Frequency doubling of graded-index fiber Raman lasers with multimode diode pumping

Aleksey G. Kuznetsov; Ekaterina A. Evmenova; Ekaterina I. Dontsova; Sergey I. Kablukov; Sergey A. Babin

doi:10.1117/12.2545836

2 March 2020 Frequency doubling of graded-index fiber Raman lasers with multimode diode pumping

Aleksey G. Kuznetsov, Ekaterina A. Evmenova, Ekaterina I. Dontsova, Sergey I. Kablukov, Sergey A. Babin

Proceedings Volume 11264, Nonlinear Frequency Generation and Conversion: Materials and Devices XIX; 112641J (2020) https://doi.org/10.1117/12.2545836
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

Graded-index fibers with special in-fiber Bragg gratings are shown to convert efficiently highly multimode (M² ~30) laser diode pump radiation in all-fiber Raman laser configuration into a high-quality Stokes beam at 954 and 976 nm (M² =1.6-2.6 in different configurations). The beam quality improvement is provided by well-known Raman beam cleanup effect defined by Raman gain profile, and additional impact of transverse mode-selective properties of cavity feedback provided by special femtosecond-pulse inscribed fiber Bragg gratings and/or random Rayleigh backscattering distributed along the fiber. Here we study frequency doubling of the diode-pumped Raman fiber laser in a simple singlepass scheme with 5-mm PPLN crystal demonstrating efficient second harmonics generation at 477 and 488 nm with high beam quality after elimination of interfering effects.

Conference Presentation

Citation Download Citation

Aleksey G. Kuznetsov, Ekaterina A. Evmenova, Ekaterina I. Dontsova, Sergey I. Kablukov, and Sergey A. Babin "Frequency doubling of graded-index fiber Raman lasers with multimode diode pumping", Proc. SPIE 11264, Nonlinear Frequency Generation and Conversion: Materials and Devices XIX, 112641J (2 March 2020); https://doi.org/10.1117/12.2545836

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