Physics – Optics
Scientific paper
2011-12-05
Physics
Optics
5 pages, 4 figures
Scientific paper
We precisely measure the time-energy correlation of broadband, spontaneously generated four waves mixing (FWM), and demonstrate novel time-frequency coupling effects. By pumping a photonic crystal fiber with narrowband picosecond pulses we generate FWM in a unique regime, where extremely broadband (>100nm), sidebands are generated that are incoherent, yet time-energy correlated. Although conceptually similar to parametric down conversion (PDC), the time-energy correlation in FWM is unique in its dependence on pump intensity due to self and cross phase modulation effects, yielding surprising spectral and temporal structure in the correlations. Specifically, a power dependent splitting of the correlation in both energy and time is observed at high power. While these effects are minute compared to the time duration and bandwidth of the FWM sidebands, they are well observed using sum frequency generation as a precise, ultrafast correlation detector. A theoretical model accounts for the results and highlights the differences between FWM and PDC.
Pe'er Avi
Rosenbluh Michael
Vered Rafi
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