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Related Experiment Video

Updated: Jan 17, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

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425-W kilohertz-linewidth single-frequency Tm-fiber MOPA enabled by distributed cladding-pumping.

Chuanyong Ren, Yongxiang Hu, Yi Song

|September 23, 2025

Summary

This summary is machine-generated.

This study demonstrates a 425 W single-frequency thulium-doped fiber laser using distributed cladding-pumping. This high-power, narrow-linewidth laser achieves excellent beam quality and low noise, setting a new record for the 2 µm spectral region.

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Last Updated: Jan 17, 2026

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Area of Science:

* Laser Physics and Photonics
* Fiber Laser Technology
* Nonlinear Optics

Background:

* High-power, single-frequency fiber lasers are crucial for various applications, including spectroscopy and remote sensing.
* Thulium-doped fiber lasers operating in the 2 µm region offer unique wavelength advantages.
* Achieving high power while maintaining narrow linewidth and good beam quality remains a challenge.

Purpose of the Study:

* To develop and investigate a high-power, narrow-linewidth, single-frequency thulium-doped all-fiber master oscillator power amplifier (MOPA).
* To explore the dynamic behavior of stimulated Brillouin scattering (SBS) in a distributed cladding-pumping scheme (DCPS).
* To achieve power scaling of a single-frequency seed source to a record high output power level.

Main Methods:

* A ring-cavity configuration was used to create a single-frequency seed laser utilizing holmium-doped fiber as a filter.
* A distributed cladding-pumping scheme (DCPS) was employed for power amplification.
* Theoretical investigation of stimulated Brillouin scattering (SBS) dynamics was performed.

Main Results:

* A single-frequency seed laser operated at 1998.13 nm with a linewidth of ~8.5 kHz and OSNR > 65 dB.
* Power scaling to 425 W was achieved with a 9 kHz spectral bandwidth and 53% slope efficiency.
* Maintained OSNR > 59 dB, M² < 1.20, and excellent low relative intensity noise (RIN) properties.

Conclusions:

* The developed DCPS-enabled Tm-fiber MOPA achieved a record output power for monolithic single-frequency Tm-fiber lasers in the 2 µm region.
* The system demonstrates excellent beam quality and low noise characteristics suitable for demanding applications.
* This work advances the capabilities of high-power fiber lasers in the mid-infrared spectrum.