Contents
1996
Volume: 16 Issue 11
24 Article(s)
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Fourier Optics and Signal Processing
Property of a Novel Free Space Optical Comega Network
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Optical Comega network is a novel multistage interconnection network which is suitable to optical implementation. In this paper, the property and architecture of the network is analyed in detail, its interconnection function and featrue matrix are obtained, It is shown that the optical comega network is topologically eOptical Comega network is a novel multistage interconnection network which is suitable to optical implementation. In this paper, the property and architecture of the network is analyed in detail, its interconnection function and featrue matrix are obtained, It is shown that the optical comega network is topologically equivalent to frequent networks such as Staran, Crossover, Omega, Banyan and Baseline network..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1585 (1996)
High Order Local Interconnected Neural Network for Associative Memory
[in Chinese], [in Chinese], and [in Chinese]
The mathematical model of high order local interconnected neural network (LINN) is presented. Computer simulations on its associative memory are carried out. The results show that high order LINN has a much small interconnection weight matrix and the same associative memory ability, on the other hand, a large scale neuThe mathematical model of high order local interconnected neural network (LINN) is presented. Computer simulations on its associative memory are carried out. The results show that high order LINN has a much small interconnection weight matrix and the same associative memory ability, on the other hand, a large scale neural network can be constructed by using high order LINN if the size of interconnection weight matrix is limited..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1591 (1996)
Real Time Optical Correlation Based on Nonlinear Transform of LCLV
[in Chinese], [in Chinese], and [in Chinese]
A real time optical correlator with high discrimination is suggested in this paper. In this correlator, a liquid crystal light valve (LCLV) is used as real time input and image preprocessing device. In recording hologram, a piece of photorefractive crystal (Fe∶LiNbO 3) is used as holograhic recording material and a conA real time optical correlator with high discrimination is suggested in this paper. In this correlator, a liquid crystal light valve (LCLV) is used as real time input and image preprocessing device. In recording hologram, a piece of photorefractive crystal (Fe∶LiNbO 3) is used as holograhic recording material and a convergent spherical wave as reference light wave. the correlator is characterized by high discrimination, real time and flexible processing, and compact constructure..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1596 (1996)
Instrumentation, Measurement and Metrology
High Resolution Absorption Spectroscopy of Water Vapor at 917～945nm: Measurements of Line Strengths and Air Broadening Coefficients
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Water vapor high resolution spectroscopy were recorded with a cw narrow linewidth Ti∶Sapphire laser and a long pass absorption cell in 917～945 nm wavelength range. Measurements were made of line strengths with 4% uncertainty and air broadening coefficients with 6% uncertainty of 60 water absorption lines. Compared withWater vapor high resolution spectroscopy were recorded with a cw narrow linewidth Ti∶Sapphire laser and a long pass absorption cell in 917～945 nm wavelength range. Measurements were made of line strengths with 4% uncertainty and air broadening coefficients with 6% uncertainty of 60 water absorption lines. Compared with Chevillard′s line strengths data, the agreement is good with average ratios of 0.0986±0.0685. However, the difference of air broadening coefficients is obvious between Hitran-92 database and ours, with average ratios of 0.0906±0.164..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1619 (1996)
A New Method for Measuring the Veiling Glare Index of Long Focal Length Optical Systems and Theoretic Analysis
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A new method is proposed for measuring the veiling glare index of long focal length optical systems based on the analysis of the properties and their application fields of present measurement devices and the theoretical analysis on the stray light sources is also given.A new method is proposed for measuring the veiling glare index of long focal length optical systems based on the analysis of the properties and their application fields of present measurement devices and the theoretical analysis on the stray light sources is also given..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1626 (1996)
Experimental Calibration and Calculation of Diffraction Efficiency for Transmission Grating
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Configurations of the three transmission gratings used in our laboratary are introduced briefly. Relative diffraction efficiencies for these gratings have been calibrated on synchrotron radiation source. With the help of grating model, the important structure parameters of grating are obtained, and absolute diffractionConfigurations of the three transmission gratings used in our laboratary are introduced briefly. Relative diffraction efficiencies for these gratings have been calibrated on synchrotron radiation source. With the help of grating model, the important structure parameters of grating are obtained, and absolute diffraction efficiencies for these gratings are calculated and discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1631 (1996)
Simple Method for Determining Bragg Wavelength Shifts of Fiber Gratings
[in Chinese], and [in Chinese]
A simple fiber grating pair referencing method for measuring fiber grating Bragg wavelength shifts is reported. The temperature sensitivity of fiber grating Bragg wavelength was determined to be 0 0088 nm/℃, which was coincident very well with the experimental result measured using a fine tunable laser diode.A simple fiber grating pair referencing method for measuring fiber grating Bragg wavelength shifts is reported. The temperature sensitivity of fiber grating Bragg wavelength was determined to be 0 0088 nm/℃, which was coincident very well with the experimental result measured using a fine tunable laser diode..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1636 (1996)
Lasers and Laser Optics
Design for Pumping Efficiency of Rod Amplifier of Ellipic Cavities with Multiple Lamps
[in Chinese], and [in Chinese]
The influences of some factors of rod amplifier on its pumping efficiency are studied by numerical methods with certain radii of the rod and the lamps. These factors include the refectivity of the inside of its elliptic cavities, the cavities′ major and minor axises, the distance of the rod away from the central focus The influences of some factors of rod amplifier on its pumping efficiency are studied by numerical methods with certain radii of the rod and the lamps. These factors include the refectivity of the inside of its elliptic cavities, the cavities′ major and minor axises, the distance of the rod away from the central focus to the lamps, the number of the lamps and the structure of the glass tube for cooling the rod. The results are very useful for the design of rod amplifier..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1554 (1996)
The effects of dye concentration and pumping energy on the laser output are studied in a tunable quenching dye laser. Tunable range was measured. Some parameters were obtained in a coumarin 496 dye laser pjmped by a 308 nm XeCl laser.
[in Chinese], [in Chinese], and [in Chinese]
quenching dye lasers; tunable; pumping energy; pulse durationquenching dye lasers; tunable; pumping energy; pulse duration.
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1559 (1996)
Materials
The Mechanism of No Phonon Optical Transitions in SiGe Alloy
[in Chinese], [in Chinese], and [in Chinese]
The mechanism of the optical transition without phonons between the conduction band and the valence band in doped SiGe alloy is investigated, and the model of no phonon optical transition originated from the statistical distribution of the impurities is suggested. The dipole matrix elements of the transition are calculThe mechanism of the optical transition without phonons between the conduction band and the valence band in doped SiGe alloy is investigated, and the model of no phonon optical transition originated from the statistical distribution of the impurities is suggested. The dipole matrix elements of the transition are calculated based on this model and the upper limits of the dipole matrix elements are calculated. The mechanism of no phonon optical transition in undoped SiGe alloy is also suggested that it is the collectivity action of the deformation wavefunction around Ge atoms..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1641 (1996)
Damage Measurements of Optical Glass Materials
[in Chinese], and [in Chinese]
The method of polarized light extinction and Nomarski polarized light interferometer were used to detect the stress profiles and small damage spots optical glass material. Experimental results show that the Nomarski interferometer can help us to analyze the damage process of optical materials fairly well.The method of polarized light extinction and Nomarski polarized light interferometer were used to detect the stress profiles and small damage spots optical glass material. Experimental results show that the Nomarski interferometer can help us to analyze the damage process of optical materials fairly well..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1646 (1996)
Nonlinear Optics
Pulse Shape Dependence of Two Cell Stimulated Brillouin Scattering Phase Conjugation Mirror
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
When stimulated Brillouin scattering (SBS) is applied in laser drive system, it is necessary to consider the changes of SBS pulse shape, especially the leading edge shape, compared to pump pulse. For the pump pulse with several ns pulse width and 2ns leading edge, adding a small slow rising signal or a pre pulse at theWhen stimulated Brillouin scattering (SBS) is applied in laser drive system, it is necessary to consider the changes of SBS pulse shape, especially the leading edge shape, compared to pump pulse. For the pump pulse with several ns pulse width and 2ns leading edge, adding a small slow rising signal or a pre pulse at the root of pump pulse steep leading edge, then the SBS pulse shape is investigated for different two cell SBS phase conjugation (PC) mirror. The results show that the SBS leading edge shape can keep almost the same as the pump pulse for short amplifying cells and short focal length. The intensity ratio of SBS main-and pre-pulse is changed with different focal lengths for short amplifying cell..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1576 (1996)
Phase Properties of the Deformed Light Field Interacting with a Two Level Atom
[in Chinese], and [in Chinese]
Phase properties of the field in the deformed J C model at the resonant case are studied by using the deformed Pegg Barnett phase theory. The effect of the phase statistical and dynamical properties on the q deformed parameter is discussed.Phase properties of the field in the deformed J C model at the resonant case are studied by using the deformed Pegg Barnett phase theory. The effect of the phase statistical and dynamical properties on the q deformed parameter is discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1580 (1996)
Optical Devices
Model Study of Embedded Fiber Optic Fabry Perot Strains and Temperature Sensors
[in Chinese], and [in Chinese]
A model was studied for embedded intrinsic and extrinsic Fabry Perot fiber optic sensors. This model relates the strains and temperature changes in the sensors to the reflected light intensity. The model consists of two parts. Submodel Ⅰ relates the temperature and the strains inside the sensor to the change in sensor A model was studied for embedded intrinsic and extrinsic Fabry Perot fiber optic sensors. This model relates the strains and temperature changes in the sensors to the reflected light intensity. The model consists of two parts. Submodel Ⅰ relates the temperature and the strains inside the sensor to the change in sensor length and to the changes in th optical properties of the sensor. Submodel Ⅱ relates the changes in sensor length and optical properties to the changes in the intensity of the reflected light..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1650 (1996)
Quantum Optics
Theoretical Analysis of a Moving Three Level Atom Interacting Slantingly with a Standing Wave Laser Field
[in Chinese], and [in Chinese]
A momentum transfer of a moving three level atom interacting slantingly with a standing wave laser field is analysed. The results have shown that a stimulated Raman transition will be dominated, when some conditions are met by both the atom and the light field. If the light field seen by the atom is a “π/2 pulse” lightA momentum transfer of a moving three level atom interacting slantingly with a standing wave laser field is analysed. The results have shown that a stimulated Raman transition will be dominated, when some conditions are met by both the atom and the light field. If the light field seen by the atom is a “π/2 pulse” light, the atom will be in a coherent superposition state after interaction, the one state is the same as the initial state of the atom, and another state is a new state in which the degrees of atomic internal freedom and the center-of-mass momentum of the atom are all changed, especially, the momentum is changed by twice single-photon recoil momentum. Nevertheless, the probability of the atom in the two states is the same. If this mechanism is used for atomic wave interferometry, it is possible that atomic wave packets are coherently splitted..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1537 (1996)
An Alternative Definition of Higher Order Squeezing
[in Chinese]
Based on the higher order uncertainty relation an alternative definition of higher order squeezing is introduced in this paper. This definition differs from C.K.Hong and L.Mandel′s. The criterion of higher order squeezing is the higher order fundamental quantum fluctuation of amplitude. We examine the higher order squeBased on the higher order uncertainty relation an alternative definition of higher order squeezing is introduced in this paper. This definition differs from C.K.Hong and L.Mandel′s. The criterion of higher order squeezing is the higher order fundamental quantum fluctuation of amplitude. We examine the higher order squeezing for the squeezed coherent states and the superposition states using this definition, and compared the results with Hong and Mandel′s..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1543 (1996)
Dynamical Evolution of the Two Photon Jaynes Cummings Model in a Kerr Like Medium with Saturable Nonlinearity
[in Chinese], [in Chinese], and [in Chinese]
The collapse and revival phenomena in the population inversion and the time evolution of the purity of an atom undergoing a two photon process are inverstigated when the cavity is supposed to be filled with a saturable Kerr like medium. This study reveals how the simultaneous occurence of two nonlinear processes and thThe collapse and revival phenomena in the population inversion and the time evolution of the purity of an atom undergoing a two photon process are inverstigated when the cavity is supposed to be filled with a saturable Kerr like medium. This study reveals how the simultaneous occurence of two nonlinear processes and the saturation affect the atomic dynamics. Affect each other..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1549 (1996)
Rapid Communications
Plasma Boring of Ultra Intense Laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
For studing the plasma boring effect occurring in the ICF fast ignition scheme, a simple pistol model is presented to study the plasma compression and shock generation by ultra intense lasers. Scaling laws are derived for parameters characterizing the process.For studing the plasma boring effect occurring in the ICF fast ignition scheme, a simple pistol model is presented to study the plasma compression and shock generation by ultra intense lasers. Scaling laws are derived for parameters characterizing the process..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1662 (1996)
Spectroscopy
Four Level Model of Laser Induced Collisional Energy Transfer
[in Chinese], [in Chinese], and [in Chinese]
In this paper a four level model of laser induced collisional energy transfer (LICET) is presented in which the effects of the two intermediate states are considered. The equations of motion for the probability amplitudes of the four states are then obtained. And the analytical expression of the cross section for the LIn this paper a four level model of laser induced collisional energy transfer (LICET) is presented in which the effects of the two intermediate states are considered. The equations of motion for the probability amplitudes of the four states are then obtained. And the analytical expression of the cross section for the LICET transition is derived. The results of numerical calculations in Eu-Sr and Cs-Sr systems show that the conventional three level theory cannot be expected to provide an adequate description of the cross section of the LICET transition if the frequency difference ｜ω21｜ is comparable to the frequency difference ｜ω43｜. But the four-level model can be used to describe the LICET process in all cases..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1563 (1996)
Mode Competition in Miniature Optically Pumped NH3Far Infrared Laser
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The semiclassical density matrix equation of four energy levels was solved. Then by means of iteration method, the output power increment ratio of V 2∶a→s P(5, 4) to a→s Q(5, 4) transition in miniature optically pumped NH 3 molecules far infrared superradiant laser (mini NH 3 OPFIRL), which was pumped by CO 2 10R(6) liThe semiclassical density matrix equation of four energy levels was solved. Then by means of iteration method, the output power increment ratio of V 2∶a→s P(5, 4) to a→s Q(5, 4) transition in miniature optically pumped NH 3 molecules far infrared superradiant laser (mini NH 3 OPFIRL), which was pumped by CO 2 10R(6) line, was calculated. The calculation showed that the mode competition between the V 2∶a→s P(5, 4) and V 2∶a→s Q(5, 4) in superradiant mini NH 3 OPFIRL led to the elimination of V2:a→s P(5，4) and V2:a→s S(5，4) in superradiant mini-NH3-OPFIRL led to the elimination of V2:a→s P(5，4) transition branch. The theoretical calculation was consistent with the experimental result..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1570 (1996)
Thin Films
Fabrication and Optical Nonlinearities of Langmuir-Blodgett Multilayers of 1-Benzyl-9-Hydrofullerence-60
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The structural features of the LB films of substituted fullerence C60-Be were investigated by π-A isotherm, small angle X-ray diffraction (SAXD) and optical measurements. We found that pure C60-Be molecules existed at the air-water interface in a bulk phase. NC was used as an inert material to construct mixed C60-Be/NCThe structural features of the LB films of substituted fullerence C60-Be were investigated by π-A isotherm, small angle X-ray diffraction (SAXD) and optical measurements. We found that pure C60-Be molecules existed at the air-water interface in a bulk phase. NC was used as an inert material to construct mixed C60-Be/NC LB films which had a much better qulity than the pure C60-Be LB films. Our π-A, UV-visible absorption and SAXD measurements showed that the structural improvement in the mixed C60-Be/NC LB films was realized by insertion of the C60-Be molecules between the two hydrophobic chains of the NC molecules. The relatively large third-order nonlinear susceptivility χ(3)＝2.1×10-11 esu was deduced by measuring THG from mixed C60-Be/NC LB films. The NC molecules have attractive features as an inert material in fabrication of LB multilayers made from optically nonlinear materials with hydrophobic long tails or ball-like structures..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1600 (1996)
Dual Interference Effects from a Single Layer Film Substrate System and Their Applications
[in Chinese], and [in Chinese]
The theory of dual interference effects (DIFE) from a single layer film and a substrate is proposed in this paper, the related mathematical expressions are obtained. The exprimental results have shown that our theoretical analysis is correct. As the result of DIFE, the thermo induced light intensity reflecting modulatiThe theory of dual interference effects (DIFE) from a single layer film and a substrate is proposed in this paper, the related mathematical expressions are obtained. The exprimental results have shown that our theoretical analysis is correct. As the result of DIFE, the thermo induced light intensity reflecting modulation depth is as high as 80%. The effects are expected to have widely potential applications..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1607 (1996)
Transmitted Second Harmonic Generation in Langmuir Blodgett Monolayer with Variable Angle of Incidence
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A theoretical expression of reflected and transmitted second harmonic generation (SHG) with different polarization combinations on a Langmuir Blodgett monolayer in front geometry and back geometry were given as a function of incident angle. Transmitted SHG signals were measured on a stilbazium salt LB monolayer with vaA theoretical expression of reflected and transmitted second harmonic generation (SHG) with different polarization combinations on a Langmuir Blodgett monolayer in front geometry and back geometry were given as a function of incident angle. Transmitted SHG signals were measured on a stilbazium salt LB monolayer with variable angle of incidence. It showed that the molecular second order polarizability β and molecular tilt angle 〈ψ〉 could be obtained by transmitted SHG measurement using only one polarization combination, provided that the variable angle measurement was made under a full 360 degree range. This a new method for obtaining molecular β and 〈ψ〉 in LB monolayer by SHG..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1612 (1996)
Vision, Color, and Visual Optics
A Study of Computer Color Matching Prediction Algorithm
[in Chinese], and [in Chinese]
A tristimulus value match algorithm for computer automatic color matching is developed. The algorithm is based on the single constant form of color prediction theory Kubelka Munk law. The experiment on textiles gives the result that satisfactory color recipes of ΔE less than 0.10 CIELAB can be obtained with this algoriA tristimulus value match algorithm for computer automatic color matching is developed. The algorithm is based on the single constant form of color prediction theory Kubelka Munk law. The experiment on textiles gives the result that satisfactory color recipes of ΔE less than 0.10 CIELAB can be obtained with this algorithm..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 16, Issue 11, 1657 (1996)
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