Contents
1988
Volume: 8 Issue 4
18 Article(s)
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Research Article
Fourier Optics and Signal Processing
Imaging X-ray source by using toroidel mirror
FENG XIANPING, XU ZHIZHAN, and ZHANG ZHENQUAN
We give a detailed theoretioal analysis of X-ray optics and point out that it is possible to image X-ray source in grazing incidence manner. By using a toroidal mirror and a concave mirror, a picture of X-ray source from laser produced plasma was taken and same results were consistent with theoretical analysis. The expWe give a detailed theoretioal analysis of X-ray optics and point out that it is possible to image X-ray source in grazing incidence manner. By using a toroidal mirror and a concave mirror, a picture of X-ray source from laser produced plasma was taken and same results were consistent with theoretical analysis. The experimental result shows that this method is applicable to X-ray optics..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 348 (1988)
Instrumentation, Measurement and Metrology
Opto-acoustic power monitor with high sensitivity
WU JIHUA, and WU HONGYUE
A new type of laser power monitor based on opto-aooustio effect is described in this paper. The spectral response rang es from UV to IK. In visible spectral region, the responsibility of the monitor is aboat 26 μV/μW, the minimum detectable power is 0.2μV/μW, and the linear dynamic range is over 104.A new type of laser power monitor based on opto-aooustio effect is described in this paper. The spectral response rang es from UV to IK. In visible spectral region, the responsibility of the monitor is aboat 26 μV/μW, the minimum detectable power is 0.2μV/μW, and the linear dynamic range is over 104..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 354 (1988)
Integrated Optics
Birefringent fiberoptic pressure sensor with high sensitivity
XIE haiming
This paper describes a birefringent fiber-optic pressure sensor with high sensitivity and simple structure. The disturbance of environmental temperature doesn t affect its sensitivity. Pressure-versus-temperature sensitivity ratio is about 53(K·bar-1). The temper ature sensitivity is only 1/7.5 of that of "PaThis paper describes a birefringent fiber-optic pressure sensor with high sensitivity and simple structure. The disturbance of environmental temperature doesn t affect its sensitivity. Pressure-versus-temperature sensitivity ratio is about 53(K·bar-1). The temper ature sensitivity is only 1/7.5 of that of "Panda" fiber..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 332 (1988)
Theoretical analysis of the prism-leaky waveguide coupler
JING FENG
According to the multi-beam interference principle, the prism-leaky waveguide coupler was analysed theoretically, and compared with the prism-waveguide coupler. Oriterions for properly using those two kinds of couplers were also given. Analysis results show that the prism-leaky waveguide coupler can be used for measuriAccording to the multi-beam interference principle, the prism-leaky waveguide coupler was analysed theoretically, and compared with the prism-waveguide coupler. Oriterions for properly using those two kinds of couplers were also given. Analysis results show that the prism-leaky waveguide coupler can be used for measuring parameters of the thin films and input-output coupling of the optical waveguide as operated substantially under strong coupling conditions. For weak coupling, our results agreed with Tien and Ulrioh's theoretical analyses..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 337 (1988)
Lasers and Laser Optics
Induced polarization of a casecade-type three-level atom
ZHU SHIYAO, ZHOU LICHONG, and MA AIQUN
The induced polarization of a caseoade-type threeevel atom interacting with two light fields is studied using semiolassical method. Using eigenfuotion and eigenvalues, the wavefunction of the atom at arbitrary time and the formula for polarization are obtained. The spectral distribution and relative strength of the polThe induced polarization of a caseoade-type threeevel atom interacting with two light fields is studied using semiolassical method. Using eigenfuotion and eigenvalues, the wavefunction of the atom at arbitrary time and the formula for polarization are obtained. The spectral distribution and relative strength of the polarization are calculated..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 289 (1988)
Theoretical calculation of pressure dependence of spontaneous emission spectrum from XeCl B-X transition
S. B. Zhu, and Q. H. Lou
By using a quasi-equilibrium model which indicates that all the rotational lines are emitting independently and are collision-broadened to the same Lorentzian width, the numerical simulation of the spontaneous emission spectrum originated from XeGl B-X transition is given to interpret the reversal of the spectral narroBy using a quasi-equilibrium model which indicates that all the rotational lines are emitting independently and are collision-broadened to the same Lorentzian width, the numerical simulation of the spontaneous emission spectrum originated from XeGl B-X transition is given to interpret the reversal of the spectral narrowing observed at high gas pressure. The technique employed in this paper is supposed to be suitable to other diatomic exoimers as well..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 295 (1988)
Experimental study on characteristics of distributed feedback laser
Wang Runwen, Zhao Jiran, Chen Jianwen, and Pan Chenming
The radiation spectrum, temporary dynamic process and wavelength tunable characteristics of the distributed feedback laser pumped by a Q-switched and frequency doubled Nd: YAG laser have been studied. Two new effects including autoswitching whiclh narrow the output pulsewidth of distributed feedback laser light, and doThe radiation spectrum, temporary dynamic process and wavelength tunable characteristics of the distributed feedback laser pumped by a Q-switched and frequency doubled Nd: YAG laser have been studied. Two new effects including autoswitching whiclh narrow the output pulsewidth of distributed feedback laser light, and double pulse generation with the pumping power being higher than the threshold, have been found. The experimental results and analysis are presented in detail..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 302 (1988)
Relation among the interval of 4T2 and 2E zero-phonon lines and crystalfield strength parameter
LI YUNKUI
The simple linear relation between Δ (the gap between 4T2 and 2E zero-phonon lines) and parameters Dq, B. C and ΔE, (Stoke s shift), was discovered by analysis and calculations on the basis of Tanabe-Sugano matrices. The applicability of the relationship was explained on sone examples. The crystal-field strength criterThe simple linear relation between Δ (the gap between 4T2 and 2E zero-phonon lines) and parameters Dq, B. C and ΔE, (Stoke s shift), was discovered by analysis and calculations on the basis of Tanabe-Sugano matrices. The applicability of the relationship was explained on sone examples. The crystal-field strength criterion made by P. T. Kenyon was deduced and its limitation in the application was pointed out..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 359 (1988)
Nonlinear Optics
The effect of frequency shift on the stability and mode properties of stimulated scattering phase-conjugate resonators
LIU JINSONG
The effect of frequency shift on the stability and mode properties of Stimulated Scattering Phaae-Conjugate Resonators (SSPOR) has been studied by introdaoing the generalized self-consistency condition and the Stimulated Scattering Phase-Conjugate Mirror(SSPOM )s transfer matrix that has explicit variable frequency.The effect of frequency shift on the stability and mode properties of Stimulated Scattering Phaae-Conjugate Resonators (SSPOR) has been studied by introdaoing the generalized self-consistency condition and the Stimulated Scattering Phase-Conjugate Mirror(SSPOM )s transfer matrix that has explicit variable frequency..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 308 (1988)
Supernarrow resonant effect of coherent excitation atoms using mode-locked laser
HE LINSHENG
A theoretical scheme of coherent excitation atoms are proposed to explain the essence of supernarrow resonant effects, which are produced by using the mode-locked laser pulse train exciting the atoms. The expressions of the atomic density operator ρA(t) and of the signals of spectra are derived and the relevant ourves A theoretical scheme of coherent excitation atoms are proposed to explain the essence of supernarrow resonant effects, which are produced by using the mode-locked laser pulse train exciting the atoms. The expressions of the atomic density operator ρA(t) and of the signals of spectra are derived and the relevant ourves are given. The new results for the supernarrow resonant effects are also predicted. The theoretical scheme can be extended to the application for multiphoton processes..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 312 (1988)
Rapid Communications
Application of Kramers-Kronig relations for calculating phase dispersion of reflective mirrors
LIANG PEIHUI, ZHANG SHAOFENG, and WO MINZHENG
The phase dispersion of optical elements plays an important role in the generation and transmission of ultrashort pulses. In this paper we put forward a method for directly calculating the phase dispersion of reflective mirrors from reflective spectra by using Kramers-Kronig relations. Taking multi-layer dielectric coaThe phase dispersion of optical elements plays an important role in the generation and transmission of ultrashort pulses. In this paper we put forward a method for directly calculating the phase dispersion of reflective mirrors from reflective spectra by using Kramers-Kronig relations. Taking multi-layer dielectric coating and Al coating as examples, the method is analysed and discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 363 (1988)
Phase noise of semiconductor laser due to external optical feedback
YE JIAXIONG
Phase noise in semiconductor laser due to external optical feedback is investigated theoretically. The theoretical analysis introduces a feedback coupling rate K and linearized rate equations. We also derive the experssion of phase noise power spectrum density of semiconductor laser. It is shown that the phase noise spPhase noise in semiconductor laser due to external optical feedback is investigated theoretically. The theoretical analysis introduces a feedback coupling rate K and linearized rate equations. We also derive the experssion of phase noise power spectrum density of semiconductor laser. It is shown that the phase noise spectrum density shift periodicity with the length of external cavity and the peak value of power spectrum density varies considerably with the feedback coupling rate..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 368 (1988)
Optical PAM-to-PDM convertion:An application of optical critical slowing down effect
ZHONG LICHEN, and GUO YILI
In this paper, a new function that convers optical pulse amplitude modulation (PAM) to light pulse duration modulation (PDM) for a bistable optical system is proposed and observed experimentally. This PAM-to-PDM convertion is based on the optical critical slowing-down effect.In this paper, a new function that convers optical pulse amplitude modulation (PAM) to light pulse duration modulation (PDM) for a bistable optical system is proposed and observed experimentally. This PAM-to-PDM convertion is based on the optical critical slowing-down effect..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 374 (1988)
Coupling between two doubly cladding single mode fibers
CHEN ZHIHAO, and YAO HUIHAI
An accurate analytic expression of coupling coefficient between two parallel doubly cladding single mode fibers is given in this paper.The coupling coefficients as a function of normalized frequency parameter V are calculated for fibers with raised, matched, and depressed inner cladding indices. The coupling coefficienAn accurate analytic expression of coupling coefficient between two parallel doubly cladding single mode fibers is given in this paper.The coupling coefficients as a function of normalized frequency parameter V are calculated for fibers with raised, matched, and depressed inner cladding indices. The coupling coefficients as a function of normalized distance D/a are also given with different V. The formula can be used to compute both the coupling coefficients for both x-polarized modes and the coupling of y-polarized modes further. It can also be used to analyze ilie coupling beliweeri two fibers with their large refractive-index difference, as well as polarisation obaraoterlstioe of optical fiber couplers..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 379 (1988)
Spectroscopy
Relativistic multiconfiguration Dirac-Fock calculation of energy levels and oscillator strengths in a Fe XVII ion
ZHAO YONGfANG, and PAN SHOUFU
All energy levels of the 2p53s, 3p and 3d configurations and electrio dipole oscillator strengths f values of 3s-3p, 3p-3d transitions in a neon-like ion Fe XVII have been calculated by means of the relativistio multiconfiguration Dirac-Fock (MCDF) approximate method. Calculated energy levels show a good agreement withAll energy levels of the 2p53s, 3p and 3d configurations and electrio dipole oscillator strengths f values of 3s-3p, 3p-3d transitions in a neon-like ion Fe XVII have been calculated by means of the relativistio multiconfiguration Dirac-Fock (MCDF) approximate method. Calculated energy levels show a good agreement with the observations, and the MODF approximation are well suited for the calculations of energy levels in the neon-like isoeleotronio sequence. The oscillator strengths given in this paper are only theoretically prophetical values, thus far experimental values are unknown..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 319 (1988)
Diode laser probing of dynamic processes of molecules
CAI JIYE, WANG CHENXI, LIU SONGHAO, JIM O NEILL, and GEORGE FLYNN
This article presents an investigation on inelastic translation-vibration/rotation (T-V/R) energy exchange processes between hot atoms and CO2 molecules in order to introduce a new technique-infrared diode laser probing which can be used to study molecular kinetic processes including phoiodissociations, collisions and This article presents an investigation on inelastic translation-vibration/rotation (T-V/R) energy exchange processes between hot atoms and CO2 molecules in order to introduce a new technique-infrared diode laser probing which can be used to study molecular kinetic processes including phoiodissociations, collisions and chemical reactions.This technique provides about 10,000 fold improvement in resolution over the previous technique (infrared fluorescence) used in kinetic studies. In addition, it has about a factor of 10 improvement in speed and senMfcivity over the fluoresoenoe method. It provides an almoet unambiguotis probe for a given molecule, or a specific Btate of a molecule in the presence of many other molecules or molecules distributed in hardreds of different quantum statee..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 324 (1988)
Thin Films
Parameter measurement of polymer thin film with quasi-waveguide method
REN BINGFU, DING TIRNAN, and LANG WEIDAN
A new experiment for measuring the parameters of polystyrene and polyether-sulphone films using quasi-waveguide method is reported. The films were deposited on the gubstrats with the shape of prism. Leaky mode m-lines of the films were measured. The index and the thickness of the films were determined by using leaky moA new experiment for measuring the parameters of polystyrene and polyether-sulphone films using quasi-waveguide method is reported. The films were deposited on the gubstrats with the shape of prism. Leaky mode m-lines of the films were measured. The index and the thickness of the films were determined by using leaky mode equation. The birefringence of the film was obtained with the aid of different polarized laser beam. The measurement errors of the index and thickness are about ±1×10-3, and ±0.01μm respectively..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 8, Issue 4, 344 (1988)
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