10-W pulsed operation of substrate emitting photonic-crystal quantum cascade laser with very small divergence

Dan-Yang Yao; Jin-Chuan Zhang; Olivier Cathabard; Shen-Qiang Zhai; Ying-Hui Liu; Zhi-Wei Jia; Feng-Qi Liu; Zhan-Guo Wang

doi:10.1186/s11671-015-0877-4

10-W pulsed operation of substrate emitting photonic-crystal quantum cascade laser with very small divergence

Nanoscale Res Lett. 2015 Apr 14:10:177. doi: 10.1186/s11671-015-0877-4. eCollection 2015.

Authors

Dan-Yang Yao¹, Jin-Chuan Zhang¹, Olivier Cathabard¹, Shen-Qiang Zhai¹, Ying-Hui Liu¹, Zhi-Wei Jia¹, Feng-Qi Liu¹, Zhan-Guo Wang¹

Affiliation

¹ Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083 China.

Abstract

High-power broad area substrate emitting photonic-crystal distributed feedback (DFB) quantum cascade lasers (QCLs) emitting around 4.73 μm is reported. Two-dimensional centered rectangular photonic-crystal (CRPC) grating is introduced to enhance optical coherence in large area device. Main lobe far-field radiation pattern with a very small divergence angle of about 0.65° × 0.31° is obtained. A record peak output power for vertical emitting QCLs exceeding 10 W is obtained with high reflectivity (HR) coating. Robust single longitudinal mode emission with a side mode suppression ratio (SMSR) of 30 dB is continuously tunable by the heat sink temperature up to 65°C.

Keywords: 42.55.Px; 42.55.Tv; 42.60.Da; 42.60.Jf.