Holmium laser is a new type of laser generated by pulsed solid-state laser device. It uses yttrium aluminum garnet (YAG) as the activation medium, and is doped with sensitizing ion Cr, energy-transmitting ion thulium (Tm) and activating ion Ho (Cr:Tm:Ho:YAG). Can be used in urology, otolaryngology, dermatology, gynecology and other departments. Laser surgery is non-invasive or minimally invasive, and the treatment of patients is very painful.