{"title":"Self-Pumped Phase Conjugation in Barium Titanate with High Intensity Nanosecond Pulses","authors":"M. Damzen, N. Barry","doi":"10.1364/pmed.1991.wc2","DOIUrl":null,"url":null,"abstract":"An investigation of self-pumped phase conjugation in barium titanate is made using nanosecond pulses (15 ns) derived from a repetitively pulsed (10 Hz) and frequency-doubled Nd:YAG laser system (532 nm wavelength). It is experimentally shown that high reflectivity (> 20 %) can be achieved. It is also shown that there is a progressive decrease in the reflectivity of both the corner-pumped and ring-passive geometries at pulse intensities of > 4 MW/cm2. At these intensity levels a high photo-carrier population is induced, altering the relative concentrations of Fe2+ and Fe3+ centres and leading to a strong intensity-dependent competition between hole and electron photoconductivity.","PeriodicalId":355924,"journal":{"name":"Photorefractive Materials, Effects, and Devices","volume":"49 2","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1992-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Photorefractive Materials, Effects, and Devices","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1364/pmed.1991.wc2","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
An investigation of self-pumped phase conjugation in barium titanate is made using nanosecond pulses (15 ns) derived from a repetitively pulsed (10 Hz) and frequency-doubled Nd:YAG laser system (532 nm wavelength). It is experimentally shown that high reflectivity (> 20 %) can be achieved. It is also shown that there is a progressive decrease in the reflectivity of both the corner-pumped and ring-passive geometries at pulse intensities of > 4 MW/cm2. At these intensity levels a high photo-carrier population is induced, altering the relative concentrations of Fe2+ and Fe3+ centres and leading to a strong intensity-dependent competition between hole and electron photoconductivity.
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