Abstract
We investigated the possibility of making ever-shorter optical pulses by using the nonlinearity of ambient air. We produced a broad spectrum consisting of mutually coherent optical sidebands via collinear Raman generation driven by two picosecond laser pulses that are Raman-resonant with molecular vibrations of nitrogen. We demonstrated the ability to adjust the sideband phases via dispersion control which we accomplished by changing the optical path length of the generated multi-color beam through a pair of tilted glass plates. The resultant measured phases suggest the generation of a 3-fs optical pulse train.
Highlights
Broadband pulse light sources, such as a Ti:Sapphire laser and other femtosecond laser systems, enable a range of important applications, such as nonlinear and time-resolved spectroscopic studies of molecular dynamics and chemical reactions [1,2,3,4], coherent anti-Stokes Raman scattering spectroscopy [5], and even laser annealing [6]
We calculated the temporal waveforms for six points: (A), (B), (C), (D), (E) and (F), shown in
We investigated an approach for generating multiple sidebands and estimated the relative phase and the generated temporal waveform using coherent Raman generation in
Summary
Broadband pulse light sources, such as a Ti:Sapphire laser and other femtosecond (fs) laser systems, enable a range of important applications, such as nonlinear and time-resolved spectroscopic studies of molecular dynamics and chemical reactions [1,2,3,4], coherent anti-Stokes Raman scattering spectroscopy [5], and even laser annealing [6]. Several demonstrations of the ultrabroadband light source have been reported, i.e., the generation of more than 40 emission lines with a picosecond laser in hydrogen gas [14] and more than one-octave spanning spectrum of carrier-envelope controlled Raman sidebands [15]. Such multi-emissions can be employed as an ultrabroadband laser system, and as a source of ultrashort optical pulses if the phases of the multiple molecular modulation sidebands can be properly controlled. The resultant temporal waveform can be measured by, for example, cross-correlation signals in Xe gas [18]
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