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Proceedings Paper

Single-frequency Raman fiber amplifier emitting 11 µj 150 W peak-power at 1645 nm for remote methane sensing applications
Author(s): Philippe Benoit; Nicolas Cézard; Anne Durécu; Arnaud Mussot; Alexandre Kudlinski; Guillaume Canat
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Paper Abstract

Remote methane concentration measurement using a Differential Absorption Lidar system can be performed using a single-frequency pulsed laser source at 1645.55 nm. This wavelength cannot be efficiently amplified in conventional Erbium Doped Fiber Amplifier as the gain band stops around 1620 nm. We report on a single-frequency polarization-maintaining pulsed amplifier at 1645 nm relying on stimulated Raman scattering (SRS) in highly nonlinear silica fibers (HNLF). Considering that SRS converts pump photons to photons frequency-downshifted by 13.2 THz with a gain bandwidth of 2 THz, a 1545 nm pump can efficiently amplify a 1645 nm seed laser. The drawback of using a HNLF is that the single-frequency signal will also experience stimulated Brillouin scattering (SBS) through its amplification. This issue has been partially solved by designing a two-stage amplification setup minimizing SBS. In the first stage, a 20 m piece of HNLF has been used so that the effective length of the amplified signal stays under SBS threshold. In the second stage, we used a 2.5 m piece of HNLF and high pump peak-power to significantly reduce the effective length, allowing more amplification. We report on generation of single-frequency 11 μJ energy pulses at 1645 nm corresponding to 150 W peak-power and 80 ns pulse duration at 20 kHz pulse repetition frequency.

Paper Details

Date Published: 11 March 2016
PDF: 6 pages
Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 97281E (11 March 2016); doi: 10.1117/12.2209646
Show Author Affiliations
Philippe Benoit, ONERA (France)
Nicolas Cézard, ONERA (France)
Anne Durécu, ONERA (France)
Arnaud Mussot, Univ. Lille (France)
Alexandre Kudlinski, Univ. Lille (France)
Guillaume Canat, ONERA (France)

Published in SPIE Proceedings Vol. 9728:
Fiber Lasers XIII: Technology, Systems, and Applications
John Ballato, Editor(s)

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