Loa Alamos National Laboratory
Senior Scientist
University of Rochester Aug 2008 - Aug 2015
Deputy Director and Associate Director For R and D, Laboratory For Laser Energetics
Los Alamos National Laboratory Aug 2008 - Aug 2015
Physics Division Leader
Education:
Princeton University 1981 - 1986
Doctorates, Doctor of Philosophy, Physics, Philosophy
Cornell University 1977 - 1981
Bachelors, Bachelor of Arts, Physics
Princeton High School
David D. Meyerhofer - Spencerport NY Ansgar W. Schmid - Honeoye Falls NY Yung-ho Chuang - Rochester NY
Assignee:
The University of Rochester - Rochester NY
International Classification:
H01S 3082
US Classification:
372 23
Abstract:
Ultra short (pico second and shorter) laser pulses having components of different frequency which are overlapped coherently in space and with a predetermined constant relationship in time, are generated and may be used in applications where plural spectrally separate, time-synchronized pulses are needed as in wave-length resolved spectroscopy and spectral pump probe measurements for characterization of materials. A Chirped Pulse Amplifier (CPA), such as a regenerative amplifier, which provides amplified, high intensity pulses at the output thereof which have the same spatial intensity profile, is used to process a series of chirped pulses, each with a different central frequency (the desired frequencies contained in the output pulses). Each series of chirped pulses is obtained from a single chirped pulse by spectral windowing with a mask in a dispersive expansion stage ahead of the laser amplifier. The laser amplifier amplifies the pulses and provides output pulses with like spatial and temporal profiles.
David D. Meyerhofer - Spencerport NY Oleg A. Konoplev - Rochester NY
Assignee:
The United States of America as represented by the United States Department of Energy - Washington DC
International Classification:
H01S 313
US Classification:
372 30
Abstract:
A pulsed laser is provided wherein the B-integral accumulated in the laser pulse is reduced using a semiconductor wafer. A laser pulse is generated by a laser pulse source. The laser pulse passes through a semiconductor wafer that has a negative nonlinear index of refraction. Thus, the laser pulse accumulates a negative B-integral. The laser pulse is then fed into a laser amplification medium, which has a positive nonlinear index of refraction. The laser pulse may make a plurality of passes through the laser amplification medium and accumulate a positive B-integral during a positive non-linear phase change. The semiconductor and laser pulse wavelength are chosen such that the negative B-integral accumulated in the semiconductor wafer substantially cancels the positive B-integral accumulated in the laser amplification medium. There may be additional accumulation of positive B-integral if the laser pulse passes through additional optical mediums such as a lens or glass plates. Thus, the effects of self-phase modulation in the laser pulse are substantially reduced.