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Title: Ultraviolet-induced transient absorption in potassium dihydrogen phosphate and its influence on frequency conversion

Abstract

The optical properties of an ultraviolet (266-nm) -induced transient absorption in normal and deuterated potassium dihydrogen phosphate crystals are discussed. Our main contribution has been to analyze this effect quantitatively, assess its effect on ultraviolet (UV) frequency-conversion applications, and examine sample variability. As observed previously [Chem. Phys. Lett. [bold 207], 540 (1993)], the transient absorption is broad ([similar to] 200--700 nm) and is suggested to arise from an induced defect state resulting from the promotion of an electron into the conduction band by two-photon absorption. At room temperature we find that the defect absorption decays over a wide variety of time scales, ranging from fractions of a second to several days, depending on the particular sample under study. The decay time does not appear to be correlated with deuteration or chemical impurities. The temperature-dependent decay rate has an Arrhenius behavior with a single activation energy of 0.51 [plus minus] 0.04 eV for all samples studied, and the decay rate appears to be mediated by a diffusional process as previously postulated. We determined the defect absorption cross section at its spectral peak to be 6 [plus minus] 3 [times] 10[sup [minus]18] cm[sup 2]. Based on these and other measurements, we havemore » numerically modeled previously published experimental data on fourth-harmonic frequency conversion of a Nd:YLF laser and found good agreement when the effects of transient absorption are included.« less

Authors:
; ; ; ;  [1]
  1. Lawrence Livermore National Laboratory, University of California, P.O. Box 808, Livermore, California 94551 (United States)
Publication Date:
OSTI Identifier:
7042367
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Journal of the Optical Society of America, Part B: Optical Physics; (United States)
Additional Journal Information:
Journal Volume: 11:5; Journal ID: ISSN 0740-3224
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS; CRYSTALS; NONLINEAR OPTICS; POTASSIUM PHOSPHATES; FREQUENCY CONVERTERS; ABSORPTION SPECTRA; CROSS SECTIONS; CRYSTAL DEFECTS; FREQUENCY MODULATION; ULTRAVIOLET RADIATION; ALKALI METAL COMPOUNDS; CRYSTAL STRUCTURE; ELECTROMAGNETIC RADIATION; MODULATION; OPTICS; OXYGEN COMPOUNDS; PHOSPHATES; PHOSPHORUS COMPOUNDS; POTASSIUM COMPOUNDS; RADIATIONS; SPECTRA; 661300* - Other Aspects of Physical Science- (1992-); 664200 - Spectra of Atoms & Molecules & their Interactions with Photons- (1992-)

Citation Formats

Marshall, C D, Payne, S A, Henesian, M A, Speth, J A, and Powell, H T. Ultraviolet-induced transient absorption in potassium dihydrogen phosphate and its influence on frequency conversion. United States: N. p., 1994. Web. doi:10.1364/JOSAB.11.000774.
Marshall, C D, Payne, S A, Henesian, M A, Speth, J A, & Powell, H T. Ultraviolet-induced transient absorption in potassium dihydrogen phosphate and its influence on frequency conversion. United States. https://doi.org/10.1364/JOSAB.11.000774
Marshall, C D, Payne, S A, Henesian, M A, Speth, J A, and Powell, H T. 1994. "Ultraviolet-induced transient absorption in potassium dihydrogen phosphate and its influence on frequency conversion". United States. https://doi.org/10.1364/JOSAB.11.000774.
@article{osti_7042367,
title = {Ultraviolet-induced transient absorption in potassium dihydrogen phosphate and its influence on frequency conversion},
author = {Marshall, C D and Payne, S A and Henesian, M A and Speth, J A and Powell, H T},
abstractNote = {The optical properties of an ultraviolet (266-nm) -induced transient absorption in normal and deuterated potassium dihydrogen phosphate crystals are discussed. Our main contribution has been to analyze this effect quantitatively, assess its effect on ultraviolet (UV) frequency-conversion applications, and examine sample variability. As observed previously [Chem. Phys. Lett. [bold 207], 540 (1993)], the transient absorption is broad ([similar to] 200--700 nm) and is suggested to arise from an induced defect state resulting from the promotion of an electron into the conduction band by two-photon absorption. At room temperature we find that the defect absorption decays over a wide variety of time scales, ranging from fractions of a second to several days, depending on the particular sample under study. The decay time does not appear to be correlated with deuteration or chemical impurities. The temperature-dependent decay rate has an Arrhenius behavior with a single activation energy of 0.51 [plus minus] 0.04 eV for all samples studied, and the decay rate appears to be mediated by a diffusional process as previously postulated. We determined the defect absorption cross section at its spectral peak to be 6 [plus minus] 3 [times] 10[sup [minus]18] cm[sup 2]. Based on these and other measurements, we have numerically modeled previously published experimental data on fourth-harmonic frequency conversion of a Nd:YLF laser and found good agreement when the effects of transient absorption are included.},
doi = {10.1364/JOSAB.11.000774},
url = {https://www.osti.gov/biblio/7042367}, journal = {Journal of the Optical Society of America, Part B: Optical Physics; (United States)},
issn = {0740-3224},
number = ,
volume = 11:5,
place = {United States},
year = {1994},
month = {5}
}