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Optics Letters

Optics Letters


  • Vol. 30, Iss. 11 — Jun. 1, 2005
  • pp: 1366–1368

Femtosecond time-resolved absorption processes in lithium niobate crystals

O. Beyer, D. Maxein, K. Buse, B. Sturman, H. T. Hsieh, and D. Psaltis  »View Author Affiliations

Optics Letters, Vol. 30, Issue 11, pp. 1366-1368 (2005)

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Femtosecond pump pulses are strongly attenuated in lithium niobate owing to two-photon absorption; the relevant nonlinear coefficient beta_p ranges from ∼3.5 cm/GW for lambda_p = 388 nm to ∼0.1 cm/GW for 514 nm. In collinear pump-probe experiments the probe transmission at the double pump wavelength 2lambda_p=776 nm is controlled by two different processes: A direct absorption process involving pump and probe photons (beta_r ~ or = 0.9 cm/GW) leads to a pronounced short-duration transmission dip, whereas the probe absorption by pump-excited charge carriers results in a long-duration plateau. Coherent pump-probe interactions are of no importance. Hot-carrier relaxation occurs on the time scale of < or ~0.1 ps.

© 2005 Optical Society of America

OCIS Codes
(160.3730) Materials : Lithium niobate
(190.4180) Nonlinear optics : Multiphoton processes
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

O. Beyer, D. Maxein, K. Buse, B. Sturman, H. T. Hsieh, and D. Psaltis, "Femtosecond time-resolved absorption processes in lithium niobate crystals," Opt. Lett. 30, 1366-1368 (2005)

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