Research in precision optics, optical fabrication, large-aperture optics and laser processing at the Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences.
A team led by researcher Meng Bo at the Changchun Institute of Optics, Fine Mechanics and Physics published a paper in Laser & Photonics Reviews presenting a mid-infrared quantum cascade laser with a goblet-shaped waveguide structure. The active region is formed by selective wet etching, eliminating the semi-insulating InP lateral regrowth process. A 1 mm × 3 μm device achieved a continuous-wave threshold power of about 1 W at 293 K, an output power above 27 mW, and a room-temperature pulsed wall-plug efficiency of 3.9%. A 2 μm-wide device maintained stable single-mode lasing across the entire current range, with a side-mode suppression ratio of about 20 dB.
Why we recommend it: The goblet-shaped waveguide eliminates the semi-insulating InP regrowth step through selective wet etching. The paper reports room-temperature continuous-wave threshold power and wall-plug efficiency, which can be compared with buried-heterostructure devices.
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Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP) · Research ProgressOptics industryPicksAI score5959
A team led by researcher Meng Bo at the Changchun Institute of Optics, Fine Mechanics and Physics published a paper in Light: Science & Applications proposing a multistate-to-continuum (MTC) active-region design based on diagonal transitions, and used MOCVD to grow a mid-infrared quantum cascade laser with a single active region and an ultrabroad gain spectrum.
Why we recommend it: The diagonal-transition design from multiple states to continuum states allows several transition channels to contribute gain simultaneously. The paper reports lasing spectral widths of 1.2 µm at room temperature and 1.93 µm at 80 K, directly relevant to applications such as mid-infrared frequency combs.