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

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

doi:10.1038/s41598-018-22205-z

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

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

Authors

Tengfei Kong^{1

2}, Hongde Liu^{3

4}, Xinyu Ge¹, Da Qu^{1

2}, Shiguo Liu¹, Shaolin Chen², Ling Zhang², Yongfa Kong^{5

6

7}, Romano Rupp^{2

8}, Jingjun Xu^{9

10

11}

Affiliations

¹ School of Physics, Nankai University, Tianjin, 300071, China.
² MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Institute of Applied Physics, Nankai University, Tianjin, 300457, China.
³ School of Physics, Nankai University, Tianjin, 300071, China. liuhd97@nankai.edu.cn.
⁴ MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Institute of Applied Physics, Nankai University, Tianjin, 300457, China. liuhd97@nankai.edu.cn.
⁵ MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Institute of Applied Physics, Nankai University, Tianjin, 300457, China. kongyf@nankai.edu.cn.
⁶ R&D Center, Taishan Sports Industry Group, Leling, 253600, China. kongyf@nankai.edu.cn.
⁷ Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China. kongyf@nankai.edu.cn.
⁸ Vienna University, Faculty of Physics, A-1090, Wien, Austria.
⁹ School of Physics, Nankai University, Tianjin, 300071, China. jjxu@nankai.edu.cn.
¹⁰ MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Institute of Applied Physics, Nankai University, Tianjin, 300457, China. jjxu@nankai.edu.cn.
¹¹ Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China. jjxu@nankai.edu.cn.

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 LiNbO₃ (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/cm² in the ZrO₂ and MgO co-doped LiNbO₃ (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.