Single-frequency erbium-doped fiber amplifier with high energy gain at low repetition rates

Venkatapuram S. Sudarshanam; Cang Jin; Jeffrey W. Nicholson

doi:10.1117/12.2688232

12 March 2024 Single-frequency erbium-doped fiber amplifier with high energy gain at low repetition rates

Venkatapuram S. Sudarshanam, Cang Jin, Jeffrey W. Nicholson

Proceedings Volume 12865, Fiber Lasers XXI: Technology and Systems; 1286507 (2024) https://doi.org/10.1117/12.2688232
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

We report pulse energy of 1.6 mJ at 1 kHz repetition rate from a single-frequency fiber amplifier with high energy gain of 19 dB at 1560 nm, using a 2.4 m long, Very-Large Mode Area (VLMA) Polarization-Maintaining (PM) erbium-doped fiber with 50 μm core diameter and absorption of 50 dB/m, core-pumped with a CW, 1480 nm Raman fiber laser. The in-pulse power fraction was 85%. The FWHM of the output pulses was 1.48 μs at 1 kHz repetition rate. At 150 Hz repetition rate, of interest in coherent wind LIDAR systems, we report 1 mJ, with energy gain of 17 dB, in-pulse power fraction of 72%, and FWHM of 1.24 μs. Stimulated Brillouin scattering limited the maximum energy reported here. The output of the fiber amplifier was diffraction limited, with mean beam quality factor, M², of 1.04. The polarization extinction ratio exceeded 20 dB.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Venkatapuram S. Sudarshanam, Cang Jin, and Jeffrey W. Nicholson "Single-frequency erbium-doped fiber amplifier with high energy gain at low repetition rates", Proc. SPIE 12865, Fiber Lasers XXI: Technology and Systems, 1286507 (12 March 2024); https://doi.org/10.1117/12.2688232

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