Beyer, O. and Maxein, D. and Buse, K. and Sturman, B. and Hsieh, H. T. and Psaltis, D. (2005) Femtosecond time-resolved absorption processes in lithium niobate crystals. Optics Letters, 30 (11). pp. 1366-1368. ISSN 0146-9592 http://resolver.caltech.edu/CaltechAUTHORS:BEYol05
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emtosecond 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.
|Additional Information:||© 2005 Optical Society of America Received November 10, 2004 Financial support from the Deutsche Telekom AG, the Deutsche Forschungsgemeinschaft (award BU 913/13-1), and the National Science Foundation (award EEC-9402726 and award INT-0233988) is gratefully acknowledged.|
|Subject Keywords:||Lithium niobate; Multiphoton processes; Ultrafast nonlinear optics|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||11 Aug 2006|
|Last Modified:||26 Dec 2012 08:58|
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