Group 1 - The company, Jiuziyang (久之洋), focuses on laser ranging and laser irradiation fields, developing a series of products covering applications such as laser ranging, laser irradiation, laser warning, laser communication, and laser countermeasures [1] - The company has not yet conducted research on narrow linewidth lasers, despite the advanced position of the Huazhong Optical Technology Research Institute in this field [1]