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Related Experiment Video

Updated: Jan 18, 2026

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

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Narrow-linewidth monolithic topological interface state extended laser with optical injection locking.

Xiao Sun¹, Zhibo Li¹, Yiming Sun¹

¹James Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK.

Science Advances

|September 10, 2025

Summary

This summary is machine-generated.

This study demonstrates a novel monolithic optical injection locking topological interface state extended (MOIL-TISE) laser. This advanced laser significantly narrows linewidths for enhanced coherent optical applications.

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Last Updated: Jan 18, 2026

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Area of Science:

Optoelectronics
Photonics
Semiconductor Lasers

Background:

Narrow-linewidth lasers are critical for coherent optical systems like communications and sensing.
Achieving high spectral purity typically requires external cavities, limiting device compactness.
Semiconductor lasers offer miniaturization but often struggle with spectral purity.

Purpose of the Study:

To theoretically and experimentally demonstrate a monolithic optical injection locking topological interface state extended (MOIL-TISE) laser.
To achieve efficient photon injection and significant linewidth narrowing within a single integrated device.
To explore the potential of MOIL-TISE lasers for advanced optical applications.

Main Methods:

Monolithic integration of a topological interface state extended (TISE) laser with a micro-ring resonator.
Utilizing an AlGaInAs multiple quantum-well platform for device fabrication.
Experimental characterization of laser performance, including linewidth, side-mode suppression ratio, and operational stability.

Main Results:

Stable single-mode operation was achieved across a broad injection current range (65–300 mA).
A side-mode suppression ratio exceeding 50 dB was experimentally verified.
The laser's Voigt linewidth was dramatically reduced from 2 MHz to 4.2 kHz, with an intrinsic linewidth of 983 Hz.

Conclusions:

The monolithic MOIL-TISE laser architecture enables efficient linewidth narrowing.
The demonstrated device shows significant potential for applications in coherent communications.
The technology is promising for modulation-free quantum key distribution due to its high spectral purity.