Journals >Chinese Journal of Lasers
Contents
1996
Volume: 23 Issue 10
21 Article(s)
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Research Article
Deposition Rate of IBS Deposited Pt Films at Different Substrate Temperatures
[in Chinese], [in Chinese], and [in Chinese]
The investigation of the paper includes the measurements of the deposition rate ofPt films deposited by ion- beam sputtering at different deposition parameters andtemperatures. It was found that deposition rate increases with the increase of the substratetemeperature. Using the physical and chemical adsorption theory, The investigation of the paper includes the measurements of the deposition rate ofPt films deposited by ion- beam sputtering at different deposition parameters andtemperatures. It was found that deposition rate increases with the increase of the substratetemeperature. Using the physical and chemical adsorption theory, we discussed thisphenomenon..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 893 (1996)
A New Technique of Anti-strong-laser-damage on Photodetectors
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In order to improve the anti-strong-laser-daxnage ability of (HgCd)Te detectors, a new technique has been proposed based on Franz-Keldysh effect. And a simple automaticprotection scheme using this technique has also been given in this paper. ExperimentalresultS show that this new technique is more effective and can be In order to improve the anti-strong-laser-daxnage ability of (HgCd)Te detectors, a new technique has been proposed based on Franz-Keldysh effect. And a simple automaticprotection scheme using this technique has also been given in this paper. ExperimentalresultS show that this new technique is more effective and can be used to improve (HgCd)Te detectors' anti-strong-laser-damage ability in a large range..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 897 (1996)
Bending-induced Birefringence in Single-mode Fiberand Its Measurement
[in Chinese], [in Chinese], and [in Chinese]
In a bent single-mode fiber, lateral compressive stress under the conditions oflarge deformation induces a birefringence >β. This Permits us to conceive devices which are, for fiber optics, the analogue of fractional wave plates of classical optics. In the meantimewe designed a polarimeter to measure the bending-indIn a bent single-mode fiber, lateral compressive stress under the conditions oflarge deformation induces a birefringence >β. This Permits us to conceive devices which are, for fiber optics, the analogue of fractional wave plates of classical optics. In the meantimewe designed a polarimeter to measure the bending-induced bireflingence and realized aquarter wave plate at λ=1.55 μm with a two-turn optical fiber loop of 26 mm indiameter..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 901 (1996)
Matrix Expression for Electro-optic Deflector and Application
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Using a light ray tracing, this paper presents the matrix expression for an electrooptic deflector. It is the extension of the famous ABCD matrix expression for Gaussianoptics, but includes the possibility of considering a time-dependent element for the deflector.A Pulse shaping system is studied with theory of matrix Using a light ray tracing, this paper presents the matrix expression for an electrooptic deflector. It is the extension of the famous ABCD matrix expression for Gaussianoptics, but includes the possibility of considering a time-dependent element for the deflector.A Pulse shaping system is studied with theory of matrix optics, which is constructed mainlyby a pair of deflectors. Finally make demands on the accordance of two deflectors'parameters, synchronization precision between electronical pulses added to the deflectors, and positions of the deflectors in the pulse shaping system are presented..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 906 (1996)
Study on Stability of Embedded Polarized Optic Fiber Sensors
[in Chinese], and [in Chinese]
The polarized optic fiber sensor, which possesses the characteristics of simplestructure and high sensitjvity and can be embedded into composite materials conveniently, isvery fit to be used in arrays of smart sensors. In this paper, the stability of polarized opticfiber sensors is studied through the mode coupling chaThe polarized optic fiber sensor, which possesses the characteristics of simplestructure and high sensitjvity and can be embedded into composite materials conveniently, isvery fit to be used in arrays of smart sensors. In this paper, the stability of polarized opticfiber sensors is studied through the mode coupling characteristics of optic fibers..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 911 (1996)
DDI Method for Measuring Optical Constants of Thin Films
[in Chinese], and [in Chinese]
By a double-beam and double-wave interferometric (DDI) method, the opticalconstants of thin films, i. e. refractive index, extinction coefficient and thickness may bedetermined in infrared (3.39um) and visible (0.633 um) ranges at the same optical pathwith a tunalbe double wave He-Ne laser designed by ourselves. The meBy a double-beam and double-wave interferometric (DDI) method, the opticalconstants of thin films, i. e. refractive index, extinction coefficient and thickness may bedetermined in infrared (3.39um) and visible (0.633 um) ranges at the same optical pathwith a tunalbe double wave He-Ne laser designed by ourselves. The measuring principle andthe device are described..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 915 (1996)
Holography and Information Processing
Persistent Spectral Hole Burning at Room Temperature Based on Optical Resonances of Spherical Microparticles
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Persistent spectral hole burning was realized at room temperature for Nile Bluemolecules doped polymer microparticles based on morphology-dependent resonance. Themicropartical-based hole burning system may be promising for the development of thefrequency domain room temperature optical-storage materials.Persistent spectral hole burning was realized at room temperature for Nile Bluemolecules doped polymer microparticles based on morphology-dependent resonance. Themicropartical-based hole burning system may be promising for the development of thefrequency domain room temperature optical-storage materials..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 942 (1996)
A New Pulse Style CCD Data Processing Technology
[in Chinese], and [in Chinese]
This paper describes special synchronization requirements of CCD data system inlaser parameters mesurement, and CCD rearrangements. A pulse synchronized CCD datasystem developed in this lab very recently and its relevant software are emphasized.This paper describes special synchronization requirements of CCD data system inlaser parameters mesurement, and CCD rearrangements. A pulse synchronized CCD datasystem developed in this lab very recently and its relevant software are emphasized..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 947 (1996)
A Composite Filter for Addition and Subtraction of Images
[in Chinese], and [in Chinese]
In this paper, we introduce a composite filter for addition and subtraction ofimages. The filter consists of a Ronchi grating and an off-axis Fresnel zone plate. Thetransmission function is logic XOR operation of the Ronchi grating function and the Fresnelzone plate function. This method for images addition or subtractIn this paper, we introduce a composite filter for addition and subtraction ofimages. The filter consists of a Ronchi grating and an off-axis Fresnel zone plate. Thetransmission function is logic XOR operation of the Ronchi grating function and the Fresnelzone plate function. This method for images addition or subtraction has some advantages ofsimple optical setup, convenient adjusting and capability of processing large images. The principle of images addition and subtraction of using this filter is discussed. The fabricating method and the experimental results are reported..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 951 (1996)
Laser Physics
Experimental Studies on Amplifier Performance of Ti:sapphire
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A small-signal single-pass power gain of 14.76 and double-pass power gain of 26.31 have been measured for a Ti:sapphire amplifier. The results correspond to thesmall-signial gain coefficient being 1.81 cm-1 and the gain cross section being 2.74×10-19 cm2. The small-siginal gains for different wavelengths have beenA small-signal single-pass power gain of 14.76 and double-pass power gain of 26.31 have been measured for a Ti:sapphire amplifier. The results correspond to thesmall-signial gain coefficient being 1.81 cm-1 and the gain cross section being 2.74×10-19 cm2. The small-siginal gains for different wavelengths have been obtained. Thesaturation fluence and optimum length of Ti:sapphire have been calculated..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 865 (1996)
A Flashlamp-pumped Cr: LiCAF Laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A Flashlamped-pumped Cr: LiCAF laser is described. A slope efficiency as highas 2.20% as well as a 1.36% energy efficiency are reported. It is shown that higherconcentration of Cr+3 ions contributes to the improvement of the laser performences. Self- Q-switched operation is also observed in the experiment.A Flashlamped-pumped Cr: LiCAF laser is described. A slope efficiency as highas 2.20% as well as a 1.36% energy efficiency are reported. It is shown that higherconcentration of Cr+3 ions contributes to the improvement of the laser performences. Self- Q-switched operation is also observed in the experiment..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 870 (1996)
The Stable, Antiphase and Chaotic Laser Output of a Diode-pumped Intracavity-frequency-doubled Nd3+:YVO4Laser
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The operation characteristics of a dide-pumped intracavity-frequency-doubledNd:YVO4 laser are reported The stable.antiphase and chaotic laser output is observed The results of theoretical simulation agree very well with the observed phenomena.The operation characteristics of a dide-pumped intracavity-frequency-doubledNd:YVO4 laser are reported The stable.antiphase and chaotic laser output is observed The results of theoretical simulation agree very well with the observed phenomena..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 873 (1996)
Numerical Simulations and Experimental Research of OPO Threshold Reduction and Conversion Efficiency Improvement Via Injection-seeding
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A detailed theoretical and experimental investigation of an injection-seeded BBOoptical parametric oscillator (OPO) is undertaken. We find that the injection-seeding notonly reduces the linewidth of the laser output, but also lowers the OPO's threshold andimproves the conversion efficiency. The theoretical results A detailed theoretical and experimental investigation of an injection-seeded BBOoptical parametric oscillator (OPO) is undertaken. We find that the injection-seeding notonly reduces the linewidth of the laser output, but also lowers the OPO's threshold andimproves the conversion efficiency. The theoretical results agree with the experiments verywell..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 879 (1996)
Experimental Study on Intensity Ripple of an IntracavityMirror He-Ne Laser
[in Chinese], and [in Chinese]
Comparing laser intensity to the mode spectrum and its polarization states theintensity ripple is observed experimentlly and explained qualitatively.Comparing laser intensity to the mode spectrum and its polarization states theintensity ripple is observed experimentlly and explained qualitatively..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 885 (1996)
Gain in Non-steady State Waveguide Free Electron Lasers by Taking into Account Energy Spread
[in Chinese]
The analytic expression of gain for both frequencies in non-steady state waveguidefree electron lasers is derived by taking into account axial energy spread of electron beams. The approximate explicit expression is also given. They agree well with numericalsimulations. Based on the non-steady state gain, the necessary The analytic expression of gain for both frequencies in non-steady state waveguidefree electron lasers is derived by taking into account axial energy spread of electron beams. The approximate explicit expression is also given. They agree well with numericalsimulations. Based on the non-steady state gain, the necessary detuning of cavity length tocounteract the effect of lethargy is estimated, and the mechanism of self mode--locking isexplained clearly in time domain..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 888 (1996)
532 nm CW Laser Beam Self-pumped Phase Conjugation Induced by a Photorefractive Waveguide in Ce doped KNSBN Crystal
[in Chinese], [in Chinese], and [in Chinese]
We report CW laser beam self-pumped phase conjugation (SPPC) induced by aphotorefractive waveguide created by SPPC of CW mace- locked laser radiation inphotorefractive crystal Cu: KNSBN. After a waveguide is created in the crystal by usingthe second harmonic of a CW mode-locked Nd: YAG laser at 532 urn, self--pumped phWe report CW laser beam self-pumped phase conjugation (SPPC) induced by aphotorefractive waveguide created by SPPC of CW mace- locked laser radiation inphotorefractive crystal Cu: KNSBN. After a waveguide is created in the crystal by usingthe second harmonic of a CW mode-locked Nd: YAG laser at 532 urn, self--pumped phaseconjugation can be achieved by using the same wavelength CW laser beam at some incidenceangles where SPPC cannot be achieved by using the CW laser beam alone. The lifetime ofthe photorefractive waveguide is longer than 30 minutes under dark conditions..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 920 (1996)
Laser Frequency Upconversion from 1313 nm into 780 nm in Er3+-dopedand Er3+/Yb3+-doped Germanosilcate Single-mode Optical Fibers
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
We observed the frequency upconversion of a 1313 nm Nd:YLF laser pulseinto 780 nm through the amplified spontaneous emission (ASE) in Er3+-doped and Er3+/Yb3+-doped germanosilcate single-mode optical fibers pumped by a CW mode-locked (CW+ML) laser and a Q-switched mode-locked (QS+ML) laser, respectively. The emission aWe observed the frequency upconversion of a 1313 nm Nd:YLF laser pulseinto 780 nm through the amplified spontaneous emission (ASE) in Er3+-doped and Er3+/Yb3+-doped germanosilcate single-mode optical fibers pumped by a CW mode-locked (CW+ML) laser and a Q-switched mode-locked (QS+ML) laser, respectively. The emission at780 nm corresponds to 4I9/2-4I15/2 transition, and its pumping mechanism is accomplishedby a first step resonant two-photon absorption to 4F9/2 state, fo]lowed by a fast nonradiative relaxation to 4I9/2 state. The conversion efficiency of 1313 nm light into 780 nm light pumped by the CW+ML laser is higher than pumped by the QS+ML laser with the peak laser power being several hundred times higher..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 925 (1996)
Self-enhancement and the Photo-induced Macroscopic Fieldin Self-pumped Phase Conjugators
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A novel phenomenon of self-enhancement of reflectivity of a self-pumped Phaseconjugator during the time interval in which no light illuminates the conjugstor is observed.The response time of self-pumped phase conjugators of Ce-doped or Mn-doped pottasiumsodium strontium barium niobate (KNSBN) single-domain crystal is sA novel phenomenon of self-enhancement of reflectivity of a self-pumped Phaseconjugator during the time interval in which no light illuminates the conjugstor is observed.The response time of self-pumped phase conjugators of Ce-doped or Mn-doped pottasiumsodium strontium barium niobate (KNSBN) single-domain crystal is shortened obviously byusing an intermittent light. The qualitative explanation about experimental results is givenusing a fundamental charge carrier migration model via the measurement of photovoltaic and pyroelectric fields. Some further experiments have been done to support our analysis. The reduction of conjugation fidelity of the self-pumped phase conjugators is also explained in terms of a photo-induced internal field..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 929 (1996)
The Effect of the Ammonium Dichromate Concentration in the Post-processing on the DE of MBG Hologram
[in Chinese], [in Chinese], and [in Chinese]
The influence of the concentration of ammonium dichromate in the postprocessing on the DE of methylene blue sensitized gelatin (MBG) is investigated. The UVand IR spectra show no serious difference between the exposed films with and withoutdichromated post-processing. Little content of chromium is discovered in the X-rThe influence of the concentration of ammonium dichromate in the postprocessing on the DE of methylene blue sensitized gelatin (MBG) is investigated. The UVand IR spectra show no serious difference between the exposed films with and withoutdichromated post-processing. Little content of chromium is discovered in the X-ray spectrumof the exposed MBG. On the basis of these results, the mechanism of the formation of thehologram is discussed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 934 (1996)
Recursion Formula of Energy Levels for 4s24p2,4s4p3and 4s24p5s of Ge-like Ions
[in Chinese], and [in Chinese]
A recursion formula for the energy levels of 4s24p2, 4s4p3 and 4s24p5s of Ge-likeions has been given based on the generalization of the Perturbation expansion. It is foundthat this method is considerably simple and accurate.A recursion formula for the energy levels of 4s24p2, 4s4p3 and 4s24p5s of Ge-likeions has been given based on the generalization of the Perturbation expansion. It is foundthat this method is considerably simple and accurate..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 939 (1996)
Materials and Thin Films
Photorefractive Effect in a Doped Polymer System witha Low Glass Transition Temperature
[in Chinese], [in Chinese], and [in Chinese]
In this paper, photorefractive effect in a doped polymer system with a low glasstransition temperature (Tg) is reported. Photoconductivity of a PVK-C60 thin film has beeninvestigated and electro-optic coefficiency of a PVK-nitroazobenzene thin film has beenmeasured. Optical degenerate four-wave mixing and two-beam coupIn this paper, photorefractive effect in a doped polymer system with a low glasstransition temperature (Tg) is reported. Photoconductivity of a PVK-C60 thin film has beeninvestigated and electro-optic coefficiency of a PVK-nitroazobenzene thin film has beenmeasured. Optical degenerate four-wave mixing and two-beam coupling experiments havebeen done in the thick film of PVK-C60-nitroazabenzene-dibutyl phthalate (DBP). Thediffraction efficiency of 1. 5% for the four-wave mixing was obtained under a relatively low field of 16.4 V/μm. The experimental results reveal that the plasticizer, DBP, effectively enhanced the photorefrective effect by an orientational mechanism, and the property of the photorefractivity of the material has been improved..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 10, 955 (1996)
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