Lead–salt lasers

Abstract
Lead–salt diode lasers have been commercially available for more than two decades and became essential for laser mid–infrared gas analysis with high sensitivity and selectivity. Their emission covers the wavelength range from below 3 μm to more than 20 μm. Continuous emission is observed to above 200 K, and pulsed emission to above 80°C. Their main advantage over other materials is a two orders of magnitude lower Auger recombination rate. Basic material properties, the present state–of–the–art lead–salt lasers and trends and possibilities are discussed.