Abstract
A two-color pump beam (800 and 1200 nm) was introduced into hydrogen for molecular phase modulation, and a probe beam (267 nm) to generate Raman sidebands, by coherent frequency modulation based on four-wave Raman mixing. The phase and temporal profile were evaluated by means of a self-diffraction frequency resolved optical gating (SD FROG) system. The relative phases among the Raman sidebands were controlled by changing the angle of a thin CaF2-plate inserted into the 267-nm beam path, suggesting that a train of 2.6-fs pulses was generated in the deep-ultraviolet region.
Highlights
Ultrashort optical pulses have been successfully used in a variety of fundamental studies related to ultrafast phenomena
From the fringe patterns observed in the frequency resolved optical gating (FROG) trace, we verified that the Raman sidebands were phase locked, and confirmed the generation of ultrashort optical pulses
The pulse pulse width in in the the train, Raman sidebands were generated as the result of the molecular phase modulation of hydrogen by the which was by aahalf width atathalf maximum (HWHM), ca.ca
Summary
Ultrashort optical pulses have been successfully used in a variety of fundamental studies related to ultrafast phenomena. It is possible to generate a supercontinuum in a very wide spectral domain using a gas-filled photonic crystal fibers [13,14] Another approach is the generation of multiple sidebands based on four-wave. From the fringe patterns observed in the FROG trace, we verified that the Raman sidebands were phase locked, and confirmed the generation of ultrashort optical pulses. This proof-of-principle experiment points to the potential advantage of four-wave Raman mixing to be used for the generation of an ultrashort optical pulse, and for applications to practical spectrometric studies [1]
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