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Related Experiment Video

Updated: Jun 20, 2026

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

Published on: February 25, 2017

Ultrahigh-finesse optical cavities.

C Fabre¹, R G DeVoe, R G Brewer

¹IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099, USA.

|September 5, 2009

Summary

High-finesse Fabry-Perot optical cavities reveal transverse-mode splittings due to minor asymmetry. This finding enables precise optical frequency measurements using optical-radio-frequency dividers.

Area of Science:

Optical physics
Laser spectroscopy

Background:

Fabry-Perot cavities are crucial for high-resolution spectroscopy.
Achieving high finesse is key to resolving fine spectral features.

Purpose of the Study:

To investigate transverse-mode splittings in high-finesse Fabry-Perot cavities.
To understand the impact of cavity asymmetry on spectral resolution.

Main Methods:

Utilizing a highly stabilized ring dye laser.
Employing a Fabry-Perot optical cavity with finesse around 20,000.
Applying perturbative theory to analyze mode splittings.

Main Results:

Transverse-mode splittings were resolved due to narrow fringe widths (approx. 10 kHz).

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Cavity asymmetry, on the order of tenths of a nanometer, was identified as the cause.

The observed splittings correlate with deviations from perfect cylindrical symmetry.

Conclusions:

Understanding mode splittings in high-finesse cavities is essential.
This knowledge facilitates accurate optical frequency measurements.
The findings support the development of optical-radio-frequency dividers.