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Updated: Jan 7, 2026

In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation

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Published on: May 27, 2013

Tunable 300 W single-frequency 2 μm fiber amplifier.

Reagan R D Weeks, Ryan A Lane, Brian M Anderson

|December 24, 2025

Summary

This summary is machine-generated.

This study introduces a tunable, all-fiber thulium-doped fiber amplifier. It delivers high-power, single-frequency output across a broad wavelength range, demonstrating efficient performance up to 2085 nm.

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

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Last Updated: Jan 7, 2026

In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation

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

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Published on: July 12, 2017

Area of Science:

Laser Physics
Optical Engineering

Background:

High-power fiber amplifiers are crucial for various scientific and industrial applications.
Thulium (Tm)-doped fiber amplifiers offer potential for operation in the 2-micron wavelength region.

Purpose of the Study:

To develop and characterize a high-power, tunable, all-fiber thulium-based fiber amplifier.
To extend the operational bandwidth of Tm-doped amplifiers to longer wavelengths.

Main Methods:

Utilized a multi-stage amplifier design incorporating both Tm-doped and Tm/Ho-doped gain fibers.
Employed longer sections of Tm fiber to enhance bandwidth extension.
Characterized output power, spectral properties, amplified spontaneous emission (ASE) content, and beam quality (M²).

Main Results:

Achieved tunable output from 1992-2065 nm with 300-350 W of single-frequency (<100 kHz linewidth) power.
Delivered over 180 W up to 2085 nm with less than 10% ASE without spectral filters.
Observed efficiencies of approximately 55% across the operational bandwidth.
Reported an average M² value of 1.39 at high power, with estimates of pedestal light and higher-order mode content.

Conclusions:

The developed all-fiber Tm-based amplifier design successfully extends high-power operation to longer wavelengths (>2050 nm).
The amplifier demonstrates efficient and tunable output, suitable for applications requiring high-power, narrow-linewidth sources in the 2-micron range.
ASE management becomes critical beyond 2085 nm, indicating a limit for this specific configuration.