300-watt single-frequency Yb3+-doped phosphate fiber amplifier

Fiber Lasers XXIII: Technology and Systems 2026

View at publisher
Authors: Xiushan Zhu, John Kim, Maranda M. Allen, Jie Zong, Maohe Li, Arturo Chavez-Pirson
DOI: 10.1117/12.3081444
Cited by: 1

Abstract

We report a 320-W single-frequency, diffraction-limited laser output (M2 < 1.15) achieved using a 20-cm large-mode-area (LMA) phosphate fiber amplifier doped with 8 wt.% Yb3+. The gain fiber, featuring a 40-μm core diameter and a numerical aperture (NA) of ⁓0.02, exhibits a record-low propagation loss of 0.32 dB/m. The amplifier delivered a >40% electrical-to-optical efficiency, an optical signal-to-noise ratio exceeding 50 dB, and a polarization extinction ratio greater than 17 dB.

Fields of Study & Subjects

Photonic Crystal and Fiber Optics Glass properties and applications Advanced Fiber Optic Sensors

Publication details

Journal / source
Fiber Lasers XXIII: Technology and Systems
Publisher
SPIE
Pages
4–4
Publication date
4 March 2026