Random lasing in multimode diode-pumped graded-index fiber based on artificial Rayleigh scattering in fs-inscribed random structure

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

doi:10.1117/12.2644088

28 December 2022 Random lasing in multimode diode-pumped graded-index fiber based on artificial Rayleigh scattering in fs-inscribed random structure

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

Author Affiliations +

Proceedings Volume 12310, Advanced Lasers, High-Power Lasers, and Applications XIII; 1231018 (2022) https://doi.org/10.1117/12.2644088
Event: SPIE/COS Photonics Asia, 2022, Online Only

Conference Poster

Abstract

We study an opportunity to obtain low-threshold random Raman lasing in multimode diode-pumped graded-index (GRIN) fiber with enhanced backscattering in artificial fs-inscribed random structure. Proof-of-principle experiments have been performed with a 1-km multimode GRIN fiber of 100-µm core directly pumped by three fiber-combined high-power 940- nm LDs. The laser has half-open all-fiber cavity consisting of highly-reflective FBG which is UV-inscribed in GRIN fiber near the LD input and artificial random reflector near its output end. Different types of random structures were formed by the point-by-point femtosecond-pulse technique in the near-axis area of GRIN fiber core (different pitch, length and transverse profile). Comparison of their lasing properties in the multimode diode-pumped GRIN fiber has been performed. The lowest threshold of ~140 W and the highest output power of 6.2 W (at ~180 W pumping) with the beam quality M²~3.3 is achieved for 2D structure. It is shown that the quality is improved to M²~2.4 for 1D structure at the expense of slight reduction in output power (5.5 W).

Citation Download Citation

A. G. Kuznetsov, A. A. Wolf, Zh. Munkueva, and S. A. Babin "Random lasing in multimode diode-pumped graded-index fiber based on artificial Rayleigh scattering in fs-inscribed random structure", Proc. SPIE 12310, Advanced Lasers, High-Power Lasers, and Applications XIII, 1231018 (28 December 2022); https://doi.org/10.1117/12.2644088

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