All-fiber high-peak power chirped pulse amplifier based on a triple-cladding fiber for pulse stretching and a highly-Yb-doped pedestal fiber for pulse amplification

Konstantin K. Bobkov; Denis Lipatov; Mikhail Salganskiy; Dmitry Khydiakov; Alexey Guryanov; Mikhail Likhachev

doi:10.1117/12.2624502

25 May 2022 All-fiber high-peak power chirped pulse amplifier based on a triple-cladding fiber for pulse stretching and a highly-Yb-doped pedestal fiber for pulse amplification

Konstantin K. Bobkov, Denis Lipatov, Mikhail Salganskiy, Dmitry Khydiakov, Alexey Guryanov, Mikhail Likhachev

Author Affiliations +

Proceedings Volume 12142, Fiber Lasers and Glass Photonics: Materials through Applications III; 121421I (2022) https://doi.org/10.1117/12.2624502
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Conference Poster

Abstract

We demonstrate a highly-Yb-doped fiber with pedestal and triple-cladding stretching fiber for utilizing in chirped pulses amplification systems with high ratio of stretching/compression and low level of stimulated Raman scattering. The stretching triple-cladding fiber consisting of high-index Ge-doped core, low-index F-doped depression concentric layer and high-index Ge-doped concentric layer. By varying the fiber structure parameters (refractive indexes and geometrical size) we were able to tailor its dispersion parameter and its slope values in order to match these with a grating-pair compressor ones to obtain better pulse compression quality (shortest possible duration and pedestal-free structure). Realized fiber has dispersion parameter of -140 ps/nm/km at 1026 nm and slope of 12 um^-1. The highly-Yb-doped fiber for the final amplification stage of the CPA has aluminophosphorosilicate glass core with a germanium-doped pedestal around it; core/pedestal diameters were 14/50 um, outer cladding has square shape with edge size of 130 um. Despite of high Yb ions content (cladding absorption of 40 dB/m at 976 nm) the core NA was only 0.09 due to the creation of the pedestal. We utilized a 23 cm piece of the fiber to amplify 22ps chirped pulses with 1.432 MHz repetition rate up to 10.2W of average power, when the first stokes of Raman starts to evolve, corresponding to 320 kW of peak power. The pump-to-signal conversion efficiency was 64%. M2 factor was 1.15/1.12. Experiments on amplification of the 500 ps chirped pulses and its compression will be presented at the conference.

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Konstantin K. Bobkov, Denis Lipatov, Mikhail Salganskiy, Dmitry Khydiakov, Alexey Guryanov, and Mikhail Likhachev "All-fiber high-peak power chirped pulse amplifier based on a triple-cladding fiber for pulse stretching and a highly-Yb-doped pedestal fiber for pulse amplification", Proc. SPIE 12142, Fiber Lasers and Glass Photonics: Materials through Applications III, 121421I (25 May 2022); https://doi.org/10.1117/12.2624502

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