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Updated: Jun 3, 2026

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

Mode-locking and Q-switching in multi-wavelength fiber ring laser using low frequency phase modulation.

Chang Su Jun¹, Byoung Yoon Kim

¹Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon, South Korea. tridra@kaist.ac.kr

|April 1, 2011

Summary

This study shows a multi-wavelength fiber ring laser with phase modulation produces pulsed outputs, including mode-locking and Q-switching. The Erbium-doped fiber laser achieved over 8 channels with low relative intensity noise.

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Last Updated: Jun 3, 2026

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Area of Science:

Optics and Photonics
Laser Physics
Fiber Optics

Background:

Multi-wavelength fiber lasers are crucial for various applications, including telecommunications and spectroscopy.
Controlling pulsed output in such lasers is essential for advanced functionalities.
Phase modulation is a known technique to influence laser dynamics.

Purpose of the Study:

To experimentally investigate the pulsed output characteristics of a multi-wavelength fiber ring laser.
To explore the effects of low-frequency, large-amplitude phase modulation on laser output.
To analyze the generation of mode-locking, Q-switching, and chaotic pulses.

Main Methods:

Utilized an Erbium-doped fiber (EDF) ring laser setup.
Incorporated a phase modulator operating at 26.2 kHz and a periodic intra-cavity filter.
Varied pump power and phase modulation amplitude to observe output behavior.

Main Results:

Generated over 8 wavelength channels with pulsed output.
Observed mode-locking at 5.62 MHz and Q-switching at phase modulation harmonics/sub-harmonics.
Characterized chaotic pulse output and analyzed pulse behavior versus pump power and modulation amplitude.
Measured relative intensity noise (RIN) below -100 dB/Hz.

Conclusions:

Low-frequency, large-amplitude phase modulation effectively induces diverse pulsed behaviors in a multi-wavelength EDF ring laser.
The laser demonstrates stable operation with low noise, suitable for applications requiring pulsed multi-wavelength output.
The study provides insights into controlling complex dynamics in fiber lasers through external modulation.