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RSS1991 Vol. 15, No. 3
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1991, 15(3): 129-133.
[Abstract]
[PDF 238KB]
Abstract:
A new design and preparation technique about the anti-reflective coating for SHG of KTP(KTiOPO4) crystals are introduced. The coating is composed of three different films with identical thickness.The preparation is relatively easy, with high reproducibility. The residual reflectivity of both 1.064μm and 0.532μm has been reduced to as low as 0.15%~0.20%.
A new design and preparation technique about the anti-reflective coating for SHG of KTP(KTiOPO4) crystals are introduced. The coating is composed of three different films with identical thickness.The preparation is relatively easy, with high reproducibility. The residual reflectivity of both 1.064μm and 0.532μm has been reduced to as low as 0.15%~0.20%.
1991, 15(3): 133-138.
Abstract:
The theory analysis and experimental setup of the optical image addition, subtraction, intensity inversion and dynamic tracking display are presented. The experimental setup is a Michelson interferometer containing two four-wave-mixing phase conjugate mirrors. The experimental results are well accordant with the theory analysis.
The theory analysis and experimental setup of the optical image addition, subtraction, intensity inversion and dynamic tracking display are presented. The experimental setup is a Michelson interferometer containing two four-wave-mixing phase conjugate mirrors. The experimental results are well accordant with the theory analysis.
1991, 15(3): 139-141.
Abstract:
The effect of electron interaction on gain of a free-electron laser pumped with a helical magnetic field is formulated.
The effect of electron interaction on gain of a free-electron laser pumped with a helical magnetic field is formulated.
1991, 15(3): 142-144.
Abstract:
In this paper, a method and an experiment of measuring the frequency-shift of a He-Ne laser are described.The relationship of the mini-extension of the cavity length and frequency shift is discussed in detall.In the experiment, a interferometer with liquidcore optical fiber is used.
In this paper, a method and an experiment of measuring the frequency-shift of a He-Ne laser are described.The relationship of the mini-extension of the cavity length and frequency shift is discussed in detall.In the experiment, a interferometer with liquidcore optical fiber is used.
1991, 15(3): 145-149.
Abstract:
The calculation formula of the spectroscopic intensity parameters, such as line intensity, oscillator strengths (fij),intensity para-meters Ω(2,4,6), transition probability of electron dipole and branch ratio, are derived by using Judd-Ofelt theory. According to the results of measuring the absorption and fluorescence spectra of Nd3+ in LaMgAl11010crystal, these parameters are calculated and well accordant with several methods.
The calculation formula of the spectroscopic intensity parameters, such as line intensity, oscillator strengths (fij),intensity para-meters Ω(2,4,6), transition probability of electron dipole and branch ratio, are derived by using Judd-Ofelt theory. According to the results of measuring the absorption and fluorescence spectra of Nd3+ in LaMgAl11010crystal, these parameters are calculated and well accordant with several methods.
1991, 15(3): 149-153.
Abstract:
By using the impulse response function, the effects of aberration of optical head and the servoerror of the optical storage system on SNR of the read-out signal are discussed. The aberration tolerance and the servo-requirement for various optical head are presented.
By using the impulse response function, the effects of aberration of optical head and the servoerror of the optical storage system on SNR of the read-out signal are discussed. The aberration tolerance and the servo-requirement for various optical head are presented.
1991, 15(3): 154-157.
Abstract:
Misalignment sensitivity D of a three-mirror cavity with misaligned elements is formulated.The variation of D with the parameters of the cavity is numerically discussed.
Misalignment sensitivity D of a three-mirror cavity with misaligned elements is formulated.The variation of D with the parameters of the cavity is numerically discussed.
1991, 15(3): 158-161.
Abstract:
The steel net attenuator of CO2 laser and its performance are introduced. Using the attenuator, the results of studying the ocular damage threshold are reported in the paper.
The steel net attenuator of CO2 laser and its performance are introduced. Using the attenuator, the results of studying the ocular damage threshold are reported in the paper.
1991, 15(3): 162-166.
Abstract:
High density (greater than 1016cm-3) F2+ centers can be effectively created in a colored LiF crystal irradiated with a nitrogen laser (λ=337nm) at room temperature.The performance of F2 and F2+ centers LiF crystal laser has been investigated by using a three-mirror optical cavity to compensate the astigmation.The experiments show that the stable F2+ center laser operation can be obtained by using a nitrogen laser as a processing beam.
High density (greater than 1016cm-3) F2+ centers can be effectively created in a colored LiF crystal irradiated with a nitrogen laser (λ=337nm) at room temperature.The performance of F2 and F2+ centers LiF crystal laser has been investigated by using a three-mirror optical cavity to compensate the astigmation.The experiments show that the stable F2+ center laser operation can be obtained by using a nitrogen laser as a processing beam.
1991, 15(3): 166-171.
Abstract:
Amorphous hydrogenated silicon (a-Si:H) film have been produced by laser chemical vapor deposition, there a 50W CO2 laser is used to excite silane (SiH4). Deposition rate up to 200/min is achieved. The films are confirmed to be amorphous. The ratio of measured photo-conductivity and dark-conductivity of the films reaches 104 orders of magnitudes visible spectroscopic techniques. Value of optical gap is of 1.44~2.00eV. Deposition rate, photo-conductivity,dark-conductivity and optical gap, as the function of substrate temperature,are obtained. The chemical vapor deposition mechanism of a-Si:H film is described.
Amorphous hydrogenated silicon (a-Si:H) film have been produced by laser chemical vapor deposition, there a 50W CO2 laser is used to excite silane (SiH4). Deposition rate up to 200/min is achieved. The films are confirmed to be amorphous. The ratio of measured photo-conductivity and dark-conductivity of the films reaches 104 orders of magnitudes visible spectroscopic techniques. Value of optical gap is of 1.44~2.00eV. Deposition rate, photo-conductivity,dark-conductivity and optical gap, as the function of substrate temperature,are obtained. The chemical vapor deposition mechanism of a-Si:H film is described.
1991, 15(3): 171-175.
Abstract:
A high sensitivity semiconductor thermoelectric module is used in a optical radiation detector to detect temperature changes of the sensor. The module has a sensitivity near 380μV/℃ per pair of thermoelements, being ten times as high as the voltage output per pair of thermoelements of the metalwire thermopiles. The thermoelectric module has been applied successfully in all types of laser energy metres.
A high sensitivity semiconductor thermoelectric module is used in a optical radiation detector to detect temperature changes of the sensor. The module has a sensitivity near 380μV/℃ per pair of thermoelements, being ten times as high as the voltage output per pair of thermoelements of the metalwire thermopiles. The thermoelectric module has been applied successfully in all types of laser energy metres.
1991, 15(3): 180-185.
Abstract:
In this paper, the development of laser distance measuring technology at home and abroad is introduced, the scientific research and the manufacture of the prominent precision laser optical distance measuring instruments and other laser measuring instruments for almost thirty years are enumerated, the principal properties and characters of these instruments, the wide application and the developing prospects in various fields of celestial body survey, geodetic survey and engineering building survey are analysed in detail, and the necessity of exploitation and manufacture of short range laser rangefinders in our country are pointed out as well.
In this paper, the development of laser distance measuring technology at home and abroad is introduced, the scientific research and the manufacture of the prominent precision laser optical distance measuring instruments and other laser measuring instruments for almost thirty years are enumerated, the principal properties and characters of these instruments, the wide application and the developing prospects in various fields of celestial body survey, geodetic survey and engineering building survey are analysed in detail, and the necessity of exploitation and manufacture of short range laser rangefinders in our country are pointed out as well.
1991, 15(3): 186-192.
Abstract:
Fiber optic communication market states in 1980s and the tendency in a period from now on are described with a great deal of tables and data. Suggestions on development of our country's fiber optic communications are made.
Fiber optic communication market states in 1980s and the tendency in a period from now on are described with a great deal of tables and data. Suggestions on development of our country's fiber optic communications are made.
