• Chinese Optics Letters
  • Vol. 20, Issue 3, 031401 (2022)
Jun Guo1, Jian Liu2, Jie Xu1, Bin Xu3, Yuchong Ding4、*, Xiaodan Wang5, Xiaodong Xu1、**, and Jun Xu2
Author Affiliations
  • 1Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
  • 2School of Physics Science and Engineering, Institute for Advanced Study, Tongji University, Shanghai 200092, China
  • 3Department of Electronic Engineering, Xiamen University, Xiamen 361005, China
  • 4Research & Development Center of Material and Equipment, 26th Research Institute, China Electronics Technology Group Corporation, Chongqing 400060, China
  • 5School of Physics Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, China
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    Abstract

    A good thermo-optic property of strontium dodeca-aluminum oxide (SrAl12O12, SRA) host material is very advantageous to the development of high-performance lasers by doping rare-earth ions for gain medium. In this work, we report on diode-end-pumped high-performance continuous-wave and passively Q-switched Nd:SRA lasers. For continuous-wave operation, a maximum output power of 6.45 W is achieved at 1049 nm with a slope efficiency of about 41.6%. Using a Y3Al5O12 (YAG) etalon, we have firstly achieved a 1066 nm laser with a maximum output power of 4.15 W and a slope efficiency of about 27%, to the best of our knowledge. For passively Q-switched operation, with Cr4+:YAG as a saturable absorber, a maximum average output power of 1.82 W was achieved with the shortest pulse width of 18.2 ns at pulse repetition rate of 22.9 kHz. The single-pulse energy and pulse peak power were 79.4 μJ and 4.3 kW. This work has further verified that the Nd:SRA crystal is very promising for high-performance laser generation.

    1. Introduction

    During past years, disordered laser material with a broadened emission spectrum has attracted great attention because of its advantages in achieving laser sources with tunable lasing wavelengths. For example, in early 2004, Rico et al. reported a wavelength tunable operation in a disordered Yb:NaGd(WO4)2 laser[1]. In 2009, Yu et al. reported a dual-wavelength operation in a disordered Nd:Ca3Nb1.5G3.5O12 (Nd:CNGG) laser[2]. Nd:La3Ga5SiO14, one of the oxyorthosilicate materials, has been demonstrated to tunably lase at about 900 nm[3]. Another disordered oxyorthosilicate material, Nd:LuYSiO5 crystal, was also reported to have many lasing possibilities at various emission lines[4]. Disordered laser material has another very important advantage, namely generating a femtosecond ultrashort pulse laser. For instance, in 2009, Xie et al. demonstrated a 900 fs laser using a Nd:Ca3Li0.275Nb1.775Ga2.95O12 (Nd:CLNGG) disordered crystal[5]. In 2014, Qin et al. reported a mode-locked disordered Nd,Y:CaF2 laser with a pulse time duration down to 103 fs[6]. In 2016, Ma et al. achieved a mode-locked Nd:Ca3La2(BO3)4 disordered laser with a pulse width as short as 79 fs[7].