物理
占空比
光学
激光阈值
激光器
环形激光器
激光线宽
振荡(细胞信号)
方波
半导体激光器理论
原子物理学
量子力学
化学
电压
生物化学
作者
Song-Sui Li,Xiaozhou Li,Jun-Ping Zhuang,G. Mezősi,Marc Sorel,Sze-Chun Chan
出处
期刊:Optics Letters
[The Optical Society]
日期:2016-02-08
卷期号:41 (4): 812-812
被引量:17
摘要
Square-wave (SW) switching of the lasing direction in a semiconductor ring laser (SRL) is investigated using counter-directional mutual feedback. The SRL is electrically biased to a regime that supports lasing in either counter-clockwise (CCW) or clockwise (CW) direction. The CCW and CW modes are then counter-directionally coupled by optical feedback, where the CCW-to-CW and CW-to-CCW feedback are delayed by τ1 and τ2, respectively. The mutual feedback invokes SW oscillations of the CCW and CW emission intensities with a period of T≈τ1+τ2. When τ1=τ2, symmetric SWs with a duty cycle of 50% are obtained, where the switching time and electrical linewidth of the SWs can be reduced to, respectively, 1.4 ns and 1.1 kHz by strengthening the feedback. When τ1≠τ2, asymmetric SWs are obtained with a tunable duty cycle of τ1/(τ1+τ2). High-order symmetric SWs with a period of T=(τ1+τ2)/n can also be observed for some integer n. Symmetric SWs of order n=13 with a period of T=10.3 ns are observed experimentally.
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