Abstract
This article presents a joulemeter that permits us to measure the beam energy of a pulsed ruby laser from the HLS-3 holographic system at the recording photosensitive surface of the holographic plate. This is an inexpensive alternative to commercially obtainable energy measuring silicon detectors. The joulemeter contains a photodiode used in the photoconductive mode, an integrating circuit, and a buffer amplifier. The output signal is displayed on the screen of a digital storage oscilloscope. We have tested the joulemeter for different photodetectors. The best responsivity, 3 V/J, was obtained with the BPW21 photodetector. Its possible to measure the energy of a different pulsed laser, by using a photodetector adapted for the laser wavelength and to change the energy domain by changing the attenuators.
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