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Analysis and suppression of parasitic processes in noncollinear optical parametric amplifiers

: Bromage, J.; Rothhardt, J.; Hädrich, S.; Dorrer, C.; Jocher, C.; Demmler, S.; Limpert, J.; Tünnermann, A.; Zügel, J.D.

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Optics Express 19 (2011), No.18, pp.16797-16808
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IOF ()

The influence of parasitic processes on the performance of ultra-broadband noncollinear optical parametric amplifiers (NOPA’s) is investigated for walk-off and non-walk-off compensating configurations. Experimental results with a white-light–seeded NOPA agree well with numerical simulations. The same model shows that 10% of the output energy of an amplified signal can be transferred into a parasitic second harmonic of the signal. These findings are supported by quantitative measurements on a few-cycle NOPA, where a few percent of the signal energy is converted to its second harmonic in the walk-off compensating case. This effect is reduced by an order of magnitude in the non-walk-off compensating configuration. A detailed study of the phase-matching conditions of the most common nonlinear crystals provides guidelines for designing NOPA