Sum-frequency-generation system for differential absorption lidar measurement of atmospheric nitrogen dioxide.
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.
Nayuki
Takuya
T
Central Research Institute of Electric Power Industry, Tokyo, Japan. nayuki@criepi.denken.or.jp
Fukuchi
Tetsuo
T
Cao
Nianwen
N
Mori
Hideto
H
Fujii
Takashi
T
Nemoto
Koshichi
K
Takeuchi
Nobuo
N