Angular feature of conical emission in an isotropic amorphous medium pumped by femtosecond pulses

Abstract

Broadband parametric upconverted conical emission (CE) has been investigated in an isotropic amorphous medium pumped by femtosecond laser pulses, which covers a broad range from 470 to 630 nm. Three theoretical models were analyzed to interpret the angular beam of CE. The CE spectra and their angular positions have been experimentally measured, which can be explained well by nonlinear X-wave model and Cerenkov type phase matching model rather than four-wave mixing (FWM) model.

Keywords

conical emission (CE) / femtosecond laser pulses / four-wave mixing (FWM) / Cerenkov type process / X-wave model

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Acknowledgements

Special thanks to Professor Peixiang Lu for providing the experiment equipments and valuable discussion; without his help, this work would never be finished. This work was supported by the Fundamental Research Funds for the Central Universities (No. CUGL090249).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg