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Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

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Unstable resonators for annular gain volume lasers.

P B Mumola, H J Robertson, G N Steinberg

|March 4, 2010

Summary

This study details the performance of unstable resonators for annular cylindrical lasers. A half-symmetric unstable resonator with an intracavity axicon achieved near diffraction-limited laser beam quality.

Area of Science:

Optics and Photonics
Laser Physics
Resonator Design

Background:

Unstable resonators are crucial for high-power laser systems.
Controlling beam quality in lasers with annular cylindrical mode volumes presents unique challenges.
Previous research has explored various resonator configurations, but optimization for specific laser types remains an active area.

Purpose of the Study:

To experimentally evaluate the performance of different unstable resonators for annular cylindrical mode volumes.
To investigate the impact of resonator component misalignments and figure errors on laser output beam quality.
To demonstrate a resonator design capable of achieving near diffraction-limited beam quality in a He-Xe laser.

Main Methods:

Fabrication and testing of several unstable resonator configurations for annular cylindrical lasers.

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Characterization of laser output beam quality using standard optical metrology techniques.

Analysis of sensitivity to mechanical misalignments and optical surface imperfections.

Main Results:

Experimental performance data for multiple unstable resonator designs were collected.
The sensitivity of laser beam quality to resonator component errors was quantified.
A half-symmetric unstable resonator incorporating an intracavity axicon yielded near diffraction-limited beam quality.

Conclusions:

The tested unstable resonators show varying degrees of suitability for annular cylindrical lasers.
Careful design and alignment are critical for maintaining high beam quality in these systems.
The demonstrated resonator configuration offers a promising approach for achieving high-quality output from annular cylindrical He-Xe lasers.