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Related Experiment Video

Updated: Jun 10, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

A higher-order-mode erbium-doped-fiber amplifier.

J W Nicholson¹, J M Fini, A M DeSantolo

¹OFS Laboratories, 19 Schoolhouse Road, Suite 105, Somerset, NJ 08873, USA. jwn@ofsoptics.com

|August 20, 2010

Summary

Researchers developed the first erbium-doped fiber amplifier using a single, large-mode area, higher-order mode. This advancement achieved 5.8 W output power with over 20 dB gain in a compact amplifier.

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Published on: November 22, 2019

Area of Science:

Optics and Photonics
Laser Physics
Fiber Optics

Background:

Higher-order modes (HOMs) in fiber amplifiers offer larger effective mode areas, enabling higher power operation.
Previous HOM fiber amplifiers have faced challenges with mode purity and stability.
Erbium-doped fiber amplifiers (EDFAs) are crucial for optical communications but are typically limited to fundamental mode operation.

Purpose of the Study:

To demonstrate the first erbium-doped fiber amplifier operating in a single, large-mode area, higher-order mode (HOM).
To achieve high-power output with significant gain in a compact fiber amplifier.
To investigate the feasibility of using HOMs for high-power fiber laser and amplifier applications.

Main Methods:

Utilized a high-power, fundamental-mode Raman fiber laser at 1480 nm as the pump source.
Employed a UV-written, long-period grating to convert both pump and signal light to the LP(0,10) mode.
Fabricated a 2.68 m long erbium-doped fiber amplifier designed for HOM operation.

Main Results:

Achieved a maximum output power of 5.8 W at 1564 nm.
Obtained more than 20 dB of signal gain.
The effective mode area of the LP(0,10) mode was 2700 µm² at 1550 nm.
The output mode profile remained undistorted even at the highest output power.

Conclusions:

Successfully demonstrated the first single, large-mode area, higher-order mode erbium-doped fiber amplifier.
The developed amplifier shows potential for high-power applications by maintaining mode quality.
This work paves the way for future high-power fiber laser and amplifier systems utilizing HOMs.