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Characteristics Investigation Of Solid State Laser By LDA Side Pumped And It's Frequency Transform

Posted on:2007-02-25Degree:MasterType:Thesis
Country:ChinaCandidate:W Y ChengFull Text:PDF
GTID:2178360182497715Subject:Optics
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Diode-pumped solid-state lasers (DPSSL, or DPL) have become a developingfocus in novel solid-state lasers and have wide applications in material processing,military, medical therapeutics, basic research, etc. Due to their advantages, such as highefficiency, compactness, stability, long lifetime and all solid-state construction,high power solid-state lasers are becoming mainstream lasers, and high-power LDpumped green laser has become the researching emphasis because its potentialapplications in material processing, laser isolation of uranium isotopes, etc. The laserwith output wavelength at 1570nm is widely used in range finding because they arerelatively safe to people's eyes. Optical Parametric Oscillator (OPO) pumped by1064nm Nd:YAG laser at 1570nm is one of the most effective way to get the eye-safelaser.A high-power LDA side-pumped Nd:YAG/KTP green laser and OPO are reportedtheoretically and experimentally.The content of this dissertation is as follows:1. The history and development of all solid state lasers are reviewed;lasercrystals suitable for LD pumping and their main performances areintroduced, then the research statue of frequency-doubling laser and1570nm wavelength eye-safe laser are summarized.2. The characteristics of Nd:YAG crystal and Nd:YAG module by LDAside-pumped are introduced;and the thermal effect of YAG rod is studiedexperimentally;the phase matching properties of the negative dual-axiscrystal is researched, and the phase matching of KTP crystal at 1064nmis discussed in the second chapter.3. Considering the thermal effect, selecting KTP as the frequency-doublingcrystal , the LDA side-pumped Nd:YAG continuous lasers are studiedtheoretically and experimentally;The green laser is experimented bylinear cavity,V type cavity and Z type cavity respectively;the thresholdcurrency of 6.6A with linear cavity, the CW output power of 532 nm isachieved at 2.8 W with the incident currency of 19A, and theelectro-optical efficiency is 0.71%;the threshold incident currency is7.5A with V type cavity, and the output power of 532 nm is 3.264 W withthe incident currency of 17A and the electro-optical efficiency is 0.932%;while the incident currency is 14A with Z type cavity, and the outputpower of 532 nm is 3.75W with the incident currency of 23A and theelectro-optical efficiency is 0.77%.4. 1570nm quasi-continuous laser is realized by puttingnon-critical-phase-matched KTP into LDA side-pumped Nd:YAG AOQ-switched laser which constructed an intra-cavity OPO;at the incidentcurrent of 14.5 A , 1570 nm output power of 1.748W is produced withthe frequency of 10kHz, the output coupler transmission is 15%.
Keywords/Search Tags:LDA side-pumped DPSSL, Intra-cavity frequency-doubled, KTP, AO Q-switched, Intra-cavity OPO
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