Tushar Sanjay Karnik, Laurent Diehl, Qingyang Du, Jia Xu Brian Sia, Christian Pflügl, Daryoosh Vakhshoori, Juejun Hu
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引用次数: 0
Abstract
Quantum cascade lasers (QCLs) are essential for a wide range of mid-infrared (mid-IR) applications. Achieving wavelength beam combining (WBC) of QCLs on a chip scale is highly desirable for power scaling and/or broadband emission multi-wavelength output while maintaining a single output beam. We propose a straightforward architecture that monolithically integrates five distributed feedback (DFB) QCLs with an arrayed waveguide grating (AWG), using III-V semiconductor waveguides. The AWG channel wavelengths are carefully designed to align with the corresponding DFB emissions. An amplifier is also incorporated at the output to boost the total power. After the deposition of anti-reflection coatings on the output facet, the best-performing laser element achieved a peak power of 3 W under pulsed operation, with at least 1.75 W from the other channels. These results mark a significant step toward the realization of on-chip high-power WBC QCLs.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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