Semiconductor lasers are a type of laser that use a semiconductor material as the gain medium. These lasers are commonly used in various applications, such as telecommunications, optical storage, barcode scanners, and medical devices. Semiconductor lasers are typically smaller, more efficient, and less expensive than other types of lasers, making them widely used in modern technology. Researchers in this field study the design, fabrication, and performance of semiconductor lasers, as well as exploring new materials and technologies to improve their performance and expand their applications.