Wavelength beam-combining of terahertz quantum-cascade laser arrays

被引：6
作者：
Chen, Ji [1 ]
Jin, Yuan [1 ]
Gao, Liang [1 ]
Reno, John L. [2 ]
Kumar, Sushil [1 ]
机构：
[1] Lehigh Univ, Dept Elect & Comp Engn, Bethlehem, PA 18015 USA
[2] Sandia Natl Labs, Ctr Integrated Nanotechnol, MS 1303, Albuquerque, NM 87185 USA
来源：
OPTICS LETTERS | 2021年 / 46卷 / 08期
基金：
美国国家科学基金会;
关键词：
SPECTROSCOPY; POWER;
D O I：
10.1364/OL.420398
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Wavelength beam-combining of four terahertz (THz) distributed-feedback quantum-cascade lasers (QCLs) is demonstrated using low-cost THz components that include a lens carved out of a plastic ball and a mechanically fabricated blazed grating. Single-lobed beams from predominantly single-mode QCLs radiating peak power in the range of 50-170 mW are overlapped in the far field. at frequencies ranging from 3.31-3.54 THz. Collinear propagation with a maximum angular deviation of 0.3 degrees is realized for the four beams. The total power efficiency for the focused and beam-combined radiation is as high as 25%. This result could pave the way for future commercialization of beam-combined monolithic THz QCL arrays for multi-spectral THz sensing and spectroscopy at standoff distances. (C) 2021 Optical Society of America
引用
收藏
页码：1864 / 1867
页数：4
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