Wavelength beam-combining of terahertz quantum-cascade laser arrays
Posted on 07.04.2021 - 14:26
Wavelength beam-combining of four terahertz distributed-feedback (DFB) quantum-cascade lasers (QCLs) is demonstrated using low-cost terahertz 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◦ 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 terahertz sensing and spectroscopy at standoff distances.
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Chen, Ji; Jin, Yuan; gao, liang; Reno, John; Kumar, Sushil (2021): Wavelength beam-combining of terahertz quantum-cascade laser arrays. The Optical Society. Collection. https://doi.org/10.6084/m9.figshare.c.5341931.v2
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