We demonstrated an electrically pumped InP-based microcavity laser operating in continuous-wave mode. The active region is designed with antimony surfactants to enhance the gain at 2 μm, and a selective electrical isolation scheme is used to secure continuous-wave operation for the microcavity laser at room temperature. The lasers were fabricated as a notched elliptical resonator, resulting in a highly unidirectional far-field profile with an in-plane beam divergence of less than 2°. Single-mode emission was obtained over the entire dynamic range, and the laser frequencies were tuned linearly with the pumping current. Overall, these directional lasers pave the way for portable and highly integrated on-chip sensing applications.

中红外量子级联激光器在红外对抗、痕量气体检测、自由空间光通信等领域具有广阔的应用前景，采用MOCVD生长量子级联激光器的方法具有生产效率高、可做再生长、便于多组分生长等优点。报道了可室温连续波工作的中红外量子级联激光器，波长4.6 μm，采用MOCVD生长应变补偿的InGaAs/InAlAs材料。实验探究了不同掺杂对芯片性能的影响，通过优化掺杂浓度提升了器件性能。腔长3 mm，脊宽13 μm的芯片在288 K的温度下，脉冲模式下最大峰值功率达到722 mW，电光转换效率和阈值电流密度分别为6.3%和1.04 kA/cm²，在连续模式下功率输出达到364 mW。文中成功实现了用MOCVD生长中红外量子级联激光器，为中红外波段的激光应用提供了技术支撑。

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.