The Fast Photorefractive Effect and Its Application to Vibrometry
We previously reported on what we describe as the “fast photorefractive effect,” photorefractive signal amplification at much greater frequencies than predicted by its grating formation speed. In this paper we explain the effect and its potential for application to vibrometry. We demonstrated photorefractive amplification in Cu:KNSBN (whose grating formation speed is <5 Hz), matching the standard model with CW illumination. We then demonstrated photorefractive amplification of vibrometric signals at frequencies up to 2 MHz. Our theory of the fast photorefractive effect indicates that the amplification bandwidth of Cu:KNSBN at 488 nm illumination could exceed 800 GHz.
Keywords: CU:KNSBN; FAST PHOTOREFRACTIVE EFFECT; LONG-RANGE DETECTION; PHOTOREFRACTIVITY; VIBROMETRY
Document Type: Research Article
Publication date: 01 August 2009
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