he holmium laser uses yttrium aluminum garnet (YAG) as the activation medium, doped with sensitizing ions chromium (Cr), energy-transmitting ions thulium (Tm), and activating ion holmium (Ho) laser crystals (Cr:Tm:Ho:YAG) A new type of laser produced by a pulsed solid-state laser device. It can be used in urology, ENT, dermatology, gynecology and other departments. The laser surgery is a non-invasive or minimally invasive surgery, and the patient's treatment pain is very small.