Quasi-continuous wavelength tuning of single-mode interband cascade lasers based on V-coupled cavity
Quasi-continuous wavelength tuning of single-mode interband cascade lasers based on V-coupled cavity
复制标题
基于V耦合腔的单模带间级联激光器准连续波长调谐
DOI：
10.1117/12.2575270
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
He, Jian-Jun
中科院分区：
文献类型：
--
作者：
Jingli, Gong;Yang, Hanting;Yang, Rui Q.;He, Jian-Jun
中红外半导体激光器在气体传感、环境监测、医疗诊断等领域有着广泛的应用。V型耦合腔激光器（VCCL）具有无光栅、结构紧凑、波长控制简单等优点，已成功应用于通信波段，实现了宽调谐范围的单模工作。本文将V型耦合腔的概念引入到带间级联激光器中，研制了单片集成中红外宽调谐单模激光器。此外，我们还在实验上提出了一种简单通用的双电极同步控制波长调谐算法，并首次在基于V型耦合腔结构的中红外带间级联激光器中实现了单模波长的准连续调谐。在调谐过程中，短腔注入电流保持不变，长腔电流的阶梯式增加相当于实现了由短腔决定的沟道间距为1. 1 nm的离散调谐。在固定长腔电流的情况下，随着耦合器电极注入电流的增加，耦合器电流引起的热光效应会使两个FP腔的折射率一起发生变化，从而实现激光波长的微调。在110 ~ 120 K的温度范围内，实现了2.8244 ~ 2.8776 μm的53.2nm的调谐范围。
Mid-infrared semiconductor lasers have a wide range of applications in gas sensing, environmental monitoring, medical diagnosis and other fields. The V-coupled cavity laser (VCCL) approach has been successfully applied in the communication band to achieve single-mode operation with a wide tuning range because of its advantages of no grating, compact structure and simple wavelength control. In this paper, the concept of V-coupled cavity is introduced to the interband cascaded lasers, and a monolithically integrated mid-infrared widely tunable single-mode laser is developed. In addition, we experimentally demonstrated a simple and general algorithm for wavelength tuning controlled by two electrodes synchronously, and realized quasi-continuous tuning of single-mode wavelength in mid-infrared interband cascade laser based on the V-coupled cavity configuration for the first time. In the tuning process, the injection current of the short cavity remains unchanged, and the stepped increase of the long cavity current is equivalent to the realization of discrete tuning with the channel spacing of 1.1 nm determined by the short cavity. With the increase of the injection current of the coupler electrode while fixing the long cavity current, the thermo-optic effect caused by the coupler current will cause the refractive index of the two FP cavities to change together, thus realizing the fine tuning of the laser wavelength. A total tuning range of 53.2 nm has been achieved, from 2.8244 μm to 2.8776 μm, with the temperature adjusted from 110K to 120K.