title: Sum-frequency-generation system for differential absorption lidar measurement of atmospheric nitrogen dioxide.
abstract: A sum-frequency-generation system for differential absorption lidar measurement of atmospheric nitrogen dioxide in the lower troposphere was developed. The system uses a combination of a pair of KD*P crystals and a tunable dye laser with LDS 765 dye pumped by the second harmonic of a Nd:YAG laser to generate lambdaon and lambdaoff alternatively. Compared with the conventional system that uses Coumarin 445 dye pumped by the third harmonic, the output energy and long-term stability were improved. By use of this system, atmospheric NO2 concentrations of approximately 10-50 ppb were measured, with an instrumental error of approximately 7 ppb.
authors.affiliation: Central Research Institute of Electric Power Industry, Tokyo, Japan. nayuki@criepi.denken.or.jp
authors.forename: Takuya
authors.initials: T
authors.lastname: Nayuki
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Fukuchi
authors.forename: Nianwen
authors.initials: N
authors.lastname: Cao
authors.forename: Hideto
authors.initials: H
authors.lastname: Mori
authors.forename: Takashi
authors.initials: T
authors.lastname: Fujii
authors.forename: Koshichi
authors.initials: K
authors.lastname: Nemoto
authors.forename: Nobuo
authors.initials: N
authors.lastname: Takeuchi