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Updated: May 30, 2025

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

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

Published on: November 22, 2019

Generating 1.2 GHz, 38 fs stretched-pulse directly from a robust mode locked solid-state fiber laser.

Ya Wang, Ruoao Yang, Zhendong Chen

|January 29, 2025

Summary

We developed a novel compact Ytterbium-doped fiber laser operating at 1.2 GHz, achieving sub-40 femtosecond pulses. This innovative laser technology enables octave-spanning supercontinuum generation without external amplification.

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Last Updated: May 30, 2025

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

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

Published on: November 22, 2019

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

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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Area of Science:

Optics and Photonics
Laser Physics
Ultrafast Science

Background:

Mode-locked fiber lasers are crucial for generating ultrashort optical pulses.
Nonlinear polarization rotation (NPR) is a common technique for mode-locking lasers.
Compact and high-repetition-rate lasers are in demand for various applications.

Purpose of the Study:

To demonstrate the first 1.2 GHz nonlinear polarization rotation (NPR) Ytterbium-doped (Yb:fiber) laser with a compact design.
To investigate the performance of NPR mode-locking with incomplete isolation of backward-propagating light.
To achieve direct output of sub-40 femtosecond pulses with high average power.

Main Methods:

Utilized a compact Faraday rotator for nonlinear polarization rotation.
Employed a stretched-pulse mode-locking technique in an Yb:fiber laser system.
Operated the laser at a 1.2 GHz repetition rate.

Main Results:

Achieved stable mode-locking at 1.2 GHz with sub-40 femtosecond pulse duration.
Obtained a spectral bandwidth exceeding 70 nm.
Generated over 1 W of average output power.
Demonstrated octave-spanning supercontinuum generation when used as a seed source, without external amplification or compression.

Conclusions:

The compact 1.2 GHz NPR Yb:fiber laser is a significant advancement in ultrafast laser technology.
Incomplete isolation of backward-propagating light does not impede self-starting in this NPR laser configuration.
The laser's performance makes it a suitable seed source for generating broad supercontinua.