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Updated: Jun 16, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Variable metal mesh coupler for far infrared lasers.

R Ulrich, T J Bridges, M A Pollack

|January 23, 2010

Summary

This summary is machine-generated.

A novel infrared interference filter replaces traditional mirrors in far infrared lasers, enabling variable output coupling. This optimization enhances laser power, improves beam quality, and aids in gain determination.

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Area of Science:

Optics and Photonics
Laser Physics
Spectroscopy

Background:

Traditional pierced output mirrors in far infrared lasers present limitations in coupling efficiency and beam quality.
Optimizing laser output coupling is crucial for maximizing power and maintaining beam characteristics.

Purpose of the Study:

To introduce and characterize a novel variable infrared interference filter for far infrared molecular lasers.
To demonstrate the advantages of this filter over traditional output coupling methods.
To utilize the filter for determining the laser's linear gain.

Main Methods:

Development of a variable reflector using two parallel metal mesh grids.
Theoretical analysis and experimental validation of the interference filter's performance.
Comparison of interference filter coupling with traditional hole coupling.

Main Results:

The interference filter allows adjustable reflectance by varying the spacing between metal mesh grids.
Uniform coupling across the reflector's cross-section was achieved, reducing diffraction losses.
Improved angular distribution of the output laser beam was observed.
The variable reflector was successfully employed to measure the laser's linear gain.

Conclusions:

The infrared interference filter offers a superior alternative to pierced mirrors for far infrared lasers.
Variable coupling enhances laser performance, including power output and beam quality.
This technology provides a new tool for laser characterization, such as gain measurement.