Kavli Affiliate: Alireza Marandi
| First 5 Authors: Thomas Zacharias, Robert Gray, Ryoto Sekine, James Williams, Selina Zhou
| Summary:
The growth of ultrafast nanophotonic circuits necessitates the development of
energy-efficient on-chip pulse characterization techniques. Nanophotonic
realizations of Frequency Resolved Optical Gating, a common pulse
characterization technique in bulk optics, have been challenging due to their
non-collinear nature and the lack of efficient nonlinear optical processes in
the integrated platform. Here, we experimentally demonstrate a novel FROG-based
technique compatible with the nanophotonic platform that leverages the high
gain-bandwidth of a dispersion-engineered degenerate optical parametric
amplifier for energy-efficient ultrashort pulse characterization. We
demonstrate on-chip pulse characterization of sub-80-fs, ~1-fJ pulses using
just ~60-fJ of gate pulse energy, which is several orders of magnitude lower
than the gate pulse energy required for characterizing similar pulses in the
bulk counterpart. In the future, we anticipate our work will enable the
characterization of ultraweak-ultrashort pulses with energies at the single
photon level.
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