Dr. Huilong Gao is a doctoral researcher in electrical and computer engineering specializing in III–V semiconductor optoelectronic devices, with a primary focus on mid-infrared quantum cascade lasers. His research integrates active-region design, optical and electrical modeling, and advanced device simulation using k·p theory and multiphysics tools. He has strong expertise in cleanroom fabrication, including regrowth-compatible processing, deep dry etching, and precision metallization for high-performance laser structures. His work combines device design with comprehensive electrical, optical, and cryogenic characterization to enhance efficiency, power, and reliability. He has contributed to the development of record-high wall-plug-efficiency QCLs and advanced buried heterostructure and DFB laser platforms. His research contributions are recognized through peer-reviewed publications in leading photonics and applied physics journals. His scholarly impact includes 60 citations with an h-index of 5 and an i10-index of 3.