Mr. Vincent Boulanger Profile

Vincent Boulanger

Undergraduate at Univ Laval

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Proceedings Article | 21 February 2020 Presentation + Paper

Inner-cladding pump reflector based on chirped volume Bragg gratings

Lauris Talbot, Louis-Charles Michaud, Vincent Boulanger, Pascal Paradis, Martin Bernier

Proceedings Volume 11261, 112610R (2020) https://doi.org/10.1117/12.2546707

KEYWORDS: Reflectivity, Fiber lasers, Reflectors, Cladding, Femtosecond phenomena, Capillaries, Fiber Bragg gratings, Silica, Laser resonators, Structured optical fibers

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The cladding-pumping scheme has made the power scalability of rare-earth-doped fiber lasers up to record levels possible by distributing the pump absorption along much longer fiber lengths. However, in addition to increasing the fiber cost and the cavity losses, a longer cavity length leads to enhanced detrimental nonlinear effects such as stimulated Raman scattering. As a way to reduce the required length of such lasers, we propose here an all-fiber laser architecture that makes use of a femtosecond-written chirped inner-cladding Bragg grating (ICBG) as a residual pump reflector. We report a 73% reflectivity of the pump power propagating in the highly multimode 125 μm-diameter inner cladding of the fiber made out of pure silica. This component was inscribed by using 400 nm femtosecond pulses and the phase-mask technique. Such a reflectivity was reached by optimizing the chirp of the grating and by inserting the fiber inside a hollow capillary with an outside diameter of 1 mm during the inscription. The latter reduces greatly the impact of the fiber’s curvature on the refraction of the writing beam. A larger writing area and consequently a stronger reflectivity could therefore be reached. The presence of this component at the output of a 21 m long erbium-doped silica fiber laser operating at 1.6 μm increased its slope efficiency from 20.5 to 25.1 % with respect to the injected pump power and increased its output from 22.8 to 29 W at 115 W of pump power.

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