Contents
1983
Volume: 3 Issue 9
20 Article(s)
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Research Article
Fourier Optics and Signal Processing
Illterferogram analyses with microcomputer
WU SHUDONG, and ZHENG HUI
Based on a microcomputer, authors developed an interferogram data analysis system which can perform wavefront interpolation, aberration analyses, OPD contour mapping,PSF and OTF calculations etc.,The system is also capable of correcting errors caused by interferometers and measuring average wavefront curvature.The algoBased on a microcomputer, authors developed an interferogram data analysis system which can perform wavefront interpolation, aberration analyses, OPD contour mapping,PSF and OTF calculations etc.,The system is also capable of correcting errors caused by interferometers and measuring average wavefront curvature.The algorithms may be applied to any interferometric systems with a standard reference wavefront..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 815 (1983)
MTF deterioration by image motion in electro-ptical imaging system
XIANG SHIMING
According to the linear system theory in the time domain, this paper discusses ome problems of MTF deterioration caused by image motion under two special conditions, constant velocity linear motion and harmonic vibration. Refering to a set of experimental data, some analyses have been made for the efficiency of the MTFAccording to the linear system theory in the time domain, this paper discusses ome problems of MTF deterioration caused by image motion under two special conditions, constant velocity linear motion and harmonic vibration. Refering to a set of experimental data, some analyses have been made for the efficiency of the MTF dete-ricra, tion coefficiency relation and compared with the other ones in some literatures under the condition of the linear image motion..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 821 (1983)
Joint transform real-time optical correlator using noncrystalline film of As2S3
WANG TIANJI
Noncrystalline film of As2S3 is used as a nonlinear recording material of the joint transform optical processor. Real-time cross-correlation between two transparencies has been demonstrated using the optical processor. In this processor an argon laser beam (λ1 = 4880 A) is used to record the Fourier transform spectrum Noncrystalline film of As2S3 is used as a nonlinear recording material of the joint transform optical processor. Real-time cross-correlation between two transparencies has been demonstrated using the optical processor. In this processor an argon laser beam (λ1 = 4880 A) is used to record the Fourier transform spectrum of a reference object and of a test piece; a He-Ne laser beam (λ2 = 6828 A) is used to read a dynamic phase volume hologram simultaneously. The crosscorrelation peaks between two photographs of identical words hav? been observed. The set-up can bo applied to compare finger-prints..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 828 (1983)
Lasers and Laser Optics
Computer simulation of free-electron lasers with variable Wigglers
WANG MINGCHANG, ZHOU HUIFEN, and WANG ZHIJIANG
In this article KMR theory is used to calculate the free-electron laser at 10.6?m and the effects of current density, laser intensity and energy distribution of initial electron beam are discussed. The results of computer simulation is given to compare several groups of different experimental parameters. It can be usedIn this article KMR theory is used to calculate the free-electron laser at 10.6?m and the effects of current density, laser intensity and energy distribution of initial electron beam are discussed. The results of computer simulation is given to compare several groups of different experimental parameters. It can be used to guide tho design on free-electron lasers, to determine the requirements on electron beam quality and Wiggler parameter. The gain of the radiation is expected to be 1~3%..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 779 (1983)
Channel-substrate planar-stripe GaAs/(GaAl) As integrated lasers with a buried output waveguide
PAN HUIZHEN, XU GUOHUA, XIAO ZONGTAO, CHEN ZONGQUAN, SHEN PENGNIAN, FU XIAOMEI, and WANG HUIMIN
In order to develop single mode fiber optical communication, an integrated channel-substrate planar-stripe GaAs/(GaAl)As laser coupled with a two dimensional waveguide was designed and fabricated. The waveguide structure of the integrated device was designed on the base of evanescent field coupling, and the optical parIn order to develop single mode fiber optical communication, an integrated channel-substrate planar-stripe GaAs/(GaAl)As laser coupled with a two dimensional waveguide was designed and fabricated. The waveguide structure of the integrated device was designed on the base of evanescent field coupling, and the optical parameters including the refractive index and the thickness for each layer were estimated from the numerical solution of the eigenvalue equation for three and four layer slab waveguide. A reversed p-n junction was adopted for current confinement. The device was fabricated from an epitaxial wafer grown by liquid phase epitaxy on a channelled substrate with the desired layers, compositions, and carrier concentrations. Selective chemical etching and conventional device technology were nsed to fabricate the twin-laser with the two dimensional convex waveguide buried in the channel. Mode selection and amplification due to optical injection was demonstrated from the spectrum measurement, and single longitudinal mode oscillation waa achieved by suitable adjusting the synchronous pulse currents applied on the both active regions. Finally, the longitudinal mode selectivity and the relation of the active layer thickness to the mode power transfer efficiency and threshold currQat density are discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 785 (1983)
Impendance measurements of discharge XeCl laser and its effect on the characteristics of laser output
LOU QIHONG, and HE QISHKNG
The impedances of PFN transmission line driven discharge XeCl laser were measured from 1 to 10 atmospheres total gas pressure. The experimental result shows that the increasing of total gas pressure oan improve the impodanoe matching between PFN and gas discharge and increase the energy deposited in gas discharge. On tThe impedances of PFN transmission line driven discharge XeCl laser were measured from 1 to 10 atmospheres total gas pressure. The experimental result shows that the increasing of total gas pressure oan improve the impodanoe matching between PFN and gas discharge and increase the energy deposited in gas discharge. On the other hand, the fluorescence duration of XeCl B→X transition is reduced by various quenching processes at high gas pressure. According to these two effects, the optimum total gas pressure for discharge XeCl laser is about 4~6 abmosplieres..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 792 (1983)
A steady-state analytical model of the infrared opto-galvanic effect in CO discharged positive column
WANG YUMIN, ZHANG SHUNYI, and GUI ZENXIN
A steady-state analytical model of the infrared optogalvanic effect (OGE) in CO discharged positive column is given. Results indicate that it is different from that of the visible and UY in the atomic gas, in which the OGE is caused by the differences in the collisional ionization rates of the levels coupled by the lasA steady-state analytical model of the infrared optogalvanic effect (OGE) in CO discharged positive column is given. Results indicate that it is different from that of the visible and UY in the atomic gas, in which the OGE is caused by the differences in the collisional ionization rates of the levels coupled by the laser.However,it is shown that the thermal effect due to VT and VVT relaxation in the resonance transition and the superelastic collisions between electrons and molecules in the excited vib-rotational levels are responsible for this effects. Based on this model, the dependences of the opto-galvanio voltage on the gain (or absorption), in tensity, dynamic resistance and current have been given. On the whole, the model is found to agree with the experimental results. Thus, a new method to probe laser medium parameters e. g. saturation intensily, gain i or absorption) distribution over the vib-rotational levels and the resonance interaction in CO gas has been proposed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 797 (1983)
Materials
The equation of two level system-intensive fields interaction and its analytic solution
LI CHANGJIANG
In this paper, the general optical Bloch equation describing interaction between intensive fields and two level system is obtained without using rotating wave approximation. The first-order solution of this equation is obtained by iterative method and analytic formulas of transition probability as a function of time, pIn this paper, the general optical Bloch equation describing interaction between intensive fields and two level system is obtained without using rotating wave approximation. The first-order solution of this equation is obtained by iterative method and analytic formulas of transition probability as a function of time, perturbation frequency and strength are presented. These results are in agreement with those obtained by an iterative step-wise power series and numerical integration solution for the time dependent Schrodnger equation. And these simplified and clear mathmatical formulas facilitate the application of physics..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 769 (1983)
Analyses of the IR multiphoton dissociation process and the reaction channel of CCl3F
WANG PEINAN, WAN XINNONG, SUN DIECHI, and LI FUMING
A pulsed TEA CO2 lager was used for the IR photolysis of CCl3F. The dissociation fragments were detected by the methods of laser induced fluorescence and the IR analysis of the final products. The final products were CCl4, CCl2F2 and the three isomers of C2Cl2F2. The dissociation process of CCl3F and the possible reactA pulsed TEA CO2 lager was used for the IR photolysis of CCl3F. The dissociation fragments were detected by the methods of laser induced fluorescence and the IR analysis of the final products. The final products were CCl4, CCl2F2 and the three isomers of C2Cl2F2. The dissociation process of CCl3F and the possible reaction channels for the formation of the tinal products were discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 774 (1983)
Study of photochromic glasses by small-angle X-ray scattering
YIN BAOZHONG, and SHEN JUYUN
The relationship of the size of silver halide crystallites with heat treatment temperature has been studied by means of small-angle X-ray scattering (SAXS). Similar to original glass, an obvious scatter was found in glass treated bolow 490?. The behaviour of interference can be seen in the glass with only 0.3 wt. % Ag.The relationship of the size of silver halide crystallites with heat treatment temperature has been studied by means of small-angle X-ray scattering (SAXS). Similar to original glass, an obvious scatter was found in glass treated bolow 490?. The behaviour of interference can be seen in the glass with only 0.3 wt. % Ag. It may be suggested that the ions of silver are concentrated in the microheterogeneous drops of the phase dispersive Na2O-B2O3. The particle size of silver halide in treated glass which cooled from higher temperature to 440 ℃ and maintained for some time and then quenched to ambient temperature was largor than that in the glass directly cooled to ambient temperature which was only a/bout 11.0 nm. By introducing ZrO2 into the glass the particle SiZe reached to near 20.0 nm. The liquid-liquid phase separation In the matrix glass was rcore difficult to determine quantitatively by SAXS because the ditiorence of the eleotron density between the dispersive and continuous phase is too small..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 832 (1983)
Nonlinear Optics
Studies on the transient process of a subnanosecond pulse dye laser
CHEN WENJU, LIN SHIXIONG, ZHANG QUILAN, and LIN MEIRONG
A nitrogen laser pumped relaxation-oscillation-dye-laser with subnanosecond pulses is described in this paper. The formation processes of its relaxation oscillations and subnanosecond pulses have been observed. Approximate analytic solutions for the rate equations have been obtained in different stages of the initial tA nitrogen laser pumped relaxation-oscillation-dye-laser with subnanosecond pulses is described in this paper. The formation processes of its relaxation oscillations and subnanosecond pulses have been observed. Approximate analytic solutions for the rate equations have been obtained in different stages of the initial transient process of the dye laser. The pulse width has been estimated by substituting the parameters and experimental values into the solutions, and the result agrees with that of the experimental values into the solutions^ and tho result agrees with that of the experiments within ail order of magnitude..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 805 (1983)
A cusp catastrophe model of optical bistability
LI CHUNFEI, and MA AIQUN
A simple and clear catastrophe theory model of optical bistability is proposed, which indicates the threshold conditions for the occurrence of optical bistability and the methods for the control of the bistable characteristics.A simple and clear catastrophe theory model of optical bistability is proposed, which indicates the threshold conditions for the occurrence of optical bistability and the methods for the control of the bistable characteristics..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 811 (1983)
Rapid Communications
Quality improvement of laser speckle patterns by the method of changing aperture
ZHAO DEXIN
This paper puts forward a method of taking a laser speckle pattern interferential photograph recorded by two apertures (an annular and biannular aperture). It gives more homogeneous diffraction halo of distribution of light intensity and better Young s fringes image.This paper puts forward a method of taking a laser speckle pattern interferential photograph recorded by two apertures (an annular and biannular aperture). It gives more homogeneous diffraction halo of distribution of light intensity and better Young s fringes image..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 846 (1983)
Image reconstruction of phase conjugation by BSBS in an optical fiber
YANG TIANLONG, and YAO BINGZHONG
The image reconstruction of phase conjugation by BSBS in a multimode optical tiber has been studied experimentally. The image reconstructed by BSBS is approximately corresponding to the phase-conjugated image of the incident laser. The Stokes frequency shift is about 38.6 GHz.The image reconstruction of phase conjugation by BSBS in a multimode optical tiber has been studied experimentally. The image reconstructed by BSBS is approximately corresponding to the phase-conjugated image of the incident laser. The Stokes frequency shift is about 38.6 GHz..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 850 (1983)
Mode coupling in a double-frequency compound cavity dye laser
LI SHIQUN, ZOU YINGHUA, and XIA ZHONGJU
In this paper the mode coupling equations are used to study double-frequeney dye laser with a compound cavity. The double-frequency stable operation condition, the condition of inhibiting broad-band oscillations and the intensity ratio of two frequencies are deduced. Using a graphical method it has been found that thisIn this paper the mode coupling equations are used to study double-frequeney dye laser with a compound cavity. The double-frequency stable operation condition, the condition of inhibiting broad-band oscillations and the intensity ratio of two frequencies are deduced. Using a graphical method it has been found that this kind of laser has four typical tuning processes and some parameters can been conveniently obtained. Two new designs for double-frequency flashlamp-pumped dye laser with a compound cavity are discribed. The experimental results agree with, the theory on the whole..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 853 (1983)
Electrical signal produced by Nd-glass laser radiation breakdown of a ceramic thin plate
ZHENG CHDANXIANG, ZHOU YEWEI, YANG SHOUZHI, and XIE JIAN
Focusing a normal pulsed Nd-glass laser radiation on an nupolarized PZT ceramio thin plate, there was no electrical signal was observed between the two surface silver electrodes of the sample before the laser radiation breakdown through the sample. However, as soon as the breakdown of the sample happened, a pulsed elecFocusing a normal pulsed Nd-glass laser radiation on an nupolarized PZT ceramio thin plate, there was no electrical signal was observed between the two surface silver electrodes of the sample before the laser radiation breakdown through the sample. However, as soon as the breakdown of the sample happened, a pulsed electrical signal occured between the two surface-electrodes. The connections of the two electrodes remained unchanged in cases of the laser radiation irradiated the sample from either its front or back surface, the polarities of the produced electrical signals would be opposite to each other. When a hole penetrated on the sample was very small, the polarity of the signal was opposite to incident direction of the radiation. However^ when the hole became big enough, the polarity of the signal would turn to incident direction of the racliafcion..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 861 (1983)
Thin Films
Electric field distribution and optical losses in optical coatings
GU PEIPU
In this paper the electric field distribution in optical coating is calculated by Fresnel coefficient matrix method. On the bases of the distribution of fields, the design for a conventional antireflection coating, high reflective coating and an interference filter have been improved. These examples show the relationshIn this paper the electric field distribution in optical coating is calculated by Fresnel coefficient matrix method. On the bases of the distribution of fields, the design for a conventional antireflection coating, high reflective coating and an interference filter have been improved. These examples show the relationship between field distribution and optical losses in thin films.With the distribution of the fields modified or the defect reduced in the layers and the interfaces, optical losses can be restricted. Thus, the successful method is provided for designing excellent optical coatings with lower losses..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 9, 839 (1983)
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