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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 2002),
  • paper CWA20

Photogalvanic Pulsator

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Abstract

We have observed conversion of CW Ar-ion laser irradiation into pulsating optical and electromagnetic signals (EMS). Pulsating optical scattering from the crystal have distinct spatial structure in the form of expanding circular rings or bright crosses. Simultaneously, strong EMS is emitted from the crystal with the bandwidth about 1 GHz at 10% signal level (Fig. 1). EMS was detected by the antenna-type electrode and analyzed by oscilloscope. Rise time of 2 ns for the 3 mm thick sample of lithium niobate with total pulse width about 2 ms. The interval between pulses decreases with growing laser power and is about 1 s for CW power 200 mW at λ = 488 nm. Maximal detected signal was about 2 V with oscilloscope impedance in 1 MΩ at the antenna electrode near the rear face of the crystal. This signal decays 10 times, when antenna shifted at 6 cm from the crystal, fwo electrodes, placed on the opposite sides of the crystal, picked up out-of-phase signal.

© 2002 Optical Society of America

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