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Medientyp:
E-Artikel
Titel:
SBS mitigation by sinusoidal phase modulation of a 1572 nm all-fiber amplifier for lidar CO2 sensing
Beteiligte:
Pichon, Pierre;
Le Gouët, Julien;
Lombard, Laurent
Erschienen:
Optica Publishing Group, 2024
Erschienen in:
Applied Optics, 63 (2024) 7, Seite 1753
Sprache:
Englisch
DOI:
10.1364/ao.514650
ISSN:
1559-128X;
2155-3165
Entstehung:
Anmerkungen:
Beschreibung:
Lidar CO2 sensing can be performed by 1572 nm pulsed laser sources. This work presents the development of a fiber amplifier at this wavelength emitting 1 µs FWHM Gaussian pulses at a repetition rate of 7.5 kHz. We obtain the mitigation of stimulated Brillouin scattering (SBS) by shaping the seed laser spectrum into a frequency comb with sinusoidal phase modulation. This frequency comb is compatible with a coherent dual-comb spectroscopy (DCS) method for a targeted lidar CO2 sensing application. The effect of the harmonics spacing and relative intensity on the SBS threshold is studied. Laser pulses are amplified up to 182 µJ (182 W peak power) from a single-mode erbium (Er) and ytterbium (Yb) co-doped fiber. Those results hold promise for seeding large mode area Er-Yb co-doped fiber power amplifiers.