Abstract
Processes of photo-induced light scattering are studied in single crystals of LiNbO(3):Fe to uncover the origin of a new part of the entire scattering pattern which can be observed on a viewing screen. The new scattering manifests itself as two arcs enclosing the directly transmitting pump beam. It is shown that this type of scattering is due to a parametric wave-mixing process of coherent optical noise and a pump beam on a combination of photorefractively recorded phase-gratings and photo-induced ferroelectric structures. Phase-matching conditions corresponding to the new scattering are introduced. All photo-induced scattering phenomena contributing to the total scattering pattern are discussed, compared and classified.
Highlights
IntroductionThis contribution is devoted to a new type of parametric multi-wave mixing on a combination of photorefractive gratings and ferroelectric polar structures both induced by a single laser pump beam in photosensitive ferroelectrics
“Czochralski-grown lithium niobate with regular domain structure,” Ferroelectrics 190, 107–112 (1997). This contribution is devoted to a new type of parametric multi-wave mixing on a combination of photorefractive gratings and ferroelectric polar structures both induced by a single laser pump beam in photosensitive ferroelectrics
We report on parametric multi-wave mixing on the combination of photorefractive gratings together with bulk variations of the ferroelectric domain structure all induced by one pump beam of moderate intensity
Summary
This contribution is devoted to a new type of parametric multi-wave mixing on a combination of photorefractive gratings and ferroelectric polar structures both induced by a single laser pump beam in photosensitive ferroelectrics. The study is performed with the nonlinear optical phenomenon of photo-induced light scattering (PILS) in a-cut samples of single-domain LiNbO3:Fe. The crystal is characterized by a pronounced photorefractive effect, which is utilized for the recording of volume phase gratings in many optical applications [1]. The PILS phenomenon is the result of different wave mixing processes between scattered and transmitted parts of the pump beam on noisy photorefractive gratings. This is why a large number of such processes can be observed and studied with the help of the PILS phenomenon [2]. The discovered effect was not due to any wave mixing which could further result in an effective light amplification
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