Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Cathode ray
Patent
1988-01-20
1991-10-01
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Cathode ray
324 77K, 324 96, 324158R, G01R 1900, G01R 2316, G01R 3100
Patent
active
050536966
ABSTRACT:
A system for time-resolving ultra-short electrical waveforms of up to a few hundred gigahertz bandwidth is presented. The system utilizes a fast electro-optic modulator capable of subpicosecond responsivity. A CW (continuous wave) laser is used to probe the change in birefringence resulting in the modulator due to an induced electric field. The rapid change in the transmitted optical signal due to an equally rapid changing electric field (picosecond pulse) is then detected and temporally dispersed using a picosecond resolution streak camera. The modulator operates in a region close to minimum transmission where the average optical power is below the damage threshold for the photocathode of the streak camera and where small electrical signals can significantly modulate the transmitted beam. The system can be used in either sampling mode where the modulation and subsequent detection are repeated and the data accumulated at repetition rates as high as 100 MHz or in single shot mode.
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Mourou Gerard A.
Williamson Steven L.
Karlsen Ernest F.
Lukacher Martin
The University of Rochester
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