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Title: Nonlinear refraction of undoped and Fe-doped KTiOAsO4 crystals in the femtosecond regime
Authors: Li, H.P.
Kam, C.H.
Lam, Y.L.
Zhou, F.
Ji, W. 
Issue Date: Mar-2000
Citation: Li, H.P.,Kam, C.H.,Lam, Y.L.,Zhou, F.,Ji, W. (2000-03). Nonlinear refraction of undoped and Fe-doped KTiOAsO4 crystals in the femtosecond regime. Applied Physics B: Lasers and Optics 70 (3) : 385-388. ScholarBank@NUS Repository.
Abstract: The third-order optical nonlinearities in undoped and Fe-doped KTA crystals have been measured using the Z-scan technique with femtosecond pulses at 780-nm wave-length. The nonlinear refractive index is determined to be 1.7 × 10-15 cm2/W and 0, 9 × 10-15 cm2/W for undoped and Fe-doped KTA, respectively. No two-photon absorption occurs in these crystals. It is shown that doping with Fe2O3 could weaken refractive nonlinearity of KTA, suggesting that Fe:KTA will improve the performance of KTA in high-intensity femtosecond laser applications. In addition, the measured nonlinear index of refraction in KTA crystals is about five times lower than that predicted by the two-band theory. One of the reasons for the discrepancy is given as the applicable limit of the simple theory in which a two-parabolic band model has been assumed in the analysis.
Source Title: Applied Physics B: Lasers and Optics
ISSN: 09462171
Appears in Collections:Staff Publications

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