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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 11, Iss. 5 — May. 1, 1994
  • pp: 774–785

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

C. D. Marshall, S. A. Payne, M. A. Henesian, J. A. Speth, and H. T. Powell  »View Author Affiliations


JOSA B, Vol. 11, Issue 5, pp. 774-785 (1994)
http://dx.doi.org/10.1364/JOSAB.11.000774


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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. 207, 540 ( 1993)], the transient absorption is broad (~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 ± 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 ± 3 × 10−18 cm2. 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.

© 1994 Optical Society of America

Citation
C. D. Marshall, S. A. Payne, M. A. Henesian, J. A. Speth, and H. T. Powell, "Ultraviolet-induced transient absorption in potassium dihydrogen phosphate and its influence on frequency conversion," J. Opt. Soc. Am. B 11, 774-785 (1994)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-11-5-774

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