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利用周期极化化学计量比掺氧化镁LiTaO3晶体(PP-MgO∶SLT),对半导体激光器(LD)端面抽运的1064-nm-Nd∶YVO4激光器进行了一阶准相位匹配(QPM)内腔倍频(ISHG)。PP-MgO∶SLT晶体长20 mm,极化周期为7.93μm(室温下),利用外加电场极化法制作,极化沿晶体的z向进行。实验中基频光波和倍频光波均沿晶体z向偏振以利用其最大的有效非线性系数。Nd∶YVO4激光器选用三镜折叠腔结构,在半导体激光器抽运功率为11 W,晶体温度为70.4℃时,产生了最大输出功率为2.1 W的连续绿光激光,光-光转换效率为19%。同时对PP-MgO∶SLT晶体外腔单程倍频下的转换效率与晶体温度间的关系进行了理论研究。实验中测得的内腔倍频的允许温度要远大于外腔单程倍频;另外,观察到随着晶体温度的变化倍频光功率出现突然下降的现象,并给出了相应的讨论。
A first-order quasi-phase-matching (QPM) cavity was fabricated on a 1064-nm-Nd: YVO4 laser with a Polarimetric ratio of Magnesium Doped LiTaO3 (PP-MgO: SLT) Frequency doubled (ISHG). The PP-MgO: SLT crystal has a length of 20 mm and a polarization period of 7.93 μm (at room temperature), which is produced by an applied electric field polarization method and polarized along the z direction of the crystal. In the experiment, both the fundamental frequency light and the frequency doubling light wave are z-polarized along the crystal to utilize its maximum effective nonlinear coefficient. The Nd: YVO4 laser uses a three mirror folded cavity structure. When the semiconductor laser has a pumping power of 11 W and a crystal temperature of 70.4 ° C, a continuous green laser with a maximum output power of 2.1 W is produced. The light-to-light conversion efficiency is 19% . At the same time, the relationship between the conversion efficiency and the crystal temperature under single pass multiplication of PP-MgO: SLT crystal was theoretically studied. The allowable temperature of the intracavity frequency doubling experimentally measured is much larger than that of the extracavitary single pass frequency. In addition, the phenomenon that the octave optical power suddenly drops with the crystal temperature is observed, and the corresponding discussion is given.