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

Author Affiliations +

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.

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(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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