title: 10-W pulsed operation of substrate emitting photonic-crystal quantum cascade laser with very small divergence.
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.
authors.affiliation: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083 China.
authors.forename: Dan-Yang
authors.initials: DY
authors.lastname: Yao
authors.affiliation: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083 China.
authors.forename: Jin-Chuan
authors.initials: JC
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083 China.
authors.forename: Olivier
authors.initials: O
authors.lastname: Cathabard
authors.affiliation: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083 China.
authors.forename: Shen-Qiang
authors.initials: SQ
authors.lastname: Zhai
authors.affiliation: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083 China.
authors.forename: Ying-Hui
authors.initials: YH
authors.lastname: Liu
authors.affiliation: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083 China.
authors.forename: Zhi-Wei
authors.initials: ZW
authors.lastname: Jia
authors.affiliation: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083 China.
authors.forename: Feng-Qi
authors.initials: FQ
authors.lastname: Liu
authors.affiliation: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing, 100083 China.
authors.forename: Zhan-Guo
authors.initials: ZG
authors.lastname: Wang
keywords: 42.55.Px; 42.55.Tv; 42.60.Da; 42.60.Jf