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Updated: Jul 5, 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

Single-frequency coupled asymmetric microcavity laser.

Lei Shang¹, Liying Liu, Lei Xu

¹Department of Optical Science and Engineering, The State Key Laboratory for Advanced Photonic Materials and Devices, School of Information Science and Engineering, Fudan University, Shanghai 200433, China

|May 17, 2008

Summary

This summary is machine-generated.

Researchers developed a single-frequency microcavity laser by coupling two asymmetric microrings. This approach suppresses unwanted modes, enabling robust, directional laser emission ideal for integrated photonics.

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Area of Science:

Photonics and Optical Engineering
Materials Science

Background:

Microcavity lasers are crucial for integrated photonics.
Whispering-gallery mode (WGM) lasers often suffer from multi-mode emission, limiting their applications.
Achieving single-mode operation in microcavities is a significant challenge.

Purpose of the Study:

To achieve robust single-mode lasing from a microcavity.
To suppress multi-mode emission in whispering-gallery mode lasers.
To develop an easily integrated single-frequency laser source.

Main Methods:

Coupling two size-mismatched circular microrings to create an asymmetric microcavity.
Utilizing the coupled asymmetric microcavity structure to control resonant modes.
Characterizing the laser output for single-frequency operation and beam divergence.

Main Results:

Successfully achieved single-mode lasing from the coupled asymmetric microcavity.
Robustly suppressed multi-whispering-gallery modes, resulting in single-frequency laser emission.
Demonstrated four-directional emission with a low beam divergence of 6.6 degrees.
Showcased easy integration with planar lightwave circuits.

Conclusions:

A coupled asymmetric microcavity is an effective design for achieving single-frequency microcavity lasers.
This method provides an accessible approach to single-mode WGM lasers.
The developed laser is suitable for integration into photonic circuits.