Contents
1994
Volume: 14 Issue 11
23 Article(s)
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Fiber Optics and Optical Communications
Dynamic Response of Fiber Optic mug Resonator at 1.5 μm
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this peper, the dynamic response of a fiber optic ring resonator (FORR) is investigated by considering a sinusoidal phase modulation. The modulation frequency is from 55 Hi to 300 KHz and the amplitude is rs. The steady fsctor and dynamic factor in a sinusoidsl phase modulation and a sawtooth wave Phase modulation iIn this peper, the dynamic response of a fiber optic ring resonator (FORR) is investigated by considering a sinusoidal phase modulation. The modulation frequency is from 55 Hi to 300 KHz and the amplitude is rs. The steady fsctor and dynamic factor in a sinusoidsl phase modulation and a sawtooth wave Phase modulation is analyses. THe theoratical and experimental results are given..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1210 (1994)
Holography
Effects of the Coherence on the Resolution in X-Ray Holography
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The effectS of the coherence of X-ray beams on the resolution of X-ray holograms are theoretically analyzed. The concluSion is that the temporal coherence length required for X-ray beams is a quadratic function of the resolution and the size of specimen in X-ray lensless Fourier transform holographyj and the temporal lThe effectS of the coherence of X-ray beams on the resolution of X-ray holograms are theoretically analyzed. The concluSion is that the temporal coherence length required for X-ray beams is a quadratic function of the resolution and the size of specimen in X-ray lensless Fourier transform holographyj and the temporal length required for X-ray beams is proportional to the square of the resolution in X-ray in line holography..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1166 (1994)
Theory Analysis of Optical Wavelet Transform Using Joint Transform Correlator
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Optical wavelet transform (WT) with joint transform correlator (JTC) was described in this Paper. Haar wavelets and Roberts filters, respectively, were put together with an object image as a joint image. At the output plane of the JTC, the WT of the object was obtained, the features, such as corners, edges, sharpening Optical wavelet transform (WT) with joint transform correlator (JTC) was described in this Paper. Haar wavelets and Roberts filters, respectively, were put together with an object image as a joint image. At the output plane of the JTC, the WT of the object was obtained, the features, such as corners, edges, sharpening images, of the object were extracted. These features will be useful in post-pattern recognition. A programmable optiCal joint wavelet transform system was proposed in this paper, which can be used to realize “true” WT of an object image. Digital simulation results are provided..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1172 (1994)
Optical Neural Net with Bioplar Interconnections for Parallel Determination of Similarities
[in Chinese], [in Chinese], and [in Chinese]
An expermental system of the Hamming neural network model is proposed.The System includes two Parts: an incoherent light interconnection net used to measure Similarities between the inpllt pattern and the memory patterns parallelly, and an electrinic circuit ugh to implement WTA operation. Some experimental results of An expermental system of the Hamming neural network model is proposed.The System includes two Parts: an incoherent light interconnection net used to measure Similarities between the inpllt pattern and the memory patterns parallelly, and an electrinic circuit ugh to implement WTA operation. Some experimental results of the system are presented..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1178 (1994)
Instrumentation, Measurement and Metrology
Characteristics and Aplications of Sauce-Resolving Grating Spectrograps
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The Principle and characteristics of the sauce-resolving grating spectrograph are discrital in this peper, emphasis on the pre-optics for collecting radiation and compellsating for astigmatism. The method for measuring the spatial resolution and the results obtained are presented and the well Weement is found between tThe Principle and characteristics of the sauce-resolving grating spectrograph are discrital in this peper, emphasis on the pre-optics for collecting radiation and compellsating for astigmatism. The method for measuring the spatial resolution and the results obtained are presented and the well Weement is found between the experimental results and the ray-tracing simulation results. Applications of the spectrograph in laserPtoduced plasma spectroscopy and X-ray laser study are discussed briefly..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1192 (1994)
A Uniform Line Focus System Using A Van-Focal Cylinder Lenses Array
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A novel line focus System for x-ray laser research is suggested. It is composed of a fair of cylinder lenses arrays and a aspherical lens. The line focus is illuminated uniformly, and it' s length is continuously tunable. The intensity distribution along the line focus is analyzed in details with physical optics meA novel line focus System for x-ray laser research is suggested. It is composed of a fair of cylinder lenses arrays and a aspherical lens. The line focus is illuminated uniformly, and it' s length is continuously tunable. The intensity distribution along the line focus is analyzed in details with physical optics method. The results are compared with other line focus techniques..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1198 (1994)
Lasers and Laser Optics
Self Q-Switched Nd:BGO Laser Pumped by Laser Diode
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Nd: BGO is a promising laser crystal as well as a useful magneto-optic medium. A diode laser pumped Nd: BGO laser at 1. 04 μm has been succeeded for the first time. CW output power of 40 mW with TEM00 mode and efficiency of 13. 3% have been obtained. The pumping threshold is 25 mW. Using the faraday rotational effect, Nd: BGO is a promising laser crystal as well as a useful magneto-optic medium. A diode laser pumped Nd: BGO laser at 1. 04 μm has been succeeded for the first time. CW output power of 40 mW with TEM00 mode and efficiency of 13. 3% have been obtained. The pumping threshold is 25 mW. Using the faraday rotational effect, we calculated the parameters of the diode laser pumped self Q-switched Nd:BGO laser. In which the magneto-optic modulator consists of the Nd:BGO crystal itself and a Brewster glass plate. Pulsed energy of 2 μJ with width of 100 ns has been detected at a repetition rate of 1 kHz..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1121 (1994)
Polarization Properties of Novel Prism Resonators for Use in Slab Lasers
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, starting from analyzing the normal triple prism and other polarizing elements, we have studied both theoretically and experimentally the polarization properties of two novel prism resonators used for slab lasers, i. e., the coaxis resonator with a compound total internal reflection (TIR) prism and a mirrIn this paper, starting from analyzing the normal triple prism and other polarizing elements, we have studied both theoretically and experimentally the polarization properties of two novel prism resonators used for slab lasers, i. e., the coaxis resonator with a compound total internal reflection (TIR) prism and a mirror, half o f which has reflectivity R and the other half has a high-reflection coating (R/HR mirror), and the folded resonator with a compound TIR prism, a normal triple prism and a R/HR mirror..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1127 (1994)
Influences of Thermal Lens on Output of Copper Vapor Laser Oscillator and Amplifiers
[in Chinese], [in Chinese], and [in Chinese]
The influences of thermal lens of copper vapor lasers on unstable resonator and amplifiers are analysed by using ray matrix analysis. Calculated resultS consistent with experimental ones are obtained. In addition, a method of compensation for the thermal lens effectS in master-oscillator-power-amphfier chain is presentThe influences of thermal lens of copper vapor lasers on unstable resonator and amplifiers are analysed by using ray matrix analysis. Calculated resultS consistent with experimental ones are obtained. In addition, a method of compensation for the thermal lens effectS in master-oscillator-power-amphfier chain is presented..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1133 (1994)
Nonlinear Optics
Near-Resonant Nonlinear Optical Response of Fullerene C60
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Time-resolved deSenerate four-wave mixins experiments were conducted on toluene solutions and film of C6o using the second harmonic generation of a 50 picosecond mode-locked Nd: YAG laser. A fast nonlinear optical response was observed from both Ceotoluene solutions and C6o film, and another iong-lived comPOnent was obTime-resolved deSenerate four-wave mixins experiments were conducted on toluene solutions and film of C6o using the second harmonic generation of a 50 picosecond mode-locked Nd: YAG laser. A fast nonlinear optical response was observed from both Ceotoluene solutions and C6o film, and another iong-lived comPOnent was observed only from C6o toluene solutions. The near resonant third-order nonlinear optical susceptibility of Cio estimated from the experimental result of the film is about (3.6±1.4)×10-10 esu..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1147 (1994)
SHG in the Silica Optical Fiber and its Mechanism Analysis
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
We report the experimental resultS of second-harmonic seneration (SHG) in the silica optical fiber using the prepared method and the microstructure change inner the fiber observed by the transmission electron microscope (TEM). A little of crystal in the fiber is observed. It is the structure change in the crystals afteWe report the experimental resultS of second-harmonic seneration (SHG) in the silica optical fiber using the prepared method and the microstructure change inner the fiber observed by the transmission electron microscope (TEM). A little of crystal in the fiber is observed. It is the structure change in the crystals after prefered the fiber that induced SHG..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1151 (1994)
Theoretical and Experimental Study of Nonlinear Distortion in Semiconductor Lasers
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Nonlinear distortion in semiconductor lasers has been analysed theoritically and the Formulas and charateristics of second order and third order distortion are obtained.The theoretical results are proven by experiments. It is also shown that the second order distortion in home-made DH-GaAlAs semiconductor lasers is serNonlinear distortion in semiconductor lasers has been analysed theoritically and the Formulas and charateristics of second order and third order distortion are obtained.The theoretical results are proven by experiments. It is also shown that the second order distortion in home-made DH-GaAlAs semiconductor lasers is serious. but the distortion over third order is negligible..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1155 (1994)
Physical Optics
Threshold Optindzation of Interference Image of Surface Roughness Measuring interferometer
[in Chinese]
In this paper, a brief and effective method-arithmetic mean thresholding is suggested for segmenting interference image of complex light interfereometer used in automatic measurement of surface roughness. The roughness profile information extracted from binary image after thresholding and calculated results of by samplIn this paper, a brief and effective method-arithmetic mean thresholding is suggested for segmenting interference image of complex light interfereometer used in automatic measurement of surface roughness. The roughness profile information extracted from binary image after thresholding and calculated results of by sampling enough height deviation data from roughness profile coinside with those charted and measured by TALYSURF 6 profilemeter. This thresholding method are also suitable for segmenting interference image of laser surface roughness interferometer..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1183 (1994)
The Relationship Between Numerical Aperture and Fringes Brightness of Digital Shearing Speckle Interferometry (DSSPI)
[in Chinese]
In this paper the formation theory of the digital shearing speckle interference fringes pattern is analysed, and the exact ralationship between fringes brightness and parameters of the TV camera numerical aperture etc. is obtained. A better digital shearing speckle interference fringe pattprn, indicated by the theoretiIn this paper the formation theory of the digital shearing speckle interference fringes pattern is analysed, and the exact ralationship between fringes brightness and parameters of the TV camera numerical aperture etc. is obtained. A better digital shearing speckle interference fringe pattprn, indicated by the theoretical analyses and experiments, can also be obtained by using a smaller numerical aperture and a He-Ne laser about 3 mW. The theory and results herein have a better guidance to the optimel parameters selection for making the digital shering speckle interferometric experiments..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1187 (1994)
Quantum Optics
Velocity Bunching of Atoms in Laser Standing Wave
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Velicity bunching a phenomenon of the atoms bunched near a special velocity in an intensive laser standing wave with negative detuning is studied. The velocity bunching results from laser cooling and heating of two-level atoms cooperatively. When the atomic velocity is lower than a critical velocity, the force will heaVelicity bunching a phenomenon of the atoms bunched near a special velocity in an intensive laser standing wave with negative detuning is studied. The velocity bunching results from laser cooling and heating of two-level atoms cooperatively. When the atomic velocity is lower than a critical velocity, the force will heat the atoms, and when higher than the critical velocity, the force will cool the atoms and then the atoms will be bunched at this critical velocity..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1161 (1994)
Rapid Communications
Determination of Angular Distributions of Excimer Laser Induced Plasma Near YBa2Cu3O7-xTarget Surface
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Axial and radial distributions of emission spectral intensities from XeCl excimer laser induced plasma near YBa2Cu3O7-xsuperconducting forget surface were measured by using an Optical Spectroscopy Analyzer (OSA). The ansular distributions of excited species in the plasma plume were obtained with curve sitting method onAxial and radial distributions of emission spectral intensities from XeCl excimer laser induced plasma near YBa2Cu3O7-xsuperconducting forget surface were measured by using an Optical Spectroscopy Analyzer (OSA). The ansular distributions of excited species in the plasma plume were obtained with curve sitting method on the assumption that each kind of excited species had corresponding uniform radiation probability over the plasma region respectively. The plasma plume exhibited a cos n θ spread and the value of n is between 2.78 and 7.63. The results were investigated as the functions of laser spot energy density and background oxygen pressure respectively..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1215 (1994)
Influence of High-lStstes on the Autoionization Spectra
[in Chinese]
A combination of multichannel quantum-defect theory with the K reaction matrix has been used to imvestigate the influence of high-l 3pnl, (l=4) configuurations on the Mg 3pnd (j=3) autoionization spectra. The introduction of the 3Pug (J=3) configurations allows us to construct a complete model of the 3pug (J=3) autoionA combination of multichannel quantum-defect theory with the K reaction matrix has been used to imvestigate the influence of high-l 3pnl, (l=4) configuurations on the Mg 3pnd (j=3) autoionization spectra. The introduction of the 3Pug (J=3) configurations allows us to construct a complete model of the 3pug (J=3) autoionization process. Physical mechanism of some experimental phenomena have been related to the derailed structures of the autoionization spectra. Our theoretical results agree well with the published experimental spectra..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1219 (1994)
Dispersion Equations of Inhomogeneous Planar Optical Waveguides
[in Chinese]
A new method for obtaining the analytical dispersion characteristics of planar waveguides with arbitrary refractive index profile is presented. The method is based on the transfer matrix theory and a new interpretation of the WKB approximation is proposed. A comparison with other methods and the exact numerical resultsA new method for obtaining the analytical dispersion characteristics of planar waveguides with arbitrary refractive index profile is presented. The method is based on the transfer matrix theory and a new interpretation of the WKB approximation is proposed. A comparison with other methods and the exact numerical results shows that our method is much more accurate than the ordinary WKB method and other existing approximate methods..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1223 (1994)
Reduction of Thermal Background of RENFWM Spectrum by Time-Delayed Method
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
We demonstrate that with the time-delayed mathod the Raman-resonance hidden in the thermal background can be revealed and the Raman-enhanced nonlegenerat6 four-wave mixing spectrum converts to a normal asymmetric lineshape with foe nonresonant background originating from the molecular-reortenactional grating. The experWe demonstrate that with the time-delayed mathod the Raman-resonance hidden in the thermal background can be revealed and the Raman-enhanced nonlegenerat6 four-wave mixing spectrum converts to a normal asymmetric lineshape with foe nonresonant background originating from the molecular-reortenactional grating. The experimental results are in good agreement with the theoretical predictions..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1227 (1994)
Fabrication of X Type Crossing Waveguide Structure Constructed by Large Single-Mode Rib SOI Waveguide
[in Chinese], [in Chinese], and [in Chinese]
X type crossing waveguide structures constructed by large single-mode rib SOI (Silicon-on-insulator) waveguide have been fabricated. The SOI structure is formed by SDB (silicon wafer direct bonding) process. When crossing angle of the crossing waveguides is equal to 2°, their crosstakles is below to -20 dB, their X type crossing waveguide structures constructed by large single-mode rib SOI (Silicon-on-insulator) waveguide have been fabricated. The SOI structure is formed by SDB (silicon wafer direct bonding) process. When crossing angle of the crossing waveguides is equal to 2°, their crosstakles is below to -20 dB, their radiation losses is below to 0.3 dB, and their propegstion losses of the direct channels are measured to beapptoximately 0.85 dB/cm at a wavelength of 1.3 μm..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1230 (1994)
Spectroscopy
Preparation and Spectral Properties of SiO2and SiO2-TiO2Gels Doped with Fullerenes
[in Chinese], and [in Chinese]
New composites of fullerenes/SiO2 and fullerenes/SiO2-TiO2 have been synthesized by selecting suitable solvents and special sol-gel processes. Absorption and nuorescene spectra of the composites were measured and discussed. Much stronger luminescence effects of the composites under 532 nm foot excitation can be obtaineNew composites of fullerenes/SiO2 and fullerenes/SiO2-TiO2 have been synthesized by selecting suitable solvents and special sol-gel processes. Absorption and nuorescene spectra of the composites were measured and discussed. Much stronger luminescence effects of the composites under 532 nm foot excitation can be obtained at room temperature..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1138 (1994)
Stark Spectra of Highly Excited Yb Atom
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The Stark spectra of Yb atom with m= 0 in the vicinity of n-18 wereobtained by using two-step excitation of π π polarized lasers in the applied electric field from o V/cm to 1514 V/cm. The method based on diagonalization of the energy matrix with the Stark effect was applied to Yb atom. The theoretical Stark map agreesThe Stark spectra of Yb atom with m= 0 in the vicinity of n-18 wereobtained by using two-step excitation of π π polarized lasers in the applied electric field from o V/cm to 1514 V/cm. The method based on diagonalization of the energy matrix with the Stark effect was applied to Yb atom. The theoretical Stark map agrees with experimental Stark map. It is observed that Stark manifold exhibits linear structure with theincrease of the electric field in the low-field region. A large oscillator-strength transfer between 1P1 state and nearby Stark manifold occurs in the course of anticrossing. The dependence of level-structure on quantum effects is discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1142 (1994)
Thin Films
Soft-X-Ray multilayered Dispersive Elements
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The preliminary results of making soft X-ray multilayered dispersive elementsare Presented. Based on the soft X-ray multilayered dispersive elements are of this groupthe fabrication procedure including the design, Performance simulation, coatingtechnique, and testing method is discussed through the preparation of Mo/SiThe preliminary results of making soft X-ray multilayered dispersive elementsare Presented. Based on the soft X-ray multilayered dispersive elements are of this groupthe fabrication procedure including the design, Performance simulation, coatingtechnique, and testing method is discussed through the preparation of Mo/Si and W/Simultilayer samples. These elements will be used in the researches of X-ray optics and Xray Spectroscopy..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 11, 1204 (1994)
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