High efficiency quantum cascade laser frequency comb

被引：32

作者：

Lu, Quanyong ^{[1
]}

Wu, Donghai ^{[1
]}

Slivken, Steven ^{[1
]}

Razeghi, Manijeh ^{[1
]}

机构：

[1] Northwestern Univ, Ctr Quantum Devices, Dept Elect Engn & Comp Sci, Evanston, IL 60208 USA

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

基金：

美国国家科学基金会;

关键词：

MU-M; SPECTROSCOPY; GENERATION;

D O I：

10.1038/srep43806

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

An efficient mid-infrared frequency comb source is of great interest to high speed, high resolution spectroscopy and metrology. Here we demonstrate a mid-IR quantum cascade laser frequency comb with a high power output and narrow beatnote linewidth at room temperature. The active region was designed with a strong-coupling between the injector and the upper lasing level for high internal quantum efficiency and a broadband gain. The group velocity dispersion was engineered for efficient, broadband mode-locking via four wave mixing. The comb device exhibits a narrow intermode beatnote linewidth of 50.5 Hz and a maximum wall-plug efficiency of 6.5% covering a spectral coverage of 110 cm(-1) at lambda - 8 mu m . The efficiency is improved by a factor of 6 compared with previous demonstrations. The high power efficiency and narrow beatnote linewidth will greatly expand the applications of quantum cascade laser frequency combs including high-precision remote sensing and spectroscopy.

引用

页数：7

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