锆镁共掺杂铌酸锂晶体中的室温90°相位匹配

Room temperature 90° phase-matching in zirconium and magnesium co-doped lithium niobate crystals.

作者信息

Kong Tengfei, Liu Hongde, Ge Xinyu, Qu Da, Liu Shiguo, Chen Shaolin, Zhang Ling, Kong Yongfa, Rupp Romano, Xu Jingjun

机构信息

School of Physics, Nankai University, Tianjin, 300071, China.

MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Institute of Applied Physics, Nankai University, Tianjin, 300457, China.

出版信息

Sci Rep. 2018 Mar 1;8(1):3865. doi: 10.1038/s41598-018-22205-z.

DOI:10.1038/s41598-018-22205-z

PMID:29497110

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5832752/

Abstract

Laser has been widely used in many aspects, by now it is difficult to get each frequency that we want, and frequency conversion is an effective way to obtain different frequency laser through a nonlinear optical crystal. MgO-doped LiNbO (Mg:LN) crystal has usually been used for second harmonic generation (SHG) through temperature-matching configuration with a stove, till now a room temperature 90° phase-matching is still lacking. Here we find that the SHG of Nd:YAG laser is achieved at 26.1 °C while the optical damage resistance is higher than 6.5 MW/cm in the ZrO and MgO co-doped LiNbO (Zr,Mg:LN) crystal. Moreover, the monotonic decrease of phase-matching temperature is firstly found with the increase of doping concentration. These unusual properties may be attributed to the formation of [Formula: see text] + [Formula: see text] defect pairs. Our work suggests that Zr,Mg:LN crystal may be an attractive candidate for nonlinear optical applications.

摘要

激光已在许多方面得到广泛应用，目前难以获得我们所需的每个频率，而频率转换是通过非线性光学晶体获得不同频率激光的有效方法。掺氧化镁的铌酸锂（Mg:LN）晶体通常通过与炉体的温度匹配配置用于二次谐波产生（SHG），到目前为止仍缺乏室温90°相位匹配。在此我们发现，在ZrO和MgO共掺杂的铌酸锂（Zr,Mg:LN）晶体中，Nd:YAG激光的SHG在26.1°C时实现，同时其抗光损伤能力高于6.5 MW/cm²。此外，首次发现随着掺杂浓度的增加，相位匹配温度单调下降。这些不寻常的特性可能归因于[公式：见原文] + [公式：见原文]缺陷对的形成。我们的工作表明，Zr,Mg:LN晶体可能是用于非线性光学应用的有吸引力的候选材料。