INTRACAVITY DIODE-LASER FOR ATMOSPHERIC FIELD-MEASUREMENTS

In situ detection of the absorption of atmospheric trace gases in the near infrared is feasible by using a compact intracavity diode laser s pectrometer. Provided that an effective absorber length of more than 1 km is achieved, the measurement of atmospheric peroxy radicals such a s HO2 with a detection limit of 2.4 x 10(7) molecules per cm(3) (1 ppt ) is possible. During our prototype development, stable trace gases su ch as H2O and CO2 will be measured. This paper describes the design an d development of our instrument, and first experimental results.