The development of a continuous wave (CW), thermoelectrically cooled (TEC), Quantum Cascade laser (QCL) based spectroscopic trace gas sensor for selective and ultra-sensitive nitric oxide (NO) concentration measurements is reported. The sensor is based on scanned wavelength Direct Absorption Spectroscopic (DSA) technique using a 10 cm short gas cell. The QCL has been designed to target the interference free NO R (6.5) absorption line at 1900.08 cm−1. A minimum detectable concentration of 5 parts per million by volume (ppmv) with 1 sec response time was achieved. The demonstrated detection sensitivity allows applications including environmental monitoring, industrial process control and medical diagnostics.

© 2014 Optical Society of America

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