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High power single-sided Bragg reflection waveguide lasers with dual-lobed far field |
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| Authors: | L J Wang Y Yang Y G Zeng L J Wang C Z Tong X N Shan H X Zhao R Wang S F Yoon |
| Institution: | 1. Key laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China 2. Graduate School of the Chinese Academy of Sciences, Beijing, 100049, China 3. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Republic of Singapore |
| Abstract: | We report on 980-nm InGaAs/GaAs lasers with dual-lobed far field based on a single-sided Bragg reflection waveguide (BRW). The high slope efficiency ～0.92 W/A and a continuous wave (CW) output power >1.5 W (3.2 W pulsed) have been obtained. The threshold current density is as low as 253 A/cm2 for a 1.5-mm-long device and the transparency current density is only 140 A/cm2. The further analysis shows the intrinsic reason for the single-lobed or the dual-lobed far-field distribution is determined by the mode shape in the cavity, not the single-sided or dual-sided BRW structure. The condition to achieve a narrow single-lobed far-field distribution is discussed. |
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