High performance FBG-based components for kilowatt fiber lasers power scaling

Brochu, Guillaume; Gouin, Samuel; Brown-Dussault, Evelyne; Huneault, Mathieu; Faucher, Dominic; Faucher, Mathieu; Trepanier, Francois

doi:10.1117/12.2548351

Cited by 2 publications

(2 citation statements)

References 37 publications

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“…A CTFBG could also be written directly through the coating of the active fiber to avoid the strip and recoat process potentially giving a higher mechanical strength 19 and allowing a higher pump power transmission 9 . This also offers the possibility to easily write as many ASE filters as required into the same piece of doped fiber.…”

Section: Ase Filter Inscribed Directly Into the Active Fibermentioning

confidence: 99%

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Efficient 1018nm high power fiber laser using intracavity tilted FBG ASE filters

Morasse,

Perron,

Faucher

et al. 2024

Fiber Lasers XXI: Technology and Systems

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We present an efficient way to remove unwanted amplified stimulated emission (ASE) in high-power fiber lasers and amplifiers using intracavity chirped tilted fiber Bragg grating (CTFBG) filters. The grating is written with tilted fringes so that the unwanted ASE is reflected into the fiber cladding where it is no longer amplified. Depending on the desired emission wavelength and active fiber, one or several filters are spliced within the active fiber to suppress ASE before it reaches a detrimental power. Numerical simulations clearly show that adding the filters allows amplification in configurations that would just be impossible due to the onset of ASE. The filter bandwidth and extinction, and the maximum allowed active fiber length between each filter are also computed depending on the core/cladding diameter ratio of the active fiber used and the targeted emission wavelength. As an example, a fiber laser at 1018 nm is assembled in a 20/400µm core/cladding diameter ytterbium fiber that is cladding pumped at 976 nm. Two CTFBGs with 20 dB attenuation from 1025 nm to 1070 nm are spliced within the 6-meter-long ytterbium fiber. 432 W of laser emission at 1018 nm is efficiently achieved at 77% slope efficiency with respect to the absorbed pump power. The extinction between the 1018 nm signal and the ASE is greater than 50 dB. Removing the ASE filters from the cavity clearly leads to only self-pulsation of the ASE between 1030 nm and 1050 nm, no generation of 1018 nm light was possible. The measured thermal slope of the filters shows scalability above the kW level. Demonstration at 1908 nm with a 25/400 core/cladding diameter thulium doped fiber is also done. Tests were done to inscribe the CTFBG directly in an ytterbium fiber for simpler implementation and avoid additional splicing.

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Section: Ase Filter Inscribed Directly Into the Active Fibermentioning

confidence: 99%

“…CTFBGs have been proven in the past to be very effective to suppress stimulated Raman scattering in multi-kilowatt fiber laser 9 . In this paper, we present the use of such gratings to remove ASE in high power integrated monolithic fiber lasers and amplifiers.…”

Section: Introductionmentioning

confidence: 99%

Efficient 1018nm high power fiber laser using intracavity tilted FBG ASE filters

Morasse,

Perron,

Faucher

et al. 2024

Fiber Lasers XXI: Technology and Systems

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Femtosecond Mamyshev oscillator at 920 nm

Boulanger,

Olivier,

Morasse

et al. 2024

Opt. Lett.

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A femtosecond all-PM-fiber Mamyshev oscillator (MO) at 920 nm is presented. It is based on a neodymium-doped fiber with a W-type index profile that effectively suppresses the emission around 1064 nm. The linear cavity is bounded by two near-zero dispersion fiber Bragg gratings with Gaussian reflectivity profiles. The laser is self-starting and generates up to 10-nJ pulses at a repetition rate of 41 MHz. The pulses can be compressed to 53 fs with a grating-pair compressor. To our knowledge, this is the first Mamyshev oscillator and also the highest energy femtosecond fiber oscillator demonstrated in this spectral region.

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High performance FBG-based components for kilowatt fiber lasers power scaling

Cited by 2 publications

References 37 publications

Efficient 1018nm high power fiber laser using intracavity tilted FBG ASE filters

Efficient 1018nm high power fiber laser using intracavity tilted FBG ASE filters

Femtosecond Mamyshev oscillator at 920 nm

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