Widely Tunable 2.1 μm III-V-Silicon Hybrid Integrated Laser Based on a Single Microring Resonator

With the increasing demand for the detection of environmental and industrial gases, chip-scale laser sources operating in the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$2-2.5 \mu \mathrm{m}$</tex> wavelength range are attracting significant attention. [1]. Due to the complexity of gas components and discrete absorption lines, widely tunable laser sources are essential [2]. Over the past decade, considerable efforts have been made to miniaturize optical sensing and communication systems through integrated photonics technology [3]. Silicon photonic integrated circuits (SiPICs) offer high integration, density, and low cost due to silicon's high refractive index and complementary metal oxide semiconductor (CMOS) compatibility [4]. Therefore, the development of SiPIC-based semiconductor lasers is crucial for the field of gas sensing.