Absolute energy reference calorimeter with bismuth telluride thermocouples for laser energy standard
- National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1, Tsukuba, Ibaraki 305-8563 (Japan)
A highly sensitive calorimeter has been developed for measuring the absolute energy of single laser pulses. The calorimeter, which consists of a solid volume absorber, a copper absorption cavity, and bismuth telluride thermocouples, is operated at room temperature with no vacuum window. The absorption of the laser energy in the calorimeter leads to a temperature increase of the cavity. The time-dependent temporal temperature change was measured as voltage signals with highly sensitive bismuth telluride semiconductor thermocouples. The calorimeter was calibrated by injecting a known Joule heat with a heater on the cavity. The experimental results showed a linear relationship in an energy range from 5 to 100 mJ. The standard deviation of the calibrated sensitivity was less than 0.1%. The systematic errors of the laser energy measurement are estimated to be as small as 0.32%.
- OSTI ID:
- 20723236
- Journal Information:
- Review of Scientific Instruments, Vol. 76, Issue 11; Other Information: DOI: 10.1063/1.2135286; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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