Multi-wavelength high energy gas-filled fiber Raman laser spanning from 1.53 um to 2.4 um

TL;DR

This paper demonstrates a high-energy, multi-wavelength Raman laser covering 1.53 to 2.4 micrometers using cascaded SRS in a hydrogen-filled fiber, with tunable energy distribution via pressure control.

Contribution

It introduces a novel multi-wavelength Raman laser with high pulse energy and tunable output across a broad infrared range using a hydrogen-filled anti-resonant fiber.

Findings

Achieved laser wavelengths at 1683 nm, 1868 nm, 2100 nm, and 2400 nm.

Pulse energies up to 18.25 μJ at 1683 nm.

Energy distribution can be tuned by adjusting H2 pressure.

Abstract

In this work, we present a high pulse energy multi-wavelength Raman laser spanning from 1.53 um up to 2.4 um by employing the cascaded rotational stimulated Raman scattering (SRS) effect in a 5-m hydrogen (H2) -filled nested anti-resonant fiber (NARF), pumped by a linearly polarized Er/Yb fiber laser with a peak power of ~13 kW and pulse duration of ~7 ns in the C-band. The developed Raman laser has distinct lines at 1683 nm, 1868 nm, 2100 nm, and 2400 nm, with pulse energies as high as 18.25 uJ, 14.4 uJ, 14.1 uJ, and 8.2 uJ, respectively. We demonstrate how the energy in the Raman lines can be controlled by tuning the H2 pressure from 1 bar to 20 bar