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20 October 2015 Atmospheric CO2 remote sensing system based on high brightness semiconductor lasers and single photon counting detection
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Abstract
We propose an integrated path differential absorption lidar system based on all-semiconductor laser sources and single photon counting detection for column-averaged measurements of atmospheric CO2. The Random Modulated Continuous Wave (RM-CW) approach has been selected as the best suited to semiconductor lasers. In a RM-CW lidar, a pseudo random sequence is sent to the atmosphere and the received signal reflected from the target is correlated with the original sequence in order to retrieve the path length. The transmitter design is based on two monolithic Master Oscillator Power Amplifiers (MOPAs), providing the on-line and off-line wavelengths close to the selected absorption line around 1.57 µm. Each MOPA consists of a frequency stabilized distributed feedback master oscillator, a bent modulator section, and a tapered amplifier. This design allows the emitters to deliver high power and high quality laser beams with good spectral properties. An output power above 400 mW with a SMSR higher than 45 dB and modulation capability have been demonstrated. On the side of the receiver, our theoretical and experimental results indicate that the major noise contribution comes from the ambient light and detector noise. For this reason narrow band optical filters are required in the envisioned space-borne applications. In this contribution, we present the latest progresses regarding the design, modeling and characterization of the transmitter, the receiver, the frequency stabilization unit and the complete system.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Antonio Pérez-Serrano, Maria Fernanda Vilera, Ignacio Esquivias, Mickael Faugeron, Michel Krakowski, Frédéric van Dijk, Gerd Kochem, Martin Traub, Pawel Adamiec, Juan Barbero, Xiao Ai, John G. Rarity, Mathieu Quatrevalet, and Gerhard Ehret "Atmospheric CO2 remote sensing system based on high brightness semiconductor lasers and single photon counting detection", Proc. SPIE 9645, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing XI, 964503 (20 October 2015); https://doi.org/10.1117/12.2194345
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