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Optical parallelism measurement of ruby laser rods.

T K Wang, P C Tsui, I C Kuo

|February 4, 2010

Summary

This summary is machine-generated.

A new method uses laser light interference to check ruby rod optical parallelism. This ensures ruby rods are suitable for E-ray oscillation laser systems by assessing both mechanical and lineage-induced wedge angles.

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Area of Science:

Optics
Laser Physics
Materials Science

Background:

Optical parallelism of laser components is critical for system performance.
Ruby rods are key elements in certain laser systems, requiring precise alignment.
Existing methods for assessing parallelism may not account for internal material properties.

Purpose of the Study:

To propose a simple, effective method for examining optical parallelism in ruby rods.
To establish a criterion for ruby rod suitability in E-ray oscillation laser systems.
To investigate the influence of both mechanical and lineage-induced wedge angles on optical parallelism.

Main Methods:

Illumination of a ruby rod with an expanded, linearly polarized He-Ne laser beam.
Observation of interference patterns formed by the recombination of extraordinary (E) and ordinary (O) rays.
Analysis of the interference pattern using a Polaroid analyzer to assess optical parallelism.

Main Results:

The interference pattern directly visualizes the optical parallelism of the ruby rod's end faces.
The observed parallelism is influenced by the mechanical wedge angle and the equivalent wedge angle due to lineage.
The method provides a clear indication of the ruby rod's suitability for E-ray oscillation lasers.

Conclusions:

A straightforward optical interference method can reliably assess ruby rod parallelism.
Optical parallelism is a crucial factor for ruby rod selection in E-ray laser systems.
The method accounts for intrinsic material properties (lineage) affecting optical alignment.