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Research on the KTP Crystal Applied in THG of Nd:YAN 1319nm Laser

Author: ZhangAn
Tutor: WenWuZuo
School: Tianjin University
Course: Photonics technology
Keywords: KTP Tripler 440nm Blu-ray Walk-off angle Phase-matching angle
CLC: TN248
Type: Master's thesis
Year: 2010
Downloads: 101
Quote: 0
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Abstract


All-solid-state laser with a small size , compact structure , long life, high efficiency series of advantages it has broad application prospects and great potential value . The all - solid-state blue laser in biological engineering, large-screen laser show , laser medical , underwater communications , and many areas have important applications . KTP crystal as a nonlinear optical crystal with an integrated performance applied to 1319nm at the third harmonic is extremely important theoretical and practical significance . In this thesis KTP crystal is applied under normal temperature conditions 1319nm laser frequency doubling 440nm Blu-ray theoretical analysis , the problems encountered and the experimental process research and resolve . The experimental apparatus LD end-pumped Nd : YAG / KTP the / of KTP full solid-state laser the straight cavity structure . Main elements: ( 1 ) used in the experiment Nd : YAG and KTP crystal performance are introduced , and the KTP crystal used in the 1319nm laser third harmonic of the advantages described . (2 ) According to the biaxial crystal phase matching theory KTP crystal used in the 1319nm laser octave and third harmonic phase-matching angle with the size of the effective nonlinear coefficient calculated to determine the two KTP crystal cutting angle . ( 3) The calculation and analysis of the octave and third harmonic generation process laser crystal walkoff , and presented and discussed in detail the walk-off compensation , reduce the walk -off angle , the effect is more obvious compensation before and after the experiment . (4) using a rotating crystal and a temperature adjusting method of matching the size of the angle of the KTP crystal phase at tripler studied, to determine the optimum phase matching direction and the optimum working temperature of the crystal , and then cut crystal , 440nm laser the output intensity has been significantly improved . The innovation: for the first time under normal temperature conditions using critical phase matching KTP crystal 1319nm laser third harmonic experiments envisaged ; computer programming for the first time the method of calculation of the main parameters of the laser frequency tripling process KTP crystal , such as phase-matching angle , effective nonlinear coefficient , walk-off angle , experimental method was adopted to obtain a KTP crystal interaction length , angle divergence angle and crystal allows ; 1319nm tripler at best phase matching angle (experimental value ).

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser
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