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UV-induced two-photon absorption in BiB3O6 single crystals |
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| Authors: | A Majchrowski J Kisielewski E Michalski K Ozga IV Kityk T Lukasiewicz |
| Institution: | aInstitute of Applied Physics, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland bInstitute of Electronic Materials Technology, 133 Wolczanska Str., 01-919 Warsaw, Poland cInstitute of Biology and Biophysics, Technical University of Czestochowa, Al. Armii Krajowej 36, Czestochowa, Poland dInstitute of Physics AJD Czestochowa, Solid State Department, J. Dlugosz University of Czestochowa, Al. Armii Krajowej 1315, 42201 Czestochowa, Poland |
| Abstract: | We show that BiB3O6 (BiBO) crystals, well known for their excellent second harmonic generation (SHG) properties, may also be of interest for third-order optical phenomena, particularly for two-photon absorption (TPA). Photoinduced TPA measurements were performed under illumination of excimer Xe–F laser (λ = 217 nm) as a photoinducing (pumping) beam. It created a thin surface layer (about 85 nm) that was a source of the observed photoinduced TPA. Raman shifted Nd-YAG laser radiation (λ = 1.9 μm) as well as its second and fourth harmonics (λ = 950 and λ = 475 nm, respectively) were used as fundamental (probing) beams of the TPA. The highest values of the TPA β coefficient were achieved for a polarization of the pumping light directed along crystallographic axis b. Quantum chemical simulations indicate on substantial contribution of UV-induced electron–phonon anharmonicity to the observed TPA. The obtained values of TPA coefficients indicate a possibility of using BiBO crystals as UV-operated optical limiters in a wide spectral range. |
| Keywords: | Two-photon absorption Non-linear optics materials |
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