Raman amplification of optical beam carrying orbital angular momentum in a multimode step-index fiber | Zendy

Shankar Pidishety | Zendy; Sheng Zhu | Zendy; Yutong Feng | Zendy; Balaji Srinivasan | Zendy; Johan Nilsson | Zendy

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Raman amplification of optical beam carrying orbital angular momentum in a multimode step-index fiber

Author(s) -

Shankar Pidishety,

Sheng Zhu,

Yutong Feng,

Balaji Srinivasan,

Johan Nilsson

Publication year - 2019

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.44.001658

Subject(s) - optics , materials science , multi mode optical fiber , raman spectroscopy , raman scattering , polarization maintaining optical fiber , optical amplifier , double clad fiber , optical fiber , fiber optic sensor , physics , laser

We experimentally demonstrate 15 dB of Raman amplification of 1115 nm pulses in an orbital angular momentum mode (OAMM) with charge l=+2, S=+1 in 5 m of step-index 25 μm-diameter-core fiber. The total output reaches 4.5 kW of peak power and 68.5 μJ of energy in ∼15 ns pulses at 4 kHz repetition rate. An Yb-doped fiber source pumps the Raman amplifier at 1060 nm with 60 ns pulses. Using a spatial light modulator for modal decomposition, we measure 83% purity for the amplified target OAMM of selected polarization. To the best of our knowledge, this is the first time high energy, peak power, gain, and purity are achieved in a fiber Raman amplifier for a single OAMM.

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