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A Monolithic Gimbal Micro-Mirror Fabricated and Remotely Tuned with a Femtosecond Laser

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Investigation of nonlinear absorption processes with femtosecond light pulses in lithium niobate crystals

Demetri Psaltis

The propagation of high-power femtosecond light pulses in lithium niobate crystals (LiNbO3) is investigated experimentally and theoretically in collinear pump-probe transmission experiments. It is found within a wide intensity range that a strong decrease ...

2005

Femtosecond holography

Demetri Psaltis, Ye Pu

We present a holographic recording technique with 150 femtosecond time resolution. This technique allows us to capture either a single hologram with fine spatial resolution (4μm), or a time-sequence of multiple holograms with reduced spatial resolution in ...

2005

Picosecond time-resolved X-ray Absorption Spectroscopy of solvated organometallic complexes

Majed Chergui, Wojciech Gawelda, Melanie Saes

We describe an experimental setup, which measures transient chemical changes of photoexcited solutes in disordered systems via time-resolved X-ray Absorption Spectroscopy (XAS) with picosecond temporal resolution. The setup combines a femtosecond amplified ...

2005

Femtosecond holography in lithium niobate crystals

Demetri Psaltis

Spatial gratings are recorded holographically by two femtosecond pump pulses at 388 nm in lithium niobate (LiNbO3) crystals and read out by a Bragg-matched, temporally delayed probe pulse at 776 nm. We claim, to our knowledge, the first holographic pump-pr ...

2005

Enhanced temporal resolution in femtosecond dynamic-grating experiments

Demetri Psaltis

Recording of gratings by interference of two pump pulses and diffraction of a third probe pulse is useful for investigating ultrafast material phenomena. We demonstrate, in theory and experiment, that the temporal resolution in such configurations does not ...

2005

Dynamics of filament formation in a Kerr medium

Demetri Psaltis, Ye Pu

We have studied the large-scale beam breakup and filamentation of femtosecond pulses in a Kerr medium. We have experimentally monitored the formation of stable light filaments, conical emission, and interactions between filaments. Three major stages lead t ...

2005

Fabrication of high-aspect ratio, micro-fluidic channels and tunnels using femtosecond laser pulses and chemical etching

Yves Bellouard

We present novel results obtained in the fabrication of high-aspect ratio micro-fluidic microstructures chemically etched from fused silica substrates locally exposed to femtosecond laser radiation. A volume sampling method to generate three-dimensional pa ...

Optical Society of America2004

Holographic recording of laser-induced plasma

Demetri Psaltis, Ye Pu

We report on a holographic probing technique that allows for measurement of free-electron distribution with fine spatial detail. Plasma is generated by focusing a femtosecond pulse in air. We also demonstrate the capability of the holographic technique of ...

2004

Ultrafast studies of ferric complexes of hemoglobin I from Lucina pectinata

Majed Chergui

Sample prepn. and ligand complex prepn. of Hb I from Lucina pectinata were performed to obtain ultrafast data on ferric HbI-NO, HbI-N3, HbI-H2S and metHbI complexes that suggest a mechanism for the photoinduced redn. of HbI species. Formation of a transien ...

2004

Reverse propagation of femtosecond pulses in optical fibers

Demetri Psaltis

We present a numerical technique for reversing femtosecond pulse propagation in an optical fiber, such that given any output pulse it is possible to obtain the input pulse shape by numerically undoing all dispersion and nonlinear effects. The technique is ...

2003