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Accessing the part of the spectrum where semiconductors behave like metals leads to extraordinary transmission in the UV regime and enhanced nonlinear plasmonic phenomena in the UV and soft X-ray wavelengths.
We introduce and test a simple approach for the characterization of domain distribution in bulk quadratic ferroelectric crystals, such as periodically poled Lithium Tantalate with random mark-to space ratio.
Opto-fluidic technique demonstrated non-destructive characterization of nonlinear optical waveguide by modifying effective index of optical mode. Nonuniformity of phase matching wavelength, degradation factor of NLO performance, is revealed in a waveguide wavelength converter.
We report the first continuous-wave optical-parametric-oscillator pumped externally by an optically-pumped-semiconductor-laser. The device provides >2W of frequency-stable output (>60 MHz over 60 seconds) at 48.7% extraction efficiency in TEM00 spatial beam tunable over 873–1360 nm.
We generate 800-nm, sub-7-fs pulses from a degenerate Optical Parametric Amplifier pumped by the second harmonic of a Ti:sapphire system and seeded by supercontinuum generated by a near IR OPA pumped by the same source.
Thermal dephasing due to two-photon absorption-induced linear absorption is reduced by minimizing second- and fourth-harmonic beam overlap through tight elliptical focusing perpendicular to the walk-off plane, leading to multi-watt, high-repetition rate ultraviolet generation in BBO.
We demonstrate residual dispersion and OSNR monitoring from 40Gb/s to 640Gb/s via slow-light enhanced optical THG in dispersion engineered 2D silicon photonic crystal waveguides.
We propose a new probe of surface chirality based on second-harmonic generation and focused circularly-polarized light. We show experimentally that the technique is sensitive only to chirality but not to anisotropy of the sample.
Second and Third harmonic imaging were investigated to observe a corneal flap created by an ophthalmic knife or a microkeratome as it can be processed during a LASIK surgery.
Type I phase matching is demonstrated in an ultrafast laser inscribed BiB3O6 optical waveguide. A novel technique was implemented to achieve good spatial overlap of the horizontally and vertically polarized modes in “strain-field” type waveguides.
A 100-fs Cr:ZnSe laser, based on a ceramic active medium, generates 100 mW at 215 MHz repetition rate around 2450 nm. Co-propagating second-harmonic pulse at 1225 nm is simultaneously generated due to random quasi-phase-matching process.
We theoretically and experimentally demonstrated that direct backward third harmonic generation (THG) waves can be comparable in magnitude with forward THG waves in nanostructures, such as ZnO thin films and nanoparticles of CdSe and Fe3O4.
We report on a femtosecond-OPO based multimodal nonlinear optical microscope that permits multiphoton fluorescence, SHG, THG, CARS, and stimulated Raman scattering imaging on the same platform.
We have observed periodical frequency modulation of high-order harmonics by changing the delay between the driving two-color laser fields, for the first time. The amplitude of the modulation has been up to ∼0.4 eV.
Frequency doubling of high-energy Nd-doped laser emission yields harmonically converted laser energy (532-nm) of 1.2-J with 60 % conversion efficiency using a high optical quality top-seeded solution growth CsB3O5 crystal.
Green picosecond pulses with peak powers of more than 4W are generated by second harmonic generation in bulk PPLN. These power levels exceed all previous electrically triggerable green picosecond sources by an order of magnitude.
We report on high-order harmonic generation from bulk zinc-oxide driven by a strong mid-infrared laser pulse. The harmonic spectra extend well above the band-gap and scales non-perturbatively with the laser intensity.
PPMgSLT is used for mode-locking of a diode-pumped Nd:GdVO4 laser by intracavity SHG. Stable and self-starting operation is observed achieving output powers of up to 4.7 W and pulse durations as short as 3.2 ps.
Using a generalized version of double optical gating, we produced single isolated attosecond pulses with 2 mJ, 25 fs driving lasers. Through attosecond streaking, we characterized isolated 160 attosecond pulses with 170 pJ pulse energy.
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