Optical Power Meter
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Disclosed is an optical meter that can measure continuous wave and pulsed laser beams. A fast photodiode converts light pulses into electrical pulses. The electrical pulses are amplified and electronically processed to determine the pulse characteristics. Referring to the figure, photodiode 1 converts pulsed or continuous wave light into a current which is amplified by amplifier 2. For continuous wave, the amplified value is displayed as the average power. For pulse wave, a sample/hold circuit 3 and multiplier 4 is used to obtain the value of peak power. Multiplier 4 provides wavelength correction for the spectral response of photodiode 1. The pulse width is determined via edge-triggered sweep 5 and sample/hold circuit 6. Multiplier 7 determines the energy content of the pulse by multiplying peak power and pulse width.