20 February 2018 Influence of longitudinal mode lock by external grating on filamentation and catastrophic optical mirror damage (COMD) of 970 nm broad area single emitters
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Abstract
For many applications, laser diodes with very narrow and stable emission wavelength are needed. The realization of mode selection by an external cavity system with a grating is widely used. The influence of longitudinal mode selection by external grating on the filamentation and catastrophic optical mirror damage (COMD) of 970 nm broad area single emitters is studied in this paper. The emitters worked at three configurations: free running, with 10% mirror feedback (mirror lasers), and 10% grating feedback (grating lasers). The grating lasers showed very short lifetime caused by COMD, while the free-running lasers and mirror lasers show no power degradation. The COMD was confirmed by optical microscope showing cracking and melting of the optical antireflective (AR) coatings. By observing the near-field pattern of the three lasers, the COMD of the grating lasers was attributed to the pronounced filamentation induced by the grating feedback. What’s more, the filamentations vary when the locked wavelength change which indicates that the carrier dynamics thus the refractive index profile is very sensitive to the locked lasing wavelength.
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Kun Zhou, Kun Zhou, Hao Tan, Hao Tan, Weichuan Du, Weichuan Du, Yi Li, Yi Li, Huicheng Meng, Huicheng Meng, Huaijin Ren, Huaijin Ren, Jue Peng, Jue Peng, Songxin Gao, Songxin Gao, Yi Ma, Yi Ma, Ruijun Li, Ruijun Li, Chun Tang, Chun Tang, Jianping Liu, Jianping Liu, Deyao Li, Deyao Li, Hui Yang, Hui Yang, } "Influence of longitudinal mode lock by external grating on filamentation and catastrophic optical mirror damage (COMD) of 970 nm broad area single emitters", Proc. SPIE 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 106974B (20 February 2018); doi: 10.1117/12.2307289; https://doi.org/10.1117/12.2307289
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