RT Journal Article
T1 Photoacoustic characterization of transient defects in potassium dihydrogen phosphate crystals
A1 Martínez Matos, Óscar
A1 Torchia, Gustavo Adrián
A1 Bilmes, Gabriel M.
A1 Tocho, Jorge Omar
AB 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.
PB American Physical Society
SN 1098-0121
YR 2004
FD 2004-06
LK https://hdl.handle.net/20.500.14352/51027
UL https://hdl.handle.net/20.500.14352/51027
LA eng
NO ©2004 The American Physical Society.We thank H. F. Ranea Sandoval for participating in many useful discussions. This work was partially financed by Projects (Grant Nos. 11X/324 and 11/I 067) of Universidad Nacional de La Plata and Project (Grant No. 03-08852) of ANPCYT.
NO Universidad Nacional de La Plata, Argentina.
NO Agencia Nacional de Promoción Científica y Tecnológica (ANPCYT), Argentina.
DS Docta Complutense
RD 31 dic 2025