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

页码：1864 / 1867

页数：4

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