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Absolute reference calorimeter for measuring high power laser pulses.

D L Franzen, L B Schmidt

|February 20, 2010

Summary

This summary is machine-generated.

A new calorimeter accurately measures high-power laser pulse energy using solid volume absorption. This device is electrically calibrated, requires no vacuum, and offers precise measurements for infrared and visible lasers.

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Area of Science:

Optics and Photonics
Laser Technology
Metrology

Background:

Accurate energy measurement of high-power laser pulses is crucial for various scientific and industrial applications.
Existing calorimeters often require vacuum environments or specific windows, limiting their versatility.
The development of robust, self-contained calorimeters is essential for reliable laser diagnostics.

Purpose of the Study:

To describe a novel calorimeter designed for absolute energy measurements of high-power laser pulses.
To present an instrument that utilizes volume absorption in a solid material.
To detail the electrical calibration, error analysis, and performance characteristics of the calorimeter.

Main Methods:

The calorimeter employs volume absorption within a solid material for energy detection.
It is calibrated using an electrical method, eliminating the need for optical windows.
Performance was evaluated by measuring systematic and random errors across its operational range.

Main Results:

The calorimeter features a 32-mm x 32-mm aperture with an energy range of 0.4-15 Joules.
Typical performance includes a random error of +/-0.2% and a systematic error of +/-2.3%.
An upper operational limit of 3 J/cm(2) was established, with applicability from near-infrared through visible wavelengths.

Conclusions:

The described calorimeter provides accurate, absolute energy measurements for high-power laser pulses.
Its design, based on solid volume absorption and electrical calibration, offers advantages in terms of simplicity and robustness.
The instrument is suitable for a wide range of laser applications, including those using CO(2) lasers with specific absorbers.