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Related Experiment Video

Updated: Sep 28, 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

Dual-dispersion-regime dual-comb mode-locked laser.

Maciej Kowalczyk, Łukasz A Sterczewski, Xuzhao Zhang

|April 1, 2022

Summary

This study introduces the first solid-state dual-comb laser operating in varied dispersion regimes. It generates two distinct pulse trains from a single cavity, enabling dual-comb spectroscopy applications.

Area of Science:

Laser Physics
Nonlinear Optics
Spectroscopy

Background:

Mode-locked lasers are crucial for generating ultrashort pulses.
Dual-comb lasers offer unique capabilities for spectroscopy.
Operating in different dispersion regimes within a single laser cavity presents significant challenges.

Purpose of the Study:

To demonstrate the first solid-state dual-comb mode-locked laser.
To achieve simultaneous operation in anomalous and normal dispersion regimes.
To investigate dual pulse generation with significantly different durations.

Main Methods:

Utilized a birefringent Ytterbium-doped Calcium Niobium Gallium Silicate (Yb:CNGS) gain medium.
Engineered the laser cavity to achieve a net group delay dispersion crossing zero across the gain bandwidth.

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Last Updated: Sep 28, 2025

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

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Published on: November 22, 2019

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Published on: February 4, 2017

Exploited intrinsic polarization multiplexing for dual-comb generation.

Main Results:

Successfully generated two cross-polarized pulse trains with a repetition rate offset of ~4.8 kHz.
Achieved dual pulse generation with a 20-fold difference in duration (117 fs vs. 2360 fs).
Produced soliton-like pulses in the anomalous dispersion regime and chirped pulses in the normal dispersion regime.

Conclusions:

The developed laser is the first solid-state dual-comb laser operating in different dispersion regimes.
This dual-comb laser offers a novel platform for advanced spectroscopic techniques.
The ability to generate pulses of vastly different durations opens new avenues for research.