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Temperature-scanned Fabry-Perot interferometer using a graded-index rod.

¹Institute of Materials Science, University of Tsukuba, Sakura-mura, Ibaraki 305, Japan.

|September 3, 2009

Summary

A miniature Fabry-Perot interferometer using a graded-index rod analyzes gas laser spectra. This device easily measures axial modes, intensities, and frequency separation by scanning optical path length with temperature.

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Area of Science:

Optics and Photonics
Laser Physics
Spectroscopy

Background:

Fabry-Perot interferometers are crucial for optical spectrum analysis.
Miniaturization of optical instruments is a key research trend.
Graded-index materials offer unique optical properties.

Purpose of the Study:

To describe a simple, miniature Fabry-Perot interferometer.
To demonstrate its application in gas laser spectrum observation.
To enable straightforward measurement of laser parameters.

Main Methods:

Constructing a Fabry-Perot interferometer using a graded-index rod.
Scanning the interferometer's optical path length via temperature variation.
Utilizing the device to observe a gas laser's spectrum.

Main Results:

The graded-index rod interferometer functions effectively for spectral observation.
The number of axial modes in the gas laser was determined.
Relative intensities and frequency separation of modes were readily measured.

Conclusions:

A simple and miniature Fabry-Perot interferometer can be fabricated from a graded-index rod.
This device provides an accessible method for analyzing gas laser spectra.
It facilitates the determination of key spectral characteristics like mode structure and spacing.