Mid-infrared laser absorption-based sensors for trace gas detection using difference-frequency generation

eal-time, compact, laser absorption-based sensors for trace gas detection have been developed. Difference-frequency generation in a periodically poled lithium niobate (PPLN) crystal pumped by two compact lasers, a near-infrared diode laser and a monolithic ring Nd:YAG laser, is used as a mid-infrared laser source. Detection of carbon monoxide (CO) and formaldehyde...