Accession Number:

AD0911195

Title:

An Absolute Method of Measuring Energy Outputs from CO2 Lasers.

Descriptive Note:

Research rept.,

Corporate Author:

AVCO EVERETT RESEARCH LAB INC EVERETT MA

Report Date:

1973-04-01

Pagination or Media Count:

23.0

Abstract:

In the energy meter described here the CO2 laser radiation is almost completely absorbed by an Al2O3 surface on an aluminum plate. The high absorbtion of the surface greater than 95 eliminates the need for calibration and the laser energy is computed by measuring the temperature rise of a plate with known thermal capacity. Experimentally we find that the calorimeter noise level corresponds to an energy density of about 2 mJoulessq cm. Calculations indicate that the instrument is capable of measuring the energy of a single pulse that is 1 nsec wide, provided the pulse contains an average energy density of 10 mJoulessq cm. We have estimated the radiation and convection losses and found them to be negligible. The calorimeter is good for radiation between 8.5 and 11 microns however, with modifications the bandwidth could easily be increased. Author

Subject Categories:

  • Lasers and Masers

Distribution Statement:

APPROVED FOR PUBLIC RELEASE