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Fabrication and Characterization of Superconducting Resonators

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Published on: May 21, 2016

Variable-aperture calorimeter for an unstable resonator.

R A Chodzko, S B Mason, R R Giedt

|February 19, 2010

Summary

This summary is machine-generated.

A novel internal-cavity calorimeter, the Variable Aperture Calorimeter Absorbing Scraper (VACAS), precisely measures continuous-wave (cw) edge-coupled unstable resonator output power. This technique optimizes laser mode geometry and power efficiency in chemical lasers.

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Area of Science:

Laser physics
Optical engineering
Materials science

Background:

Edge-coupled unstable resonators are crucial for high-power lasers.
Accurate output power measurement is essential for optimizing laser performance.
Existing methods may not adequately characterize variable mode geometries.

Purpose of the Study:

To develop and validate a new technique for measuring output power from cw edge-coupled unstable resonators.
To apply this technique to a cw Deuterium Fluoride (DF) laser.
To demonstrate the utility of the technique for optimizing laser parameters.

Main Methods:

An internal-cavity calorimeter, the Variable Aperture Calorimeter Absorbing Scraper (VACAS), was designed and implemented.
The VACAS device replaces the conventional output coupling mirror.
It features an absorbing copper plate with a variable rectangular aperture to define the laser mode geometry.

Main Results:

The VACAS device successfully measured output power from a cw DF laser with variable rectangular mode geometry.
The technique allowed for containment of radiation within the resonator during measurement.
Two key applications were demonstrated: optimizing mode geometry for gain variation and analyzing power tradeoffs in folded resonators.

Conclusions:

The VACAS device offers a precise method for measuring output power in cw edge-coupled unstable resonators.
This technique is valuable for optimizing laser performance, particularly in chemical lasers with gain variations.
VACAS facilitates the study of power tradeoffs in different unstable resonator configurations, such as folded designs.