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Local field enhancements in metallic nanostructures enable the study of various highly nonlinear optical processes in nanoscopic volumes. In this talk, the prominent examples of strong-field photoemission and extreme ultraviolet light generation will be discussed.
Based on the recirculating frequency shifting structure, a high-speed laser scanner is proposed and experimentally demonstrated, where the scan rate, wavelength resolution and spectral coverage can be conveniently adjusted for various kinds of applications.
We demonstrate high optical-to-THz conversion efficiency of 3.8% by optical rectification in cryogenically-cooled lithium niobate using near-optimum 680 fs, 1.2 mJ pump pulses centered at 1 μm. Spatial and temporal characterization will be presented.
Nonlinear optical studies are carried out on graphene-based polymer composites in the nanosecond and picosecond temporal regime. These graphene-composites demonstrate saturable absorption followed by reverse saturable absorption which depends on graphene content and operation regime.
A significant enhancement of the terahertz generation efficiency via two-color laser-induced air ionization, up to 10−3, is observed with increasing pump wavelength. Terahertz peak fields up to 4.4 MV/cm were obtained using 400 μJ pulse energy.
Strong THz pulses induce pronounced nonlinear optical effects in a QW microcavity, resonantly driving exction-polariton polarizations coupled to an optically dark 2p-exciton polarization. The coherent coupling between the polarizations dephases within a few picoseconds.
Strong THz electric and magnetic fields are harnessed to coherently control charge and spin in solids with sub-cycle resolution. Exploiting coherent THz phonons we transiently induce and destroy spin density wave order in pnictides.
We have experimentally demonstrated a self-starting mode-locked fiber laser source operating at 1503 nm with 9 nm output bandwidth. The mode-locked laser works stably with a pumping threshold of 225 mW at 980 nm.
We demonstrate frequency-resolved optical gating using four-wave mixing in a hydrogenated amorphous silicon nanowaveguide. The ultrahigh nonlinearity and the wide conversion bandwidth of this device allow characterization of sub-ps pulses with high sensitivity.
We present an electro-optic method for single-shot spatio-temporal THz waveform-mapping which avoids distortions associated with spectral encoding and retains the benefits of nonlinear cross-correlation but using linear detection. THz waveforms from laser-plasma accelerator are reconstructed.
A novel technique is introduced to characterize the nonlinear properties of organic dyes in solution. This technique uses the integrated liquid core optical fiber (i-LCOF) platform and is based on the spectral broadening of laser pulses due to self phase modulation (SPM).
We demonstrate the coherent transfer and on-demand retrieval of quantum state of telecom-wavelength ultrabroadband single photon pulse (terahertz range) to a collective excitation of a large number of quantum dots using photon-echo technique. The large inhomogeneous broadening of exciton energies in quantum dots, in conjunction with photon-echo technique, enables us to increase the acceptable spectral...
We propose an unconventional optical trapping mechanism between a strong fundamental soliton and an ultrashort weak dispersive radiation in a hollow-core photonic crystal fiber filled by a noble gas.
We report the first demonstration of time-to-space conversion of sub-picosecond pulses at 1.55μm in a nonlinear slab waveguide using non-degenerate, collinear SFG. A time window of 46ps and serial-to-parallel demultiplexing factor of 93 were achieved.
We simulate multi-shot measurements of trains of pulses with unstable shapes using SPIDER, SRSI, SHG FROG, PG FROG, and XFROG. Interferometric methods measure only the coherent artifact, while FROG methods better approximate the trains.
We demonstrate a fastscan-delay with a precision of 20 as and scan rates exceeding 30 kHz. The fiber-compatible device is based on an acousto-optic programmable dispersive filter and is ideally suited for pump-probe experiments.
The carrier-envelope-offset frequencies of the pump, signal, idler and related sum-frequency mixing pulses have been locked to 0 Hz in a 20-fs-Ti:sapphire-pumped optical parametric oscillator, satisfying a critical prerequisite for broadband optical pulse synthesis.
We show improvement in relative intensity noise (RIN) for a fiber optical parametric oscillator (FOPO) as a function of input power and of wavelength, an attractive alternative to supercontinuum (SC) for nonlinear optical microscopy.
We report on formation of high-pressure polymorphs of Si in confined microexplosion experiments. The results show that Si has undergone pressure-induced transitions into the realm of the metallic phases conventionally formed above 11 GPa.
Radially symmetric Airy optical beams exhibit a focus area that is strongly non-symmetric and abrupt. We use this unique feature to precisely deliver energy in the bulk of fused silica without affecting the preceding material.
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