Pico Laser. Hair Removal Areas: Nose, ear, lip, beard, chest, armpit, back, arm, leg, and any unwanted hair outside the bikini line. Diode Laser Working Areas. Based on the principles of selective photothermodynamics, by rationally adjusting wavelength, energy, and pulse width, light energy penetrates the skin’s surface directly to the root of the hair follicles, damaging the follicle tissue and slowing or halting its growth.