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We detect the coherence of localized surface plasmon resonances in individual silver nanoparticles via accurately delayed femtosecond laser pulses. The Fourier transform of the time-resolved spectra reveals nanoplasmonic coherence components and their corresponding dephasing rates.
We compare deviations from theory in the yield of second harmonic generation in order to characterize high-repetition rate femtosecond laser sources where the amplitude and phase differs from pulse to pulse. Experimental results are presented for cases with phase noise and a post-pulse.
We present pump-probe measurements that reveal significant changes in the group delay dispersion of a femtosecond laser pulse being controlled by the relative delay between two pulses. We suggest applications for this time-domain shaping approach.
The optical Kerr effect (OKE) produces an intensity dependent refractive index change which gives rise to self-phase modulation (SPM). SPM leads to changes in laser pulse duration by affecting the phase of the laser pulse. Here we explore the transient behavior of fused silica and find that the OKE-induced phase changes are accompanied by significant changes in the magnitude and sign of the group...
Preparation and probing of coherent superposition of multiple quantum states leading to the generation of quantum coherences in condensed phase systems has been the topic of intense research for over a decade and is one of the most interesting and least understood of the quantum phenomena. Evolution of ultrashort broadband excitation sources has over the years provided us with new tools for revisiting...
A 2 MHz Yb fiber oscillator producing 320 nJ per pulse is developed. The laser is ideal for laser-induced breakdown spectroscopy, due to a low ablation threshold and clean atomic emission spectra.
We demonstrate the measurement of transient dispersion in fused silica by RT-MIIPS. The results are validated via Fourier Transform Spectral Interferometry. The observed dispersion modulation is explained within a theoretical model.
A method capable of measuring single-laser-pulse dispersion is described. It relies on acquiring a single SHG spectrum for a fixed reference phase mask and allows studying transient phase changes in optical media.
A shaped femtosecond laser can selectively excite a coherence in a particular Raman mode. This concept is used to produce chemical images of an explosive simulant in a polymer background in a standoff configuration.
Imaging of a CO2 gas jet in ambient air via single-beam CARS method is demonstrated. This method will be applied to examine reacting flow systems and flames for diagnostic measurements.
We report a new method for standoff chemical detection based on single ultrafast pulse excitation for remote coherent anti-Stokes Raman spectroscopy. Mode-selective and background-free excitations were achieved through optimal binary phase pulse shaping.
We report a method for generation of ultra-broad bandwidth laser spectrum using self-phase modulation in the argon-filled hollow waveguide and pulse compression with multiphoton intrapulse interference phase scan technique.
We present a direct measurement method of the spectral phase of ultrafast laser pulses. The second-derivative of the unknown spectral phase can be directly envisioned and extracted from the experimental 2D-contour plot without mathematical manipulation.
We present a direct measurement method of the spectral phase of ultrafast laser pulses. The second-derivative of the unknown spectral phase can be directly envisioned and extracted from the experimental 2D-contour plot without mathematical manipulation.
We report a method for generation of ultra-broad bandwidth laser spectrum using self-phase modulation in the argon-filled hollow waveguide and pulse compression with multiphoton intrapulse interference phase scan technique.
We report a new method for standoff chemical detection based on single ultrafast pulse excitation for remote coherent anti-Stokes Raman spectroscopy. Mode-selective and background-free excitations were achieved through optimal binary phase pulse shaping.
High-resolution two-photon excitation spectroscopy of natural and synthetic fluorescent biological molecules is demonstrated using an ultra-broad-bandwidth (over 400 nm) femtosecond laser. Selective excitation was achieved using a series of specially designed phase and amplitude masks.
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