The laser diode (diode laser) is a small semiconductor diode that emits radiation physically. This diode is directly pumped with an electrical current which creates lasing conditions at the junction of the diode. So they can change electrical energy directly into light. Laser diodes contain SH (single heterojunction), DH (double heterojunction), and QW (quantum well) laser diodes. These diodes manufacture laser modules manufactured by companies like Osram, Mitsubishi, Nichia, Sony, etc. So the … [Read more...]