Laser

The utility model provides a laser. A laser source, a collimator, an isolator and an optical lens assembly are sequentially arranged along the output main light path. Laser output by the laser sourcesequentially penetrates through the collimator, the isolator and the optical lens assembly. The laser further comprises a double-color sheet, an indication light source and an indication light lens. The double-color sheet is arranged on the output main light path and is positioned between the isolator and the optical lens assembly; laser is transmitted and input into the optical lens assembly fromthe double-color piece, the indication light source, the indication light lens and the double-color piece are sequentially arranged along an indication light path, indication light output by the indication light source passes through the indication light lens and then is input into the double-color piece, and the indication light is reflected and input into the optical lens assembly from the double-color piece. According