liquid core fiber can serve as an IR coheren11 Stokes orders of SRS were observed in CBrCl3 liquid core fiber pumped with a mode-locked and Q-switehed YAG laser at 1.06μm. Eelative peak power of pumping and Stokes pulses as well as the frequeonoy spectra of 9th, 10 th and 11 th Stokes light were measured. This kind of liquid core fiber can serve as an IR coherent light source-beyond 2μn wavelength..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 362 (1990)
Automatic processing of holographic interferogram with intense background
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The principle of de fects inspecting in selder joints on printed circuit board (PCB) by holographic method has been described briefly in this paper. In order to processing interferogram with intense background by computer, some suitable methods have been suggested. We have accomplished image background and noise depresThe principle of de fects inspecting in selder joints on printed circuit board (PCB) by holographic method has been described briefly in this paper. In order to processing interferogram with intense background by computer, some suitable methods have been suggested. We have accomplished image background and noise depressing, smoothing, thinning and recognition of the fringes. Satisfied rasults have been obtained..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 365 (1990)
Measurement of thermal expansion coefficients of optical thin films
[in Chinese], and [in Chinese]
Thermal expansion coefficients of optical the films can be measured by means of the combination of photothermal displacement optical team deflection technique and transverse photothermal dcffection technique. In this paper, single layers of SiO2, TiO2, ZrO2, MgF2 and ThF4 are taken as examples to show the experimental Thermal expansion coefficients of optical the films can be measured by means of the combination of photothermal displacement optical team deflection technique and transverse photothermal dcffection technique. In this paper, single layers of SiO2, TiO2, ZrO2, MgF2 and ThF4 are taken as examples to show the experimental methods and results..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 369 (1990)
Additional optical path caused by yaw of moving roof mirror in composite retro-refletor system
[in Chinese], and [in Chinese]
The composite retro-reflector system plays the role of the cubic corner retro-reflector on 2-D interferometric controlled precioion workstage. But it is liable to cause considerable additional optical path when it is yawing. The formulan for calculating the additional optical path are derived and the measures to reduceThe composite retro-reflector system plays the role of the cubic corner retro-reflector on 2-D interferometric controlled precioion workstage. But it is liable to cause considerable additional optical path when it is yawing. The formulan for calculating the additional optical path are derived and the measures to reduce the error are discussed in this paper..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 374 (1990)
Experimental study of laser of FB(Ⅱ) color centers in Na KCl crystals at liquid nitrogen temperature
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A laser utilizing FB (II) centers in Na-doped KCl crystals and operating stably a-liquid N2 temperature is described. Color center crystal was pumped by the frequencyt doubled output of a Q-switched Nd:YAG laser. Laser emission wavelenghth. ranges from 2.420 to 2.542 μm. Experimental results are discussed.A laser utilizing FB (II) centers in Na-doped KCl crystals and operating stably a-liquid N2 temperature is described. Color center crystal was pumped by the frequencyt doubled output of a Q-switched Nd:YAG laser. Laser emission wavelenghth. ranges from 2.420 to 2.542 μm. Experimental results are discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 378 (1990)
How to adjust the pseudocoloring of an encoded phase-picture through the spatial filtering
[in Chinese]
A new method adjusting pgendocoloring by spatial filtering is presented and its theoretical analysis is given.A new method adjusting pgendocoloring by spatial filtering is presented and its theoretical analysis is given..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 10, Issue 4, 382 (1990)
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