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Updated: Jun 17, 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

A recording sampling system for measuring laser energy.

R C Williams¹, H A Mueller

¹Department of Biophysics, MedicalCollege of Virginia, Richmond, USA.

|January 6, 2010

Summary

This summary is machine-generated.

A new apparatus accurately measures laser energy on biological systems. This direct-reading system offers simple calibration and waveform reproduction for laser safety and research.

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Area of Science:

Biophysics
Optical Engineering
Laser Safety

Background:

Accurate measurement of laser energy is crucial for biological applications and safety.
Existing methods may lack direct reading capabilities, require operator attention, or offer limited waveform reproduction.

Purpose of the Study:

To design and build an apparatus for simultaneous measurement of laser energy incident on biological systems.
To provide a direct-reading, high-accuracy system with waveform reproduction capabilities.

Main Methods:

Utilized a fast photodiode (S-1 cathode) for broad wavelength detection (ruby and neodymium lasers).
Incorporated a high-quality integrating capacitor and a servo-controlled pump diode for dark current balance.
Enabled waveform observation using a Tektronix oscilloscope and P-80 probe for power-level measurements.

Main Results:

Achieved reproducibility better than 3% compared to a calibrated blackbody receiver (cone radiometer).
Demonstrated simple and direct absolute calibration through comparison with a cone radiometer.
The system provides a permanent record and true integration of pulse trains.

Conclusions:

The developed apparatus offers a reliable, accurate, and user-friendly solution for measuring laser energy in biological contexts.
Its direct-reading nature and waveform reproduction capabilities enhance laser safety protocols and experimental precision.