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Multi-frequency Raman Generation with Chirped Pumping

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Abstract

Multi-frequency Raman Generation (MRG) is a promising technique to generate single femtosecond pulses with sufficient energy to carry out nonlinear optics experiments.[1] In this technique, two intense pulses having a frequency separation that corresponds to a Raman transition strongly drive the transition creating a number of Stokes and anti-Stokes orders through a cascaded stimulated Raman process. To date, using MRG pulse trains of 1.6 fs pulses have been achieved in the long pulse, adiabatic regime [2]. The adiabatic regime has the disadvantage of producing a very long train of pulses and so each individual pulse has a correspondingly low intensity. The temporal length of the pulse train corresponds to the inverse of the spectral width of the driving pulses and so the pulse intensity could be greatly enhanced by pumping with two short pulses. Short pulse pumping unfortunately leads to the competing nonlinear effect of self-phase modulation. To avoid self-phase modulation, transient MRG uses broadband pump pulses that are linearly chirped to longer pulse durations. [3,4] Pumping this way leads to each Raman order also being chirped. To achieve transform limited pulse duration in the transient regime, each order will then need to be optimally compressed before phasing all the orders together. The goal of our research is to achieve a large number of Raman orders, which are each spectrally broad with a well-determined spectral phase.

© 2013 Japan Society of Applied Physics, Optical Society of America

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