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Transient transmission oscillations in doped and undoped lithium niobate induced by near-infrared femtosecond pulses

Published online by Cambridge University Press:  09 November 2018

Bryan J. Crossman  and
Gregory J. Taft Open the ORCID record for Gregory J. Taft [Opens in a new window]
Bryan J. Crossman
Affiliation:
Department of Physics, College of St. Benedict/St. John’s University, Collegeville, Minnesota 56321, USA
Gregory J. Taft*
Affiliation:
Department of Physics, College of St. Benedict/St. John’s University, Collegeville, Minnesota 56321, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Transient transmission oscillations in X-cut and Z-cut congruent, iron-doped, and magnesium-doped lithium niobate samples were measured using 50 fs, 800 nm, 0.5 nJ pulses from a self-mode-locked Ti:sapphire laser in an optical pump–probe system. Several Raman-active oscillation modes excited by these pulses were observed as changes in the transmitted probe intensity versus time delay between the pump and probe pulses. The samples were rotated to determine how the incident polarization of the pump pulses affects the mode excitations. The observed Raman-active oscillations correspond to previously reported symmetry modes measured with traditional, continuous-wave, Raman spectroscopy using the same scattering geometry. In addition, a polariton mode and other, previously unreported, lower-frequency modes were observed in each of the samples. The transmission intensity data for each sample were fit successfully to a superposition of sinusoidal functions with exponentially decaying amplitudes.

Keywords

Raman spectroscopyabsorptionoptical properties
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 24 , 28 December 2018 , pp. 4207 - 4214
Copyright
Copyright © Materials Research Society 2018 

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