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12 March 2019 High-order transversal mode suppression by facet loss in 970nm broad area laser
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Abstract
In this research, the transversal mode of 970 nm broad area laser diode based on a large optical cavity is studied. The vertical far-field patterns were measured to be dependent on the cavity caused facet loss. High-orders modes achieve lasing with higher facet loss while they can be completely suppressed by a low facet loss. The suppression of high-order modes was attributed to be an increase in the discrimination of differential quantum efficiency between high-order modes and the fundamental mode, which matches well with simulation. When the discrimination exceeds probable fluctuations, the high-order modes will be completely suppressed and lasing of single fundamental mode will achieve. According to our experiment results, the optimal resonance cavity length is about 6 mm in order to realize fundamental mode and simultaneously a high slope efficiency. As a consequence, high efficiency 970 nm broad area laser with slope efficiency over 1.07 W/A and full wavelength half maximum (FWHM) less than 2 nm@1A is demonstrated.
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Junjie Kang, Weichuan Du, Yi Li, Kun Zhou, Yao Hu, Liang Zhang, Songxin Gao, Deyong Wu, Hao Tan, Zhao Wang, and Chun Tang "High-order transversal mode suppression by facet loss in 970nm broad area laser", Proc. SPIE 11023, Fifth Symposium on Novel Optoelectronic Detection Technology and Application, 110234I (12 March 2019); https://doi.org/10.1117/12.2521937
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