Wavelength-Stable Metal Grating Distributed Feedback Quantum Cascade Laser Emitting at λ ~ 7.2 μm

IF 3.7 3区工程技术 Q2 CHEMISTRY, ANALYTICAL

Chemosensors Pub Date : 2023-12-26 DOI:10.3390/chemosensors12010002

Kedi Ma, Zizhuo Liu, Feng-Min Cheng, Pengchang Yang, Hongxiao Li, Shan Niu, Gaohui Ge, Hao Xu, N. Zhuo, Hui Su, Jinchuan Zhang

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引用次数: 0

Abstract

In this research, we demonstrate a wavelength-stable continuous wave (CW) distributed feedback (DFB) quantum cascade laser (QCL) emitting at 7.2 μm using a surface metal grating approach without epitaxial regrowth. The deep metal grating provides an appropriate DFB coupling coefficient and enhanced thermal extraction, resulting in improved lasing performance and the realization of impressive wavelength stability. Quantitatively, the temperature tuning coefficient of the single-mode emission is only 0.54 nm/°C from 20 °C to 70 °C, and the current tuning coefficient of the single-mode emission is 3.2 nm/A from 1.0 A to 1.6 A. A DFB-QCL with a 2 mm cavity length exhibits a low threshold current of 0.6 A and a power of 1.1 W with a slope efficiency of 1 W/A in the CW mode at 300 K. A single-mode operation with a side mode suppression ratio of 33 dB and a single-lobed far-field without beam steering is obtained in the working temperature range of 20–70 °C The improved wavelength stability using a deep surface metal grating approach promises simplified fabrication, which is meaningful for the commercial applications of QCLs.

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波长稳定的金属光栅分布反馈量子级联激光器，在 λ ~ 7.2 μm 波长范围内发光

在这项研究中，我们展示了一种波长稳定的连续波（CW）分布式反馈（DFB）量子级联激光器（QCL），其发射波长为 7.2 μm，采用的是表面金属光栅方法，无需外延再生长。深金属光栅提供了适当的 DFB 耦合系数和更强的热提取，从而改善了激光性能并实现了令人印象深刻的波长稳定性。从数量上看，单模发射的温度调节系数从 20 °C 到 70 °C 仅为 0.54 nm/°C，单模发射的电流调节系数从 1.0 A 到 1.6 A 为 3.2 nm/A。在 20-70 °C 的工作温度范围内，可实现单模运行，侧模抑制比为 33 dB，并且在无光束转向的情况下可实现单叶远场。采用深表面金属光栅方法提高了波长稳定性，从而简化了制造过程，这对 QCL 的商业应用意义重大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemosensors Chemistry-Analytical Chemistry

CiteScore

5.00

自引率

9.50%

发文量

450

审稿时长

11 weeks

期刊介绍： Chemosensors (ISSN 2227-9040; CODEN: CHEMO9) is an international, scientific, open access journal on the science and technology of chemical sensors published quarterly online by MDPI.The journal is indexed in Scopus, SCIE (Web of Science), CAPlus / SciFinder, Inspec, Engineering Village and other databases.