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3226956 
Journal Article 
Continuous-wave differential absorption lidar 
Mei, L; Brydegaard, M 
2015 
1 
Laser & Photonics Reviews
ISSN: 1863-8880 
9 
6 
629-636 
WOS:000368255200005 
This work proves the feasibility of a novel concept of differential absorption lidar based on the Scheimpflug principle. The range-resolved atmospheric backscattering signal of a laser beam is retrieved by employing a tilted linear sensor with a Newtonian telescope, satisfying the Scheimpflug condition. Infinite focus depth is achieved despite employing a large optical aperture. The concept is demonstrated by measuring the range-resolved atmospheric oxygen concentration with a tunable continuous-wave narrow-band laser diode emitting around 761 nm over a path of one kilometer during night time. Laser power requirements for daytime operation are also investigated and validated with single-band atmospheric aerosol measurements by employing a broad-band 3.2-W laser diode. The results presented in this work show the potential of employing the continuous-wave differential absorption lidar (CW-DIAL) technique for remote profiling of atmospheric gases in daytime if high-power



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narrow-band continuous-wave light sources were to be employed. 
Differential absorption lidar; atmospheric gas sensing; Scheimpflug principle; oxygen; laser diode