Laser diode - Wikipedia

Laser - Wikipedia

Fabry–Pérot interferometer - Wikipedia

Quantum well infrared photodetector - Wikipedia

Laser diode - Wikipedia

File:Simple laser diode.svg - Wikipedia

Fabry–Pérot interferometer - Wikipedia

Why is direct band gap semiconductor material used in a

Laser construction - Wikipedia

Line Laser Diode - 5mW 650nm Red

Energy level diagram of erbium doped fiber laser (Courtesy Wikipedia).