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Kinetic Simulation On DPAL And Experimental Study On SrCl2 Vapor Laser

Posted on:2013-01-08Degree:DoctorType:Dissertation
Country:ChinaCandidate:Y J WangFull Text:PDF
GTID:1118330371970160Subject:Optics
Abstract/Summary:PDF Full Text Request
Diode pumped alkali vapor lasers(DPAL), as a new class of laser device which both have the advantage of solid laser and vapor laser, also have some desirable features including the high quantum efficiency, the good optical quality of gain medium(vapor) and the narrow line-width. The SrCl2 vapor laser excited by high repetition rate pulsed discharge has the characteristics of multiple laser lines with higher efficiency and higher output power, multi-mechanism, and uniformity of the heat distribution. These lasers could find many potential applications in micro-electronic technology, medical treatment, material processing, military technology, laser cooling, directional energy transmission and so on.A brief introduction on the develop history and applications of optically pumped alkali vapor laser and strontium vapor laser was presented. On the basis of understanding and analyzing the mechanism and technical approach of DPAL, the matching condition of the spectral bandwidth of diode pump source with that of alkali metal atom D2 absorption line was illustrated, and a physical model to describe the kinetics and laser mechanism of diode pumped Rb vapor laser was established. In reference to the parameters in experiments, the influence of parameters of the pump laser, the output coupler reflectivity, the cell length, the temperature and the buffer gases on the output power and the optical-optical efficiency were analyzed.A physical model to describe the kinetic and the laser amplification processes of The MOPA (Master oscillator power amplifier) system design based on DPAL was established. By means of relative experiment parameters and the numerical method, the simulation result agrees well with that of experiment, on the basis of which the influence of some parameters such as the temperature, the pump power on the output characteristics of the system were further calculated and analyzed. A set of optimized parameters was obtained for designing an efficient diode pumped alkali laser MOPA system. The physical model of Cs atom absorption spectrum simulated the absorption spectrum of Cs D1 and D2 lines considering the effects of hyperfine splitting and pressure broadening. The hyperfine splitting induces the shift of hyperfine transition wavelength from the center wavelength. The simulation results provide an instruction for matching the spectral bandwidth of diode pump source with that of Cs D2 absorption line.Based on our previous theoretical and experimental investigations of alkaline-earth metal vapor lasers, a novel constructive discharge tube was designed, and the characteristics of a flowing He-SrCl2 vapor laser excited by HRR pulsed discharge was experimentally investigated. The multi-line output power as a function of the working temperature and the vapor pressure of SrCl2 was presented by calculating the radial temperature distribution of the laser tube. The temporal behaviors of the discharge current pulse and each laser pulses, as well as the spot mode of the laser beams are measured and analyzed under different laser output power.
Keywords/Search Tags:optically pumped alkali vapor laser, laser kinetic model, MOPA systerm, hyperfine splitting, SrCl2 vapor laser, high repetition rate pulsed discharge, temperature distribution, spot mode
PDF Full Text Request
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