UV-induced two-photon absorption in BiB3O6 single crystals

作者：Majchrowski A; Kisielewski J; Michalski E; Ozga K; Kityk IV^*; Lukasiewicz T

来源：Optics Communications, 2005, 250(4-6): 334-343.

DOI：10.1016/j.optcom.2005.02.053

• two-photon absorption
• non-linear optics materials

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 (lambda = 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 (lambda = 1.9 mu m) as well as its second and fourth harmonics (lambda = 950 and lambda = 475 nm, respectively) were used as fundamental (probing) beams of the TPA. The highest values of the TPA beta 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.

• 出版日期2005-6-15