Raman lasing in multimode diode-pumped graded-index fiber with fs-inscribed 3D random FBG array

A. G. Kuznetsov; A. A. Wolf; Zh. Munkueva; S. A. Babin

doi:10.1117/12.2650993

14 March 2023 Raman lasing in multimode diode-pumped graded-index fiber with fs-inscribed 3D random FBG array

A. G. Kuznetsov, A. A. Wolf, Zh. Munkueva, S. A. Babin

Proceedings Volume 12405, Nonlinear Frequency Generation and Conversion: Materials and Devices XXII; 124050L (2023) https://doi.org/10.1117/12.2650993
Event: SPIE LASE, 2023, San Francisco, California, United States

Conference Poster

Abstract

We report on the achieving and investigating random Raman lasing based on femtosecond (fs) pulse written randomly spaced scattering points (Rayleigh reflector) and random array of fiber Bragg gratings (FBGs) in graded-index (GRIN) fiber directly pumped by multimode laser, with much better output characteristics in the last case. The fabricated 1D-3D FBG arrays are used as a complex output coupling mirror together with input highly-reflective FBG fabricated by a phase mask technology. The 1-km GRIN fiber (100/140um) line was pumped by 940-nm laser diodes with a total power of up to 180 W and beam quality M²~34. Above threshold pump power of ~100W, random lasing of the 1^st-order Stokes beam was obtained with output power exceeding 25 W at maximum pumping. The beam quality parameter M² varies with FBG distribution in the fiber cross-section and its best value amounts to ~2, while the linewidth narrows to 0.1-0.2 nm.

Citation Download Citation

A. G. Kuznetsov, A. A. Wolf, Zh. Munkueva, and S. A. Babin "Raman lasing in multimode diode-pumped graded-index fiber with fs-inscribed 3D random FBG array", Proc. SPIE 12405, Nonlinear Frequency Generation and Conversion: Materials and Devices XXII, 124050L (14 March 2023); https://doi.org/10.1117/12.2650993

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