Enhanced intrapulse difference frequency generation in the mid-infrared by a spectrally dependent polarization state

in: Optics Letters (2022)
Bournet, Q.; Guichard, F.; Natile, M.; Zaouter, Y.; Joffre, M.; Bonvalet, A.; Pupeza, Ioachim; Hofer, Christina; Druon, F.; Hanna, M.; Georges, P.
We present a technique to optimize the intrapulse difference frequency generation efficiency for mid-infrared generation. The approach employs a multi-order wave plate that is designed to selectively rotate the polarization state of the incoming spectral components on the relevant orthogonal axes for subsequent nonlinear interaction. We demonstrate a significant increase of the mid-infrared average power generated, of a factor ≥2.5 compared with the conventional scheme, owing to an optimally distributed number of photons enrolled in the difference frequency generation process.

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