A mains electricity (AC-powered) device assembly in which input energy is used to excite a diode to emit a high-power therapeutic laser beam designed to perform dermatological procedures such as body hair removal (e.g., armpit, leg/arm, back, chest, bikini line, and face) and/or skin resurfacing (e.g., treatment of benign lesions, wrinkle reduction). It is intended to be used by a trained professional to emit pulsed light of a specific wavelength (e.g., around 808 nm or 1060 nm), delivered by a dedicated handpiece. It typically includes a control unit with dedicated software and user interface, delivery handpiece, and footswitch.