Gallium arsenide
Videos
Gallium arsenide (GaAs) is a III-V direct band gap semiconductor with a zinc blende crystal structure.
GaAs wafer of (100) orientation
Triple-junction GaAs cells covering MidSTAR-1
Laser diode
Videos
A laser diode is a semiconductor device similar to a light-emitting diode in which a diode pumped directly with electrical current can create lasing conditions at the diode's junction.
A packaged laser diode shown with a penny for scale*488 nm: InGaN green-blue laser; became widely available in mid-2018.
The laser diode chip removed and placed on the eye of a needle for scale
A laser diode with the case cut away. The laser diode chip is the small black chip at the front; a photodiode at the back is used to control output power.
SEM (scanning electron microscope) image of a commercial laser diode with its case and window cut away. The anode connection on the right has been accidentally broken by the case cut process.