快速扫频、低阈值电流、连续波外腔量子级联激光器

Fast Swept-Wavelength, Low Threshold-Current, Continuous-Wave External Cavity Quantum Cascade Laser.

作者信息

Jia Xuefeng, Wang Lijun, Jia Zhiwei, Zhuo Ning, Zhang Jinchuan, Zhai Shenqiang, Liu Junqi, Liu Shuman, Liu Fengqi, Wang Zhanguo

机构信息

Key Laboratory of Semiconductor Materials Science & Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China.

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.

出版信息

Nanoscale Res Lett. 2018 Oct 26;13(1):341. doi: 10.1186/s11671-018-2765-1.

DOI:10.1186/s11671-018-2765-1

PMID:30367319

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6203702/

Abstract

We present a low threshold-current and fast wavelength-tuning external cavity quantum cascade laser (EC-QCL) using a scanning galvanometer in the Littman-Metcalf cavity geometry. The EC-QCL could repeatedly swept at 100 Hz over its full tuning range of about 290 nm (2105 cm to 2240 cm), providing a scan rate of 59.3 μm s. The continuous-wave (CW) threshold current of the EC-QCL was as low as 250 mA and the maximum output power was 20.8 mW at 400 mA for a 3-mm-long QCL gain chip. With a sawtooth wave modulation, a scan resolution of < 0.2 cm can be achieved within the tuning range. The low power-consumption and fast swept-wavelength EC-QCL will be beneficial to many applications.

摘要

我们展示了一种低阈值电流且快速波长调谐的外腔量子级联激光器（EC-QCL），它在Littman-Metcalf腔结构中使用扫描振镜。该EC-QCL能够在约290纳米（2105厘米至2240厘米）的全调谐范围内以100赫兹的频率重复扫描，扫描速率为59.3微米/秒。对于一个3毫米长的QCL增益芯片，该EC-QCL的连续波（CW）阈值电流低至250毫安，在400毫安时的最大输出功率为20.8毫瓦。通过锯齿波调制，在调谐范围内可实现小于0.2厘米的扫描分辨率。这种低功耗且快速扫频波长的EC-QCL将对许多应用有益。