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1. (WO1999010716) ENERGY MEASURING INSTRUMENT FOR A PULSED LASER

Pub. No.:    WO/1999/010716    International Application No.:    PCT/EP1998/005369
Publication Date: Mar 4, 1999 International Filing Date: Aug 25, 1998
IPC: G01J 11/00
G01N 29/04
G01N 29/14
G01N 29/24
Applicants: STEVENS, Heinrich
WRIGHT, Steven
Inventors: STEVENS, Heinrich
WRIGHT, Steven
Title: ENERGY MEASURING INSTRUMENT FOR A PULSED LASER
Abstract:
The invention relates to an energy measuring instrument for a pulsed laser. The novel energy measuring instrument detects the energy of a laser pulse using the photo acoustic effect. The light pulses are absorbed by a robust absorber (3) in a hollow chamber (10). The resulting heating of the air in said hollow chamber leads to a pressure pulse which is detected by a microphone (6). The novel energy measuring instrument is suitable for measuring low laser energies (νJ to mJ). The measuring instrument is also suitable for measuring stronger laser energies (νJ to mJ) during further execution which contains an expanded dynamic. The application of the measuring instrument is used in the areas of measuring, treatment of materials and medicine.