20 October 2015 Long range wind lidars based on novel high spectral brilliance all-fibered sources
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Abstract
New Lidar applications related to aircraft safety in the area of an airport include mapping wind velocity and monitoring turbulences within a radius longer than 8km in a short acquisition time (360° map in 1 minute). During landing and takeoff, a minimal distance separation between aircrafts is set by referring to wake turbulence categories. However, it was shown that wake vortices can dissipate quicker because of atmospheric turbulence (characterized by eddy dissipation rate - EDR) or can be transported out of the way on oncoming traffic by cross-winds. Long range scanning Lidars provide radial wind data that can be used to calculate EDR.

To reach long range within a short acquisition time, coherent wind Lidars require high power (~kW), narrow linewidth (few MHz) pulsed laser sources with nearly TF limited pulse duration (~1μs). Eyesafe, all-fiber laser sources based on MOPFA (master oscillator, power fiber amplifier) architecture offer many advantages over bulk sources such as low sensitivity to vibrations, efficiency and versatility. However, narrow linewidth pulsed fiber lasers and amplifiers are usually limited by nonlinear effects such as stimulated Brillouin scattering (SBS) to 300W with commercial fibers. We investigated various solutions to push this limit further. For example, a source based on a new fiber composition yielded a peak power of 1120W for 650ns pulse duration with excellent beam quality. Based on these innovative solutions we built a Lidar with a record range of 16km in 0.1s averaging time.

In this proceeding, we present some recent results obtained with our wind Lidars based on these high power sources with record ranges. EDR measurements using the developed algorithm based on structure function calculation are presented, as well as its validation with simulations and measurements campaign results.
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L. Lombard, L. Lombard, A. Dolfi-Bouteyre, A. Dolfi-Bouteyre, C. Besson, C. Besson, B. Augère, B. Augère, P. Bourdon, P. Bourdon, A. Durécu, A. Durécu, D. Goular, D. Goular, J. Le Gouët, J. Le Gouët, C. Planchat, C. Planchat, W. Renard, W. Renard, M. Valla, M. Valla, G. Canat, G. Canat, } "Long range wind lidars based on novel high spectral brilliance all-fibered sources", Proc. SPIE 9645, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing XI, 96450B (20 October 2015); doi: 10.1117/12.2197350; https://doi.org/10.1117/12.2197350
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