Abstract

We report 3.1-3.2 μm mid-infrared emission from acetylene-filled low loss antiresonant hollow-core fiber pumped with an amplified, modulated, narrowband, tunable 1.5 μm diode laser. The maximum power conversion efficiency of ~30%, with respect to the absorbed pump power, is obtained with a 10.5 m length of fiber at 0.7 mbar. The maximum efficiency with respect to the total incident pump power (~20%) and the minimum pump laser energy required (<50 nJ) are both improved compared to similar work reported previously using an optical parametric oscillator as a pump source. This paper provides an effective route to obtain compact mid-infrared fiber lasers.

Highlights

  • Fiber lasers have wide potential applications, and are increasingly replacing traditional solid state and gas lasers in many applications [1] due to their compactness, high efficiencies, excellent beam qualities and convenient heat management

  • We report 3.1-3.2 μm mid-infrared emission from acetylenefilled low loss antiresonant hollow-core fiber pumped with an amplified, modulated, narrowband, tunable 1.5 μm diode laser

  • The maximum efficiency with respect to the total incident pump power (~20%) and the minimum pump laser energy required (

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Summary

Introduction

Fiber lasers have wide potential applications, and are increasingly replacing traditional solid state and gas lasers in many applications [1] due to their compactness, high efficiencies, excellent beam qualities and convenient heat management. The spectral linewidth of light generated in glass fibers will broaden at high powers. Mid-IR fiber lasers are usually generated in erbium-doped or holmium-doped glass fibers. Gas lasers have been demonstrated to be an effective method to generate mid-IR emission [8,9,10,11,12,13,14]. By properly designing the transmission bands of HC-PCF, selecting active gases and pump sources, fiber gas lasers can potentially provide a wide range of emission wavelengths from the UV to the IR. The first mid-IR fiber gas laser was demonstrated in acetylene-filled Kagome structured hollow core fiber in 2011 [20], but the measured slope efficiency was only ~1%

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