Mechanisms of beam clean up at Raman conversion of multimode radiation in graded-index fibers

Alexey G. Kuznetsov; Sergey I. Kablukov; Evgeniy V. Podivilov; Sergey A. Babin

doi:10.1117/12.2577685

5 March 2021 Mechanisms of beam clean up at Raman conversion of multimode radiation in graded-index fibers

Alexey G. Kuznetsov, Sergey I. Kablukov, Evgeniy V. Podivilov, Sergey A. Babin

Proceedings Volume 11670, Nonlinear Frequency Generation and Conversion: Materials and Devices XX; 116700K (2021) https://doi.org/10.1117/12.2577685
Event: SPIE LASE, 2021, Online Only

Abstract

As shown recently, highly multimode (M2~30) radiation of laser diodes may be converted in graded-index fibers into high-quality (M2≤2) Raman beam at Stokes-shifted wavelength. Here we experimentally study output beam profiles for the transmitted pump and generated Stokes beams and develop an analytical balance model enabling theoretical beam profiles both near the Raman threshold and well above the threshold where significant depletion of the pump beam occurs due to the Raman conversion. Comparison of the theory and experiment allows for the identification of main mechanisms of the Raman beam clean up in this system, including linear and nonlinear effects.

Conference Presentation

Citation Download Citation

Alexey G. Kuznetsov, Sergey I. Kablukov, Evgeniy V. Podivilov, and Sergey A. Babin "Mechanisms of beam clean up at Raman conversion of multimode radiation in graded-index fibers", Proc. SPIE 11670, Nonlinear Frequency Generation and Conversion: Materials and Devices XX, 116700K (5 March 2021); https://doi.org/10.1117/12.2577685

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