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Cyclic shearing interferometer for collimating short coherence-length laser beams.

T D Henning, J L Carlsten

|August 20, 2010

Summary

This summary is machine-generated.

Accurately measuring the radius of curvature for short-light sources was challenging. The cyclic shearing interferometer (CSI) now provides a stable method for this measurement, even for beams with short coherence times.

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Area of Science:

Optics and Photonics
Laser Physics
Interferometry

Background:

Accurate measurement of the radius of curvature (R) is crucial for optical systems.
Short coherence-length light sources, like pulsed or broadband lasers, pose challenges for traditional measurement techniques.

Purpose of the Study:

To introduce an accurate and accessible method for measuring the radius of curvature (R) of short coherence-length light sources.
To demonstrate the effectiveness of the cyclic shearing interferometer (CSI) for this application.

Main Methods:

Utilized a cyclic shearing interferometer (CSI) for its ease of alignment and stable fringe pattern generation.
Tested the CSI's capability with light sources exhibiting short coherence times, down to 300 femtoseconds (fs).

Main Results:

The CSI successfully produced stable fringe patterns, enabling accurate determination of the radius of curvature (R).
The interferometer demonstrated efficacy with beams having coherence times as short as 300 fs.
Experimental validation using a broadband XeCl laser (30-ps coherence time) confirmed the CSI's performance aligned with theoretical predictions.

Conclusions:

The cyclic shearing interferometer (CSI) offers a novel and accurate solution for measuring the radius of curvature of short coherence-length light sources.
The CSI's ability to handle short coherence times makes it suitable for a range of challenging laser applications.