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Research On LD Pumped All-Solid-State Passively Mode-Locked Lasers

Posted on:2012-08-24Degree:MasterType:Thesis
Country:ChinaCandidate:Y SongFull Text:PDF
GTID:2178330335950567Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
With the wide application of ultrashort pulses in the military, industrial, and medical care, the generation of ultrashort pulses has become an important topic in the laser field, especially the passively mode-locked ultrashort pulse technology is one of the hottest research point now. In this paper, the thermal focal length of different crystals which are end-pumped solid-state are measured experimentally, and three different experimental plan of passive mode locking are researched. Main tasks as follows:StepⅠ, stable resonator method is used for measuring thermal focal length of Nd: YAG and Nd:YVO4, in order to obtain the accurate results of thermal focal length in experiment and make the design of thermal stability resonator more accurate. StepⅡ, it calculates the range of stable region of resonator by ABCD matrix method and simulates the path of light in resonator, Which is very effective to optimizing the resonator parameters. StepⅢ, a variety of passively mode-locked plan are studied systematically. First, Cr:YAG is used for studying the Nd:YVO4 Q-mode-locked laser, which achieves the Q-mode-locked laser output with the wavelength of 1.06μm. Second, using Semiconductor Saturable Absorber Mirror (SESAM) gains a stable continuous mode-locked pulses in 1.06μm. The repetition rate is 139MHz, and the thermal lens effect does not appear when the pump power is under the limit of 30W.Third, a new kind of saturable absorber Single Wall Carbon Nanotube Absorber (SWNT-SA) is used to obtain a mode-locked laser output with the wavelength of 1.06μm, the maximum power of 3.71W and the continuous repetition rate of 158MHz.
Keywords/Search Tags:All Solid State Laser, Passively mode-locking, Cr:YAG, SESAM, Carbon Nanotube
PDF Full Text Request
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