作　　者： ; ; ; ; ; ; ; ; ;

机构地区： 山东大学晶体材料研究所晶体材料国家重点实验室

出　　处： 《光学学报》 2004年第4期481-484,共4页

摘　　要： 提出了将饱和吸收Cr4+ ∶YAG晶体被动调Q开关同时作为布儒斯特片在三镜V型折叠谐振腔中起像散补偿作用的腔内倍频设计方案。在连续激光二极管端面抽运情况下 ,给出了V型谐振腔结构光束束腰半径和位置、像散补偿Cr4+ ∶YAG晶体的厚度和谐振腔折光角度的设计方法以及计算公式。采用周期极化铌酸锂晶体作为倍频元件 ,由于谐振腔内的基波和谐波具有相同的偏振方向 ,避免了腔内双折射引起的绿光噪声问题 ,得到了输出稳定的序列脉冲。在连续抽运功率为 5 0 0mW时 ,得到了平均功率 4 2 . A folded 3-mirror laser resonator in which a Cr 4+∶YAG crystal is employed as a saturable absorber for passively Q-switching and a Brewster plate to compensate astigmatism was designed. The resonator has small radius of laser waists, so it is very suitable to the laser diode pumped intercavity frequency-doubling lasers with quasi-phase-matched frequency-doubler. The expressions to calculate the radius and the place of laser waist, curvature of the mirrors used in the resonator, the thickness of a Brewster plate, and folding angle of the resonator were presented. The performance of continous-wave laser diode pumped passively Q-switched PPLN intercavity frequency-doubling laser with the folded 3-mirror laser resonator was investigated. As the result that both fundamental and second harmonic waves have the same polarization, no green-noise problem exists. The pulse series of laser output are stable. The laser has the average output power 42.7 mW under the CW input power 500 mW.

关 键 词： 激光技术 被动调 激光二极管抽运 腔内倍频 周期极化 铌酸锂晶体 像散补偿

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