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RSS1993 Vol. 17, No. 1
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1993, 17(1): 1-5.
[Abstract]
[PDF 547KB]
Abstract:
A picosecond dye laser synchronously pumped by an active mode-locked and Q-switched Nd:YAG laser is reported. Tunable laser pulses with pulse duration of 70ps, pulse energy of 0.1μJ and tunable range of 580～610 nm have been generated from this dye laser. The temporal and frequency characteristics of the laser, especially, the influences of the cavity length mismatch on the pulse duration and the center pulse wavelength are studied.
A picosecond dye laser synchronously pumped by an active mode-locked and Q-switched Nd:YAG laser is reported. Tunable laser pulses with pulse duration of 70ps, pulse energy of 0.1μJ and tunable range of 580～610 nm have been generated from this dye laser. The temporal and frequency characteristics of the laser, especially, the influences of the cavity length mismatch on the pulse duration and the center pulse wavelength are studied.
1993, 17(1): 6-10.
Abstract:
A tri-frequency dye laser with coaxial and synchronous output is developed and can be tuned in the range of 554～667 nm when R560/DCM alcohol solution is used. It is easy to adjust the power ratio of three wavelengths to be 1:1:1 in the range of 560～640nm on the basis of correlated tuning principle. An amplifier operation with high power is also achieved.
A tri-frequency dye laser with coaxial and synchronous output is developed and can be tuned in the range of 554～667 nm when R560/DCM alcohol solution is used. It is easy to adjust the power ratio of three wavelengths to be 1:1:1 in the range of 560～640nm on the basis of correlated tuning principle. An amplifier operation with high power is also achieved.
1993, 17(1): 11-15.
Abstract:
This paper analyzes the operation theory, experimental set, cavity design and design parameters of the active-mode-locked Q-switched YAG laser, and introduces the performance characteristics of the single mode-locked laser and mode-locked Q-switched laser, respectively.
This paper analyzes the operation theory, experimental set, cavity design and design parameters of the active-mode-locked Q-switched YAG laser, and introduces the performance characteristics of the single mode-locked laser and mode-locked Q-switched laser, respectively.
1993, 17(1): 16-22.
Abstract:
The operational mechanism of a acoustic-optical modulated cavity dumping Nd:YAG laser has been researched and analysed systematically in this paper. The stable state(buildup period) and unstable state (dumping. period) rate equations are built in this paper. In connection with optimum parameters in continuous operated Nd:YAG laser, the analytic and numerical solutions of the partical and phonton field are derived from the rate equations Effece of a acoustic-optical modulated specification upon laser pulse specification has been discussed in details.
The operational mechanism of a acoustic-optical modulated cavity dumping Nd:YAG laser has been researched and analysed systematically in this paper. The stable state(buildup period) and unstable state (dumping. period) rate equations are built in this paper. In connection with optimum parameters in continuous operated Nd:YAG laser, the analytic and numerical solutions of the partical and phonton field are derived from the rate equations Effece of a acoustic-optical modulated specification upon laser pulse specification has been discussed in details.
1993, 17(1): 23-26.
Abstract:
The lower peak power, the large divergence angle and the low repetition frequency of the Nd:YAG laser with the parallel plane resonator, which is used as a ranging light source in most small sized handheld laser rangefinders, restrict the performances of those rangefinders to a certain extent. A plane-convex unstable resonator by which both pulse width and divergence angle can be decreased and a new high thermal efficiency Ce and Nd doped YAG crystal have been designed for a laser which a single laser pulse output with an energy of 18.6mJ, a pulse width of 5 ns,a divergence angle of 0.6 mrad and a peak power of 3.7 MW has been obtained.
The lower peak power, the large divergence angle and the low repetition frequency of the Nd:YAG laser with the parallel plane resonator, which is used as a ranging light source in most small sized handheld laser rangefinders, restrict the performances of those rangefinders to a certain extent. A plane-convex unstable resonator by which both pulse width and divergence angle can be decreased and a new high thermal efficiency Ce and Nd doped YAG crystal have been designed for a laser which a single laser pulse output with an energy of 18.6mJ, a pulse width of 5 ns,a divergence angle of 0.6 mrad and a peak power of 3.7 MW has been obtained.
1993, 17(1): 27-31.
Abstract:
1993, 17(1): 36-39.
Abstract:
In general, this paper described the measuring methods for the laser parameters, and emphasizes the developed methods and techniques in recent years.
In general, this paper described the measuring methods for the laser parameters, and emphasizes the developed methods and techniques in recent years.
1993, 17(1): 40-43.
Abstract:
In this paper, we review the progress of the technology of the diffusion-cooled RF exited large-area discharge CO2 lasers, reveal the advantages in combination of the technique with the nnstable waveguide hybrid resonator, and show the future of the lasers.
In this paper, we review the progress of the technology of the diffusion-cooled RF exited large-area discharge CO2 lasers, reveal the advantages in combination of the technique with the nnstable waveguide hybrid resonator, and show the future of the lasers.
1993, 17(1): 44-49.
Abstract:
The purpose of the paper is to provide a fast speed multiplying correlation algorithm which is realized by using TMS32020 high speed signal processor. The method adopts the square enhancement, coarse-fine searching and adaptive threshold technique to remove the unmatched points and improve matching accuracy. The results of the computer simulation shows that, under the condition of low SNR, the algorithm is especially useful.
The purpose of the paper is to provide a fast speed multiplying correlation algorithm which is realized by using TMS32020 high speed signal processor. The method adopts the square enhancement, coarse-fine searching and adaptive threshold technique to remove the unmatched points and improve matching accuracy. The results of the computer simulation shows that, under the condition of low SNR, the algorithm is especially useful.
1993, 17(1): 50-52.
Abstract:
In this paper, a method for measuring the temperature coefficient of liquid refractive index by means of the optical fiber interference is introduced. In the experiment study, the liquid-core optical fiber is used. The study results show the high measurement accuracy.
In this paper, a method for measuring the temperature coefficient of liquid refractive index by means of the optical fiber interference is introduced. In the experiment study, the liquid-core optical fiber is used. The study results show the high measurement accuracy.
1993, 17(1): 53-57.
Abstract:
The main technique of the diode-pumped solid laser is studied in this paper. It is emphasizes that at the lower pumping power, a nearly hemispherical cavity or big R cavity should be chosen to decrease the threshold of the laser, and at the higher pumping power a hemiconfocal cavity should be chosen to increase the output power and improve the lransformation efficiency. The designs of the coupled optical system should satisfy the mode match requirement of the laser cavity and pumping beams. The 8.3roW output power of TEM00 mode is obtained at the 86.4mW pumping power for Nd:YAG laser, the laser threshold is 12 mW.
The main technique of the diode-pumped solid laser is studied in this paper. It is emphasizes that at the lower pumping power, a nearly hemispherical cavity or big R cavity should be chosen to decrease the threshold of the laser, and at the higher pumping power a hemiconfocal cavity should be chosen to increase the output power and improve the lransformation efficiency. The designs of the coupled optical system should satisfy the mode match requirement of the laser cavity and pumping beams. The 8.3roW output power of TEM00 mode is obtained at the 86.4mW pumping power for Nd:YAG laser, the laser threshold is 12 mW.
1993, 17(1): 58-61.
Abstract:
This paper emphasizes the influence of additional SF6 and He on TE N2 laser output at 3371Å. The experimental results show that the laser output power can be increased about 2 times, by adding SF6 in pure N2, and when the ratio of N2:He is 1:2～1:3, the laser output will be increased by 30%～70%. The influences of the additional He on the electron temperature, electron density and electron energy distribution are also studied. Therefore, the fact that the additional gas can improve the laser output is reasonably explained.
This paper emphasizes the influence of additional SF6 and He on TE N2 laser output at 3371Å. The experimental results show that the laser output power can be increased about 2 times, by adding SF6 in pure N2, and when the ratio of N2:He is 1:2～1:3, the laser output will be increased by 30%～70%. The influences of the additional He on the electron temperature, electron density and electron energy distribution are also studied. Therefore, the fact that the additional gas can improve the laser output is reasonably explained.
