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We demonstrate a pump-probe phase-contrast method that reconstructs the spatio-temporal profile of plasma structures at density as low as 1016 cm−3. The method is compatible with very thin, very long, even turbulent media.
Functional metamaterials provide useful properties for the design of electromagnetic devices. In this work we demonstrate that functions including high nonlinearity and amplification can be included in metamaterials to realize time reversal imaging.
Examples of synthetic aperture ladar (SAL) imaging utilizing an ultra-broadband actively stabilized chirp source are presented. Demonstrations include high definition strip-map, spotlight, and bistatic mode SAL imaging and interferometric SAL for 3D surface relief imaging.
We present work looking at the two-photon optical characterization of water soluble chemical probes based on surfactant nanomicelles encapsulation and ormosil PEBBLEs as well as in-vitro two-photon imaging of oxygen and hydrogen sulfide.
We achieve in situ, micron-scale tracking of laser machining through a galvo-telecentric beam delivery system using coherent imaging. We collect both high speed intrapulse and interpulse morphology changes as well as overall sweep-to-sweep depth penetration.
Unexpected dispersion of the TEM mode in tapered parallel plate waveguides is investigated experimentally and numerically. The TE02 mode that adiabatically converts into the TEM mode interferes with the genuine TEM and explains this behavior.
We realize a 2D Maxwell's fish eye lens using waveguide-based inhomogeneous artificial dielectrics. The lens images a source at the perimeter to a diametrically opposite location, regardless of the direction of the input illumination.
A new diffractive imaging technique named Imaging By Integrating Stitched Spectrograms (IBISS) is presented. The technique is successfully demonstrated using a Helium Neon laser to image a 350-μm wide sample with 12μm resolution.
We review our recent work on computational on-chip imaging and its applications to telemedicine and high-throughput microscopy, including wide-field imaging of individual viruses on a chip.
A spectrally broadened and compressed fraction of the 30 fs JETI-pulses is utilized for imaging the laser-plasma interaction with 6 fs time resolution. In case of LWFA the direct visualization of the plasma wave became possible.
We employ near-infrared femtosecond pulses to probe local alterations of chromatin dynamics caused by DNA strand breaks. Nonlinear confocal nanomanipulation enables us to visualize how DNA damage signaling emanates spatio-temporally in a live cell.
We demonstrate a high-throughput fluorescent on-chip imaging platform, using structured illumination that can rapidly screen large volumes of scattering media such as undiluted whole blood samples (e.g., ∼ 0.3–0.7 mL) for detection of fluorescent micro-objects at low concentrations (e.g., ≤ 50–100 particles/mL). This imaging modality might especially be useful for rare cell applications involving...
We present an analysis method for the phase retrieval of ultrashort, spatiotemporal pulses. We combine the FROG concept with an imaging cross correlator and reach sub 10 fs temporal and sub 5 micron spatial resolution.
We demonstrate an experiment of imaging through strongly scattering layers based on period diffraction correlation imaging. The implementation of this experiment is quite simple. This technique could find applications in imaging biological tissues.
We use compressive sensing to efficiently image spatial correlations from spontaneous parametric downconversion at high resolution and witness entanglement. This technique efficiently scales to large dimensions and efficiently handles very low flux signals.
We demonstrate 1 photon-per-pixel photon efficiency and sub-pulse-width range resolution in megapixel laser range imaging by using a joint spatio-temporal statistical processing framework and by exploiting transform-domain sparsity.
Recent design of large-mode-area leakage channel fiber is measured with low-attenuation and bend-induced single-mode propagation between 1 μm and 2 μm. We demonstrate remarkable low-loss, diffraction-limited output at 2 um for coiling radii <30 cm.
We demonstrate photonic lattices with segmentation-based linear self imaging as integrated optical limiters. The diffractive propagation between input and output port offers the additional benefit of substantially decreased nonlinear spectral distortions.
We use keyhole coherent diffraction imaging to gain ∼20x increase in flux and fully characterize the illumination, allowing us to image a semi-transparent sample in amplitude and phase. This capability is important for x-ray microscopes.
A novel technique for beam quality improvement of a broad-area diode array has been demonstrated. For each emitter, the fast-axis mode is imaged back onto the slow axis, improving beam quality while preserving slope efficiency.
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