材料科学
分析化学(期刊)
算法
计算机科学
化学
色谱法
作者
Ji Chen,Yuan Jin,Liang Gao,John L. Reno,Sushil Kumar
出处
期刊:Optics Letters
[The Optical Society]
日期:2021-04-08
卷期号:46 (8): 1864-1864
被引量:8
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 m W are overlapped in the far field at frequencies ranging from 3.31 − 3.54 T H z . Collinear propagation with a maximum angular deviation of 0.3 ∘ 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.
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