Photoacoustic characterization of transient defects in potassium dihydrogen phosphate crystals

Transient defects in potassium dihydrogen phosphate (KDP) were characterized by using the acoustic signals generated in the crystal when it is impinged with pulsed laser radiation. These defects are produced by simultaneous absorption of two λ=266nm photons and they show linear absorption in the vis...

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Detalles Bibliográficos
Autores principales: Martínez Matos, Oscar, Torchia, Gustavo Adrián, Bilmes, Gabriel Mario, Tocho, Jorge Omar
Formato: Articulo
Lenguaje:Inglés
Publicado: 2004
Materias:
Física
Absorption spectroscopy
Optics
Photoacoustic effect
Crystallographic defect
Materials science
Molecular physics
Relaxation (nmr)
Laser
Yttrium
Crystal
Absorption (electromagnetic radiation)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/126079
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-126079
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Absorption spectroscopy
Optics
Photoacoustic effect
Crystallographic defect
Materials science
Molecular physics
Relaxation (nmr)
Laser
Yttrium
Crystal
Absorption (electromagnetic radiation)
spellingShingle Física
Absorption spectroscopy
Optics
Photoacoustic effect
Crystallographic defect
Materials science
Molecular physics
Relaxation (nmr)
Laser
Yttrium
Crystal
Absorption (electromagnetic radiation)
Martínez Matos, Oscar
Torchia, Gustavo Adrián
Bilmes, Gabriel Mario
Tocho, Jorge Omar
Photoacoustic characterization of transient defects in potassium dihydrogen phosphate crystals
topic_facet Física
Absorption spectroscopy
Optics
Photoacoustic effect
Crystallographic defect
Materials science
Molecular physics
Relaxation (nmr)
Laser
Yttrium
Crystal
Absorption (electromagnetic radiation)
description Transient defects in potassium dihydrogen phosphate (KDP) were characterized by using the acoustic signals generated in the crystal when it is impinged with pulsed laser radiation. These defects are produced by simultaneous absorption of two λ=266nm photons and they show linear absorption in the visible and UV spectral region. The decay kinetics of the defects has been studied by a new method based on the analysis of the acoustic signal generated by visible pulses. The acoustic measurement of the decay time shows a nonexponential decay and it is free from thermal lensing or beam deformation by other causes, effects that can alter the pure optical measurements. We propose that the origin of the photoacoustic signal is the heat released by the deexcitation of the energy levels of the defects when they are excited by visible pulses. This mechanism, optical absorption and nonradiative relaxation of defects, could be the reason for some depletion in the yield of several devices based on KDP. This phenomena must be carefully taken in account, when KDP crystals are used in combination with Nd:YAG (YAG, yttrium aluminum garnet) lasers for second-harmonic generation from λ=532nm to λ=266nm.
format Articulo
Articulo
author Martínez Matos, Oscar
Torchia, Gustavo Adrián
Bilmes, Gabriel Mario
Tocho, Jorge Omar
author_facet Martínez Matos, Oscar
Torchia, Gustavo Adrián
Bilmes, Gabriel Mario
Tocho, Jorge Omar
author_sort Martínez Matos, Oscar
title Photoacoustic characterization of transient defects in potassium dihydrogen phosphate crystals
title_short Photoacoustic characterization of transient defects in potassium dihydrogen phosphate crystals
title_full Photoacoustic characterization of transient defects in potassium dihydrogen phosphate crystals
title_fullStr Photoacoustic characterization of transient defects in potassium dihydrogen phosphate crystals
title_full_unstemmed Photoacoustic characterization of transient defects in potassium dihydrogen phosphate crystals
title_sort photoacoustic characterization of transient defects in potassium dihydrogen phosphate crystals
publishDate 2004
url http://sedici.unlp.edu.ar/handle/10915/126079
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AT torchiagustavoadrian photoacousticcharacterizationoftransientdefectsinpotassiumdihydrogenphosphatecrystals
AT bilmesgabrielmario photoacousticcharacterizationoftransientdefectsinpotassiumdihydrogenphosphatecrystals
AT tochojorgeomar photoacousticcharacterizationoftransientdefectsinpotassiumdihydrogenphosphatecrystals
bdutipo_str Repositorios
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