Two-photon-absorption of frequency converter crystals at 248 nm

• Published in: Applied physics. B, Lasers and optics Vol. 81; no. 8; pp. 1123 - 1126
• Main Authors: DIVALL, M, OSVAY, K, KURDI, G, DIVALL, E. J, KLEBNICZKI, J, BOHUS, J, PETER, A, POLGAR, K
• Format: Journal Article
• Language: English
• Published: Berlin Springer 01.12.2005
• Subjects: Coefficients; Crystals; Exact sciences and technology; Excimer lasers; Frequency conversion ; harmonic generation, including high-order harmonic generation; Frequency converters; Fundamental areas of phenomenology (including applications); Lasers; Nonlinear optics; Optical parametric oscillators and amplifiers; Optical susceptibility, hyperpolarizability; Optics; Physics; Simulation; Frequency converters; Light matter interaction; Theoretical study; Cesium Lithium Borates; Experimental device; Experimental study; Barium Metaborates; Krypton fluoride lasers; Ultrashort pulse; Lithium Borates; Laser pulse; KDP; Subpicosecond; Excimer lasers; Two photon absorption; Optical frequency conversion; Gas lasers; Nonlinear optics; ps range
• ISSN: 0946-2171; 1432-0649
• DOI: 10.1007/s00340-005-1954-7

The two-photon-absorption coefficient of KDP, BBO, LTB, and CLBO crystals has been determined from the measurement of the intensity dependent transmission through long samples. The intensity of the sub-picosecond KrF excimer laser pulses on the samples was varied from 0.2--80 GW/cm. The linear absorption of the samples was determined by using a low intensity, long pulse KrF laser. The first-principle simulations to the experimental data show a TPA value of 0.48 cm/GW for KDP, 0.5 cm/GW (o-ray) and 0.34 cm/GW (e-ray) in BBO, 0.22 cm/GW in LTB and 0.53 cm/GW in CLBO.