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996 nm high-power single-longitudinal-modetapered gain-coupled distributed feedbacklaser diodes

Applied Optics
  • Yuxin Lei, Yongyi Chen, Feng Gao, Dezheng Ma, peng jia, Hao Wu, Chunkao Ruan, Lei Liang, Chao Chen, jun zhang, Qin li, Yongqiang Ning, and Lijun Wang
  • received 12/27/2018; accepted 04/08/2019; posted 04/08/2019; Doc. ID 356135
  • Abstract: High-power single-longitudinal-mode regrowth-free tapered gain-coupleddistributed feedback laser diode based on periodic current injection is achieved at 996 nm. Itenhances the output power without beam quality degrading. A continuous-wave output powerof over 1.12 W is achieved at 3 A. The maximum output power in single-longitudinal-modeoperation is up to 0.56 W at 1.4 A. The power conversion efficiency is over 24 % and theslope efficiency is 0.58 W/A. The side mode suppression ratio is over 38 dB, the 3 dBspectral linewidth is less than 2.4 pm. The lateral far field divergence angle is only 14.98 °,the beam quality factor M2 is 1.64, achieving a near-diffraction-limit emission. Our devicehas great potential in commercial applications and experimental study of high-powernear-diffraction-limit laser diode for its low-cost fabrication technique and narrowbandsingle-longitudinal-mode emission at high power.
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