Dekker P, Ams M, Calmano T, Gross S, Kränkel C, Huber G, Withford M J
Opt Express. 2015 Jul 27;23(15):20195-202. doi: 10.1364/OE.23.020195.
Laser written waveguides in crystalline materials can be used to make highly efficient, high gain lasers. The bi-directional emission from such lasers however is typically broadband with poor spectral control. Hybridizing a tapered, mode matched laser written Bragg grating with a broadband Yb:YAG crystalline waveguide laser, we demonstrate single longitudinal mode output from one end of the device. Careful control of the grating characteristics led to laser thresholds below 90 mW, slope efficiencies greater than 42% and output powers greater than 20 mW.
晶体材料中的激光写入波导可用于制造高效、高增益激光器。然而，此类激光器的双向发射通常是宽带的，光谱控制较差。我们将锥形、模式匹配的激光写入布拉格光栅与宽带镱：钇铝石榴石晶体波导激光器相结合，实现了从该器件一端的单纵模输出。对光栅特性的精确控制使得激光阈值低于90毫瓦，斜率效率大于42%，输出功率大于20毫瓦。
