Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 9: Photonics II
Q 9.4: Vortrag
Montag, 29. Februar 2016, 15:15–15:30, f342
Theoretical description of all-optically induced, transient long period gratings — •Tim Hellwig, Kai Sparenberg, and Carsten Fallnich — Institute of Applied Physics, University of Münster, Corrensstrasse 2, 48149 Münster, Germany
A theoretical model is developed for transverse mode conversion at all-optical long-period gratings1 transiently induced via multimode interference of a control beam and the optical Kerr-effect. An analytic expression for the resulting directed energy exchange of two transverse probe beam modes is derived in a material representation, in analogy to coupled mode theory, as well as in a four-wave mixing representation. The developed continuous-wave model gives insight into the all-optical mode conversion process and shows excellent agreement to existing numerical simulations. Even for pulsed probe and control beams very good agreement to a corresponding numerical simulation2 is found, when the occurring group-walk offs are negligible in comparison to the conversion length of the process.
1 Hellwig T, et al., Opt. Express 22, 24951 (2014).
2 Hellwig T, et al., Opt. Express 23, 19189 (2015).