Pyroelectric mechanism of the holographic grating recording

Vinetskiǐ, V. L.; Itskovskii, M. A.

doi:10.1080/00150197808236797

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A Pyroelectric Fields1

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“…3,14 However, photorefractive crystals can be heated by absorbing light and establish a strong pyroelectric field across the whole illuminated (heated) region. 8 The pyroelectric field E pyro can be expressed by…”

Section: A Pyroelectric Fieldsmentioning

confidence: 99%

Transient enhancement of photorefractive gratings in lead germanate by homogeneous pyroelectric fields

Mendricks

Nikolajsen

et al. 1999

J. Opt. Soc. Am. B

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During holographic recording in pure (Pb 5 Ge 3 O 11 ) and doped ͓(Pb 1Ϫx Ba x ) 5 Ge 3 O 11 ͔ lead germanate crystals, the diffraction efficiency is transiently enhanced at the initial stage. The enhancement is studied as a function of writing-beam intensity and of dark delay time between two successive recording processes and with open-or short-circuited crystal surfaces. Homogeneous pyroelectric fields that arise from heating of the crystals by cw illumination are revealed to be the main mechanism for diffraction efficiency enhancement. The combined effect of pyroelectric fields and charge compensation is analyzed and used for the explanation of the observed phenomena.

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Section: A Pyroelectric Fieldsmentioning

confidence: 99%