Contents
1993
Volume: 13 Issue 11
21 Article(s)
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Fiber Optics and Optical Communications
Equivalent Step-Index-Fiber Method for Multicladding Fibers
[in Chinese], and [in Chinese]
In this paper, an Equivalent Step-Index-Fiber Method(ESFM)has been extended to multicladding fibers. Upon defining the refractive index profile for the multicladding preform, the equivalent normalized index difference for the equivalent step-index-fiber of the preform can be exactly derived by the method so that varietIn this paper, an Equivalent Step-Index-Fiber Method(ESFM)has been extended to multicladding fibers. Upon defining the refractive index profile for the multicladding preform, the equivalent normalized index difference for the equivalent step-index-fiber of the preform can be exactly derived by the method so that varieties of transmission parameters for the fiber drawn from the preform would be predicted conveniently. Meanwhile, cutoff wavelengths of double-cladding elliptical fibers have been calculated as an example for part confirmation. Comparision between the theory and resuls form the experiment fibers, except individual cases, shows an accuracy of 5% in predicted cutoff wavelengths. As a result, for finally determining cutoff wavelengths or fiber-drawing radii of multicladding fibers, “trial and error” between fiber-drawing and cutoff-wavelength measuring procedures can be avoided in engineering practice, saving time, energy and material..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 1025 (1993)
Measurement of spatial distribution of mode coupling in high-birefringent fiber by interferometry
[in Chinese], and [in Chinese]
A interferometric scheme for measuring the spatial distribution of mode coupling in high-birefringent polarization-maintaining fiber is presented. The measurement system is composed of the modulated Michelson interferometer with a low-coherent laser diode as light source. . The distribution of mode coupling points in hA interferometric scheme for measuring the spatial distribution of mode coupling in high-birefringent polarization-maintaining fiber is presented. The measurement system is composed of the modulated Michelson interferometer with a low-coherent laser diode as light source. . The distribution of mode coupling points in high- birefringent fiber is determined by using the method of optic path scanning..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 1031 (1993)
Holography
Diffraction characteristics of screen with randomly-distributed holes under a partially coherent illumination
[in Chinese], [in Chinese], and [in Chinese]
Based on the partial coherence theory, this paper derives the formula of intensity and variance of diffraction from a screen with randomly- distributed holes. The diffraction characteristics of the screen are analysed in detail, and the effect of spatial characteristics of the source on diffractive image is discussed. Based on the partial coherence theory, this paper derives the formula of intensity and variance of diffraction from a screen with randomly- distributed holes. The diffraction characteristics of the screen are analysed in detail, and the effect of spatial characteristics of the source on diffractive image is discussed. It has been shown that the light intensity distribution of diffraction field depends on geometric characteristics of the holes and the screen, and shape and size of the light source as well. This paper also shows that under certain illumination, both average intensity and variance distributions in diffraction field will not change if the number or size of definitely-shaped holes in the screen randomly changes..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 1012 (1993)
Hybrid optoelectronic implementation of a serial multi-bit full-adder
[in Chinese], [in Chinese], and [in Chinese]
In this paper we present a design for the realization of serai multi-bit full-adders by using optical bistable switches. Principle of the operation has been demonstrated with nonlinear interference filters. Experimental results of four- bit addition are also presented.In this paper we present a design for the realization of serai multi-bit full-adders by using optical bistable switches. Principle of the operation has been demonstrated with nonlinear interference filters. Experimental results of four- bit addition are also presented..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 1017 (1993)
Rotating effect of self-imaging of gratings with cylindrical lens
[in Chinese], [in Chinese], and [in Chinese]
The modulating effect of a cylindrical lens on the self- imaging of a grating is investigated with Fourier spectrum analysis. It is found that periods and the position of the self-imaging of a grating are changed and the direction is rotated. The feature of the rotation is discussed.The modulating effect of a cylindrical lens on the self- imaging of a grating is investigated with Fourier spectrum analysis. It is found that periods and the position of the self-imaging of a grating are changed and the direction is rotated. The feature of the rotation is discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 1021 (1993)
Lasers and Laser Optics
A pulsed current solenoid wiggler
[in Chinese]
This paper analyses time character and the main parameters of a pulsed current solenoid system for wiggler field in free-electron laser and discusses the characteristics of the solenoid wiggler field.This paper analyses time character and the main parameters of a pulsed current solenoid system for wiggler field in free-electron laser and discusses the characteristics of the solenoid wiggler field..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 986 (1993)
Materials
Laser induced damage in LN crystals
[in Chinese], [in Chinese], and [in Chinese]
We have measured the surface and bulk damage thresholds as well as the multipulse accumulation effect of LN crystals. As a method of studying the damage mechanisim, nonlinear absorption process is investigated. It is found that the multiphoton absorption occurs both in bulk and surface damage processes, and is the origWe have measured the surface and bulk damage thresholds as well as the multipulse accumulation effect of LN crystals. As a method of studying the damage mechanisim, nonlinear absorption process is investigated. It is found that the multiphoton absorption occurs both in bulk and surface damage processes, and is the origin of the damages. The direct reasons that result in visible damage are the stress explosion in the bulk and the thermal melting, thermal etching and plasma emission on the surface..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 1036 (1993)
Nonlinear Optics
Analysis on the blue-green up-conversion luminescence of noncrystalline HoP5O14
[in Chinese], and [in Chinese]
This paper reports the observation of the blue-green up-conversion luminescence phenomenon of HoP5O14 noncrystalline induced by pulse DCM dye laser. From the experimental measurement, theoretical analysis and calculation on the up-conversion phenomenon, mechanism and passenges, it has shown that the up- conversion lumiThis paper reports the observation of the blue-green up-conversion luminescence phenomenon of HoP5O14 noncrystalline induced by pulse DCM dye laser. From the experimental measurement, theoretical analysis and calculation on the up-conversion phenomenon, mechanism and passenges, it has shown that the up- conversion luminescence of 5F3 and 5S2 level is resulted mainly from energy transfer between Ho3+ ions, and the up-conversion luminescence of 5G4and (5G3G)5level is caused by both of the sequential two- photon absorption of single H3+0 ion and energy transfer between H3+0 ions..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 961 (1993)
Experimental study on the transient stimulated Raman scattering of picosecond laser pulse
[in Chinese], [in Chinese], and [in Chinese]
10 picosecond pulses from a colliding pulse mode- locked Nd : YAG laser pass through a KTP crystal and pump DMSO Raman medium. The effect of lenses with different focal length, focal point location and the length of Raman medium on the transient stimulated Raman scattering studied experimentally. Energy conversion effi10 picosecond pulses from a colliding pulse mode- locked Nd : YAG laser pass through a KTP crystal and pump DMSO Raman medium. The effect of lenses with different focal length, focal point location and the length of Raman medium on the transient stimulated Raman scattering studied experimentally. Energy conversion efficiency of 45.6% and 10.5% for the forward and backward first Stokes Raman sacttering are obtained respectively. The experimental results are discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 967 (1993)
Measurements of dynamic parameters of molecules by resonant multiphoton ionization technique
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, we deduced theoretically the relation between ion current and multiphoton dynamic parameters in (3+1)RMP1 process and presented a method for obtaining three-photon absorption cross section, four-photon ionization cross section and radiationless relaxation rate by RMPI technique. The dynamic parameters ofIn this paper, we deduced theoretically the relation between ion current and multiphoton dynamic parameters in (3+1)RMP1 process and presented a method for obtaining three-photon absorption cross section, four-photon ionization cross section and radiationless relaxation rate by RMPI technique. The dynamic parameters of Rydberg states of toluene in gas phase are experimentaly measured for the first time. The results agree with the typical expected range of magnitudes..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 971 (1993)
The spatial character of the SBS-phase conjugate laser
[in Chinese], and [in Chinese]
The spatial output character of a stimulated Brillouin scattering phase conjugate resonator (SBS-PCR) is analysed by using the ray transfer matrix theory and calculated with the aid of computer program. The profile of the transfer beam with different parameters are given. The experimental results are presented to compaThe spatial output character of a stimulated Brillouin scattering phase conjugate resonator (SBS-PCR) is analysed by using the ray transfer matrix theory and calculated with the aid of computer program. The profile of the transfer beam with different parameters are given. The experimental results are presented to compare with it. Some important points for design of a SBS- PCR are discussed and the different types of resonator are proposed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 975 (1993)
Coupled dynamical equations of the increasing absorption optical bistability and it' s dynamical state situation
[in Chinese], and [in Chinese]
In this paper a set of coupled dynamical equations for describing or stimulating common features of the increasing absorption optical bistability (IAOB) is put forward in a phenomenological way. By computers analyzing, IAOB' s dynamical characteristics have been studied.In this paper a set of coupled dynamical equations for describing or stimulating common features of the increasing absorption optical bistability (IAOB) is put forward in a phenomenological way. By computers analyzing, IAOB' s dynamical characteristics have been studied..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 980 (1993)
Physical Optics
Automatic processing of interferogram from surface roughness measuring interferometer
[in Chinese], and [in Chinese]
Computer-based processing of interferogram of surface roughness measuring interferometer are introduced in the paper, in which threshold segmenting of brightness are used for binary image processing and border following for edge curve sampling.Computer-based processing of interferogram of surface roughness measuring interferometer are introduced in the paper, in which threshold segmenting of brightness are used for binary image processing and border following for edge curve sampling..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 1040 (1993)
Quantum Optics
Effect of fiber loss on soliton-effect picosecond pulse compression in optical fibers
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The effect of fiber loss on the quality of soliton-effect picosecond pulse compression is analyzed by solving the modified nonlinear Schrodinger equation numerically. The results show that fiber loss affect the performance of soliton-effect pulse compressors both qualitatively and quantitatively. The compressed pulse iThe effect of fiber loss on the quality of soliton-effect picosecond pulse compression is analyzed by solving the modified nonlinear Schrodinger equation numerically. The results show that fiber loss affect the performance of soliton-effect pulse compressors both qualitatively and quantitatively. The compressed pulse is longer with a lower peak power and a poorer pulse quality when fiber loss is taken into account. Furthermore, the optimum fiber length for maximum compression is longer than that expected in the absence of fiber loss. The effect of fiber loss on compression quality relates not only to the initial peak power but also to the initial pulse width..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 1003 (1993)
A q-analogue of the even and odd coherent states
[in Chinese], [in Chinese], and [in Chinese]
Based on the even and odd coherent states, the present paper is to construct the even and odd q-coherent states and study their important optical statistics properties (squeezing and antibunching). We have found that the squeezing may occur with the even q-coherent states but no antibunching effect. However, for the odBased on the even and odd coherent states, the present paper is to construct the even and odd q-coherent states and study their important optical statistics properties (squeezing and antibunching). We have found that the squeezing may occur with the even q-coherent states but no antibunching effect. However, for the odd q-coherent states there is antibunching but no squeezing for all finite-q values..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 1008 (1993)
Rapid Communications
Dynamics of reverse saturable absorption in copper phthalocyanine
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, we have studied the dynamic of reverse saturable absorption in copper phthalocyanine (CuPc) using the rate equation theory. The experimental demostration is given by using Q-switched YAG laser and CuPc solution. The absorption cross-section of 2.6×10-17 cm2 of triplet excited state is obtained by usIn this paper, we have studied the dynamic of reverse saturable absorption in copper phthalocyanine (CuPc) using the rate equation theory. The experimental demostration is given by using Q-switched YAG laser and CuPc solution. The absorption cross-section of 2.6×10-17 cm2 of triplet excited state is obtained by using thereotical simulation..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 1045 (1993)
The discussion of chromatism and resolving power about the orthogonal cylindrical lenses holography
[in Chinese], and [in Chinese]
This paper discussed the achromatic region, resolving power, aberration and applied range etc in orthogonal cylindrical lenses holography.This paper discussed the achromatic region, resolving power, aberration and applied range etc in orthogonal cylindrical lenses holography..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 1049 (1993)
Using space filter to improve light pipe uniformizer
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper describes a technique of using space filter in the light pipe uniformizer. With this filter, the uniformity of illumination of light pipe can be improved. Some parameters of the space filter are calculated and experimental results with it is given.This paper describes a technique of using space filter in the light pipe uniformizer. With this filter, the uniformity of illumination of light pipe can be improved. Some parameters of the space filter are calculated and experimental results with it is given..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 1052 (1993)
[in Chinese]
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 1055 (1993)
Spectroscopy
Study of Raman scattering in diamond film prepared by hot filament chemical vapor deposition
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Raman scattering of diamond films prepared by hot filament CVD method has been measured. Raman spectra (1100-1800 cm-1) of diamond films were fitted by using a nonlinear least squares method with several lineshape functions. The best fit model was obtained which indicates that 1355 cm-1 peak for graphite D-band is an iRaman scattering of diamond films prepared by hot filament CVD method has been measured. Raman spectra (1100-1800 cm-1) of diamond films were fitted by using a nonlinear least squares method with several lineshape functions. The best fit model was obtained which indicates that 1355 cm-1 peak for graphite D-band is an indispensable component of Raman structure of diamond films. The calculated curves agree well with the experimental Raman data. Moreover, with consideration of both graphite D-band and spatial line shape of Raman peak in diamond area can be explained. With further analysis of fitted parameters, quality of diamond crystalline and diamond content in diamond films can be shown. Good results in fitting several Raman spectra of diamond films indicate that the new fitting model is applicable..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 993 (1993)
A Experimental study on optical fiber pre-resonace Raman spectra
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The method and condition for obtaining pre-resonace Raman spectra by means of liquid-core optical fiber are discussed. Spectral intensity enhancement by factors of 102 to conventional sampling techniques has been measured. Pre-resonance Raman spectra of a -picolines has been observed by using 10 mW laser excitation at The method and condition for obtaining pre-resonace Raman spectra by means of liquid-core optical fiber are discussed. Spectral intensity enhancement by factors of 102 to conventional sampling techniques has been measured. Pre-resonance Raman spectra of a -picolines has been observed by using 10 mW laser excitation at longer wavelengths (514.5 nm, 488.0 nm and 454.5 nm)..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 13, Issue 11, 999 (1993)
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