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9 October 2009 A novel 2 μm, frequency conversion based, laser transmitter for CO2 DIAL
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We report on a novel 2 μm laser transmitter for CO2 DIAL, based on a nanosecond parametric master oscillator-power amplifier architecture. The master oscillator is an entangled-cavity, doubly resonant, optical parametric oscillator, based on a type-II periodically poled Lithium Niobate nonlinear crystal. This device provides single-longitudinal-mode radiation, with a high frequency stability and high beam quality, with no need of an additional seeding source. The 2.05 μm signal emission is amplified by multi-stage parametric amplifiers to generate more than 10 mJ. After amplification, both the spectral purity and beam quality are maintained: we demonstrate single-longitudinal-mode emission with a frequency stability better than 3 MHz rms, within a nearly diffraction limited beam, with a M2 quality factor close to 1.5. The unique performances of this parametric architecture make this device a relevant transmitter for CO2 differential-absorption LIDAR. Such approach could be readily duplicated for the detection of other greenhouse gases.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Raybaut, A. Godard, A. K. Mohamed, M. Lefebvre, F. Marnas, P. Flamant, A. Bohman, P. Geiser, and P. Kaspersen "A novel 2 μm, frequency conversion based, laser transmitter for CO2 DIAL", Proc. SPIE 7479, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing V, 74790G (9 October 2009);

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