Laser device

The utility model relates to the technical field of laser equipment, in particular to a laser. The laser comprises a shell, a semiconductor cooler and a mounting plate, the semiconductor cooler and a hot surface are connected with the shell, the cold surface is provided with a mounting area and two deformation areas, the two deformation areas are located on the two opposite sides of the cold surface respectively, and the mounting area is located between the two deformation areas; the mounting plate is mounted on the cold surface mounting area; and the optical group is mounted on one side, back to the cold surface, of the mounting plate. According to the laser provided by the embodiment of the utility model, the mounting plate is arranged between the optical assembly and the semiconductor cooler, and the optical assembly is lifted by the mounting plate, so that a deformation area on the cold surface of the semiconductor cooler is separated from the optical assembly, and direct contact between the optical assem