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Applied Physics B

, Volume 70, Issue 3, pp 385–388 | Cite as

Nonlinear refraction of undoped and Fe-doped KTiOAsO4 crystals in the femtosecond regime

  • H.P. Li
  • C.H. Kam
  • Y.L. Lam
  • F. Zhou
  • W. Ji

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 wavelength. 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.

PACS: 42.65; 42.70; 42.87 

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Copyright information

© Springer-Verlag 2000

Authors and Affiliations

  • H.P. Li
    • 1
  • C.H. Kam
    • 1
  • Y.L. Lam
    • 1
  • F. Zhou
    • 1
  • W. Ji
    • 2
  1. 1.Photonics Laboratory, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore(Fax: + 65-7912687, E-mail: ehpli@ntu.edu.sg)SG
  2. 2.Department of Physics, National University of Singapore, Lower Kent Ridge Road, Singapore 119260, SingaporeSG

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