Semiconductor mid-infrared lasers working at high temperature application to gas analysis

Abstract

There is a need for low-cost and portable equipment. The exigency in terms of the sensitivity lies around the 1 ppm level. Tunable diode laser spectroscopy (TDLAS) appears to be the best candidate to fulfill these requirements. To be performed in good conditions TDLAS needs the laser to be operated in continuous mode. Unfortunately there is presently no semiconductor laser able to operate in cw mode beyond 2.7 /spl mu/m at room temperature. We try to overcome this problem.