Kavli Affiliate: Alireza Marandi
| First 5 Authors: Arkadev Roy, Luis Ledezma, Luis Costa, Robert Gray, Ryoto Sekine
| Summary:
Optical frequency comb is an enabling technology for a multitude of
applications from metrology to ranging and communications. The tremendous
progress in sources of optical frequency combs has mostly been centered around
the near-infrared spectral region while many applications demand sources in the
visible and mid-infrared, which have so far been challenging to achieve,
especially in nanophotonics. Here, we report frequency combs tunable from
visible to mid-infrared on a single chip based on ultra-widely tunable optical
parametric oscillators in lithium niobate nanophotonics. Using picosecond-long
pump pulses around 1 $mu$m and tuning of the quasi-phase matching, we show
sub-picosecond frequency combs tunable beyond an octave extending from 1.5
$mu$m up to 3.3 $mu$m with femtojoule-level thresholds. We utilize the
up-conversion of the infrared combs to generate visible frequency combs
reaching 620 nm on the same chip. The ultra-broadband tunability and
visible-to-mid-infrared spectral coverage of our nanophotonic source can be
combined with an on-chip picosecond source as its pump, as well as pulse
shortening and spectral broadening mechanisms at its output, all of which are
readily available in lithium niobate nanophotonics. Our results highlight a
practical and universal path for the realization of efficient frequency comb
sources in nanophotonics overcoming their spectral sparsity.
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