Mode Control of Quasi-PT Symmetry in Laterally Multi-Mode Double Ridge Semiconductor Laser

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2020,（4）
• 页码范围: 67-70
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/37/4/044207

摘要

In traditional semiconductor lasers,it is usual to obtain single lateral mode operation by narrowing the ridge of waveguide,which is sensitive to fabrication inaccuracies.To overcome this shortcoming,a quasi-PT (parity-time)symmetric double ridge semiconductor laser is proposed to reach single lateral mode operation for an intrinsic multi-mode stripe laser.The coupled mode theory is used to analyze the non-Hermitian modulation of the gain (or loss) of the PT symmetric double ridge laser to obtain the coupling coefficient between the two ridge waveguides.Finally,the mode field distributions of the quasi-PT symmetric double ridge laser are simulated before and after the spontaneous PT symmetry breaking,which keep the laser operating in single lateral mode.