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Study On Laser Pulse Of Subnanosecond At 1064nm By Passively Q Switching

Posted on:2016-03-30Degree:MasterType:Thesis
Country:ChinaCandidate:L WangFull Text:PDF
GTID:2308330479998537Subject:Optics
Abstract/Summary:PDF Full Text Request
The diode-pμmped solid state laser of subnanosecond with high peak power is widely used in laser radar,medical treatment,nonlinear optics and scientific research. It especially dominates the laser processing because of the high precision,small heat effected area and faster cooling rate. Theoretical and experimental research is carried on by passively Q switched in order to obtain the laser source of 1064 nm with pulse duration of subnanosecond.Firstly, the energy level structure and spectral property is introduced briefly. On the basis of the saturable absorption property of Cr:YAG, the relationship between the transmission of Cr:YAG and the power intensity is studied by simulation at different initial transmission of Cr:YAG.The expressions of the laser pulse energy,peak power and pulse duration are obtained by solving the rate equation of passively Q-switching. From the expression of the pulse duration, the influence of the reflectivity of output mirror,the initial transmission of Cr:YAG and the cavity length on the pulse duration is studied as well as the influence reflectivity of output mirror on the pulse energy and peak power.The influence of the cavity length,the transmission of the output mirror and the initial transmission of Cr:YAG on the pulse duration,the influence of the transmission of output mirror on the pulse energy and peak power,the influence of the initial of Cr:YAG on the pulse energy and peak power have been studied in the experiment.The Nd:YAG/Cr:YAG passively Q switched laser end pumped by diode laser have been designed and developed. The laser with pulse duration of 0.99 ns and pulse energy of 450μJ and bandwith of 0.0624 nm is achieved at the pumping of 370μs and 29 W at 500 Hz,The optical-otpical efficiency is 4.2%...
Keywords/Search Tags:LD pulse pumping, passively Q-switching, subnanosecond
PDF Full Text Request
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