We report on two-photon fluorescence excitation (TPE) action cross sections for five widely
used molecular fluorophores. Measurements were performed by use of ultrashort (∼100-fs) Ti…

We demonstrate efficient single-photon detection at 1.55 µm by means of sum-frequency
mixing with a strong pump at 1.064 µm in periodically poled lithium niobate followed by photon …

We have developed a three-dimensional imaging laser radar featuring 3-cm range resolution
and single-photon sensitivity. This prototype direct-detection laser radar employs compact, …

■ Lincoln Laboratory is developing three-dimensional (3D) imaging laser radars (ladars)
that feature few-centimeter range resolution, thousands of pixels, and capture of an entire 3D …

We demonstrate a new class of frequency-entangled states generated via spontaneous
parametric down-conversion under extended phase-matching conditions. Biphoton …

MIT Lincoln Laboratory is actively developing laser and detector technologies that make it
possible to build a 3D laser radar with several attractive features, including capture of an …

We demonstrate an efficient fiber-coupled source of nondegenerate polarization-entangled
photons at 795 and 1609 nm using bidirectionally pumped parametric down-conversion in …

Once a manager determines a target portfolio, maintaining this balance of assets is non-trivial.
A manager must rebalance actively because different asset classes can exhibit different …

Lincoln Laboratory has developed 32 x 32-pixel ladar focal planes comprising silicon geiger-mode
avalanche photodiodes and high-speed all-digital CMOS timing circuitry in each pixel…

We demonstrate upconversion from 1.56 to 0.633 μm that preserves the polarization state of
an arbitrarily polarized input. The upconverter uses bidirectional sum-frequency generation …