1.5 μm dual-lateral-mode distributed Bragg reflector laser for terahertz excitation

• 作 者: 张莉萌 余力强 潘碧玮 陆丹 潘教青 赵玲娟
• 机 构: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of S
• 出 处: Chinese Optics Letters
• 发表日期: 2016年01期
• 关键词: reflector terahertz Bragg excitation waveguide spacing suppression tuning curren

A terahertz excitation source based on a dual-lateral-mode distributed Bragg reflector(DBR) laser working in the 1.5 μm range is experimentally demonstrated. By optimizing the width of the ridge waveguide, the fundamental and the first-order lateral modes are obtained from the laser. The mode spacing between the two modes is9.68 nm, corresponding to a beat signal of 1.21 THz. By tuning the bias currents of the phase and DBR sections,the wavelengths of the two modes can be tuned by 2 nm, with a small strength difference(<5 dB) and a large side-mode suppression ratio(SMSR > 45 dB).

A terahertz excitation source based on a dual-lateral-mode distributed Bragg reflector (DBR) laser working in the 1.5 μm range is experimentally demonstrated. By optimizing the width of the ridge waveguide, the fundamental and the first-order lateral modes are obtained from the mode. The mode spacing between the two modes is9.68 nm, corresponding to a beat signal of 1.21 THz. By tuning the bias currents of the phase and DBR sections, the wavelengths of the two modes can be tuned by 2 nm, with a small strength difference (<5 dB) and a large side-mode suppression ratio (SMSR> 45 dB).