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Related Experiment Video

Updated: Nov 17, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Direct chip-scale optical frequency divider via regenerative harmonic injection locking.

Ricardo Bustos-Ramirez, Lawrence R Trask, Ashish Bhardwaj

|February 12, 2021

Summary

This summary is machine-generated.

Researchers developed a new optical frequency division method to transfer timing stability from a 300 GHz optical frequency comb to a 10 GHz laser. This technique achieves high stability with minimal optical power.

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Last Updated: Nov 17, 2025

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Published on: December 15, 2021

Area of Science:

Photonics and Optical Engineering
Laser Physics
Frequency Metrology

Background:

Optical frequency combs (OFCs) provide highly stable frequency references.
Chip-scale lasers offer compact and versatile platforms for optical applications.
Transferring OFC stability to lower repetition rate lasers is crucial for various applications.

Purpose of the Study:

To demonstrate a novel optical frequency division technique.
To transfer the timing stability of a millimeter-wave OFC to a chip-scale laser.
To achieve a 30x optical frequency division with high stability and low power consumption.

Main Methods:

Regenerative harmonic injection locking technique.
Utilizing a coupled opto-electronic oscillator to assist injection locking.
Employing a ∼300 GHz optical frequency comb and a ∼10 GHz chip-scale mode-locked laser.

Main Results:

Successful optical frequency division by a factor of 30×, reducing the repetition rate from 300 GHz to 10 GHz.
Achieved timing stability of ∼10⁻¹² at 1 s with a 1/τ trend in the locked laser.
Demonstrated power-efficient locking using less than 100 µW of optical power.

Conclusions:

Regenerative harmonic injection locking is an effective method for optical frequency division.
This technique enables the transfer of high timing stability to chip-scale lasers.
The power efficiency makes this method suitable for integrated photonic systems.