Abstract
Bulk second-harmonic generation (SHG) inside glass slides is directly detected unambiguously without interference from surface contributions. This is enabled by tightly focused and highly localized ultrashort laser pulses. The theoretical calculations based on vector diffraction theory and the phenomenological model of SHG inside centrosymmetric materials agree well with the measured far-field SHG radiation patterns for different polarization states of the fundamental beam. The results indicate that the observed bulk SHG is predominantly related to the bulk parameter and originates from the three-dimensional field gradient in the focal region.
- Received 24 August 2015
- Revised 29 March 2016
DOI:https://doi.org/10.1103/PhysRevB.93.161109
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