title: UV-induced nonlinear absorption in lanthanum calcium borate single crystals.
abstract: It has been revealed that lanthanum calcium borate (La2CaB10O19) crystals show two-photon absorption (TPA) induced by a UV laser field. UV-induced TPA measurements were performed in the spectral range of 475-1130 nm using as fundamental beam the third harmonics of the 28 ps Nd-YAG pulsed laser as a pumping beam for LiB3O5 optical parametrized generator using Z-scan method. Investigations performed by the Z-scan method were done during illumination by a Xe-F laser (lambda = 217 nm) as a photoinducing (pumping) beam. The pumping laser beam created a thin surface layer (about 80-90 nm) that was the source of the observed photoinduced TPA. The highest values of the TPA beta coefficients were achieved for polarization of the pumping light directed along the second-order crystallographic axis of the investigated crystals. The obtained values of the TPA coefficients were higher than those for the BiB3O6 crystals investigated earlier by us.
authors: Institute of Physics, J. Dlugosz Academy of Czestochowa, Al. Armii Krajowej 13/15, Czestochowa, Poland. i.kityk@ajd.czest.pl
authors: I V
authors: IV
authors: Kityk
authors: A
authors: A
authors: Majchrowski
authors: E
authors: E
authors: Michalski
authors: D
authors: D
authors: Kasprowicz
authors: M
authors: M
authors: Drozdowski
authors: J
authors: J
authors: Kisielewski
authors: T
authors: T
authors: Lukasiewicz
authors: B
authors: B
authors: Sahraoui