Pulsed generation of multimode diode-pumped graded-index fiber Raman laser

Alexey G. Kuznetsov; Ilya N. Nemov; Alexey A. Wolf; Sergey I. Kablukov; Sergey A. Babin

doi:10.1117/12.2537769

19 November 2019 Pulsed generation of multimode diode-pumped graded-index fiber Raman laser

Alexey G. Kuznetsov, Ilya N. Nemov, Alexey A. Wolf, Sergey I. Kablukov, Sergey A. Babin

Proceedings Volume 11181, High-Power Lasers and Applications X; 111810K (2019) https://doi.org/10.1117/12.2537769
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

We report on the first demonstration of pulsed regime of Raman laser based on a multimode graded-index fiber directly pumped by a CW multimode laser diode. Proof-of-principle experiments have been performed with a 3.7-km multimode graded-index fiber with 62.5-μm core pumped by 976-nm high-power laser diode and cavity formed by bulk mirror and fiber Bragg grating with intra-cavity acousto-optic modulator providing Q-switching or mode locking. At 27.2-kHz repetition rate corresponding to the laser cavity round-trip frequency (i.e. in mode-locking regime), stable nanosecond pulses with peak power of ~300 W have been observed both at the 1st (1018 nm) and 2nd (1064 nm) Stokes orders. At that, the beam quality of generated pulses is greatly improved as compared to that for the pump diode (M²>20) reaching M²=2 for the 2nd-order Stokes wave.

Citation Download Citation

Alexey G. Kuznetsov, Ilya N. Nemov, Alexey A. Wolf, Sergey I. Kablukov, and Sergey A. Babin "Pulsed generation of multimode diode-pumped graded-index fiber Raman laser", Proc. SPIE 11181, High-Power Lasers and Applications X, 111810K (19 November 2019); https://doi.org/10.1117/12.2537769

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KEYWORDS

Fiber lasers

Multimode fibers

Raman spectroscopy

Graded index fibers

Pulsed laser operation

Semiconductor lasers

Mode locking

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