Abstract In order to further improve the Nd3+:(LuxGd1-x)3Ga5O12 (Nd:LGGG) crystal performance in high power laser field, a long Nd:LGGG crystal with dimensions of Φ 23 × 112 mm3 has been grown successfully by the Czochralski (Cz) method for laser rod fabrication. Compared with the normal size LGGG crystals (like 30–50 mm in length), we overcame several difficulties in the growth of longer ones, including crystal cracking by a large longitudinal temperature gradient, spiral growth by a small radial temperature gradient, and growth instability and even constitutional super cooling by Ga2O3 volatilizing continuously. The doping concentrations of Nd3+ and Lu3+ in the as-grown crystal and the crystal optical quality have been measured. The performance of diode-side-pumped Nd:LGGG rod laser has been preliminarily tested for the first time, simply by replacing the Nd:YAG crystal rod inside a commercial laser module. Under an incident pump power of 160 W, the maximum continuous wave output power of 38 W has been obtained, corresponding to an optical-optical conversion efficiency of 23.8% and a slope efficiency of 40.8%, respectively.

中文翻译：

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用于高功率激光应用的更长 Nd:LGGG 晶体的开发

摘要 为了进一步提高 Nd3+:(LuxGd1-x)3Ga5O12 (Nd:LGGG) 晶体在高功率激光场中的性能，Czochralski 成功地生长了尺寸为 Φ 23 × 112 mm3 的长 Nd:LGGG 晶体（ Cz) 激光棒制造方法。与正常尺寸的 LGGG 晶体（如 30-50 毫米长）相比，我们克服了较长晶体生长的几个困难，包括大纵向温度梯度导致的晶体开裂、小径向温度梯度导致的螺旋生长和生长不稳定甚至通过连续挥发的 Ga2O3 构成超冷。测量了生长晶体中Nd3+和Lu3+的掺杂浓度和晶体光学质量。二极管侧泵浦Nd:LGGG棒状激光器的性能首次经过初步测试，只需更换商用激光模块内的 Nd:YAG 晶体棒即可。在160 W的入射泵浦功率下，获得了38 W的最大连续波输出功率，分别对应23.8%的光光转换效率和40.8%的斜率效率。