2001

Ultrafast Phase Transition Dynamics in GeSb Alloys, at CLEO/QELS 2001 (Baltimore, MD), Tuesday, May 8, 2001:
We measure the femtosecond time resolved dielectric function of a-GeSb after excitation with an ultrashort laser pulse. The results reveal an ultrafast transition to a new non-thermodynamic phase that is not c-GeSb, as suggested elsewhere.
Two-Photon Absorption FROG: measuring white-light continuum pulses, at Conference on Lasers and Electro-Optics (Baltimore, MD), Monday, May 7, 2001
We demonstrate a new type of frequency resolved optical gating using the two- photon-absorption nonlinearity. The resonant enhancement and lack of phasematching re- quirements enable the FROG measurement of ultrashort white-light continuum laser pulses.
Fabrication of Micrometer-Sized Conical Field Emitters Using Femtosecond Laser-Assisted Etching of Silicon, at MRS Spring Meeting (San Francisco, CA), Friday, April 20, 2001:
We produce quasi-ordered arrays of sharp, conical microstructures by structuring the surface of a silicon wafer using femtosecond laser-assisted etching. Analysis of the arrays shows high, stable field emission without any further processing. The sharp, micrometer-sized conical structures result from irradiation of a silicon surface with hundreds of femtosecond-laser pulses in an atmosphere of SF6. These conical microstructures have sharp tips with a radius of curvature of about 250 nm and a subtended angle of less than 20°. They are 10–14 µm tall, have tip-to-tip separations of 6–10 µm, and... Read more about Fabrication of Micrometer-Sized Conical Field Emitters Using Femtosecond Laser-Assisted Etching of Silicon

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