University of Rochester

US Government As Represented by the Secretary of the Army

Mark D Skeldon

Robert W Boyd

Samuel A Letzring

Paul Narum

Temporally shaped electrical waveform generation provides electrical waveforms suitable for driving an electro-optic modulator (EOM) which produces temporally shaped optical laser pulses for inertial confinement fusion (ICF) research. The temporally shaped electrical waveform generation is carried out with aperture coupled transmission lines having an input transmission line and an aperture coupled output transmission line, along which input and output pulses propagate in opposite directions. The output electrical waveforms are shaped principally due to the selection of coupling aperture width, in a direction transverse to the lines, which varies along the length of the line. Specific electrical waveforms, which may be high voltage (up to kilovolt range), are produced and applied to the EOM to produce specifically shaped optical laser pulses.

Pulse shaping system

Method and apparatus for optical phase conjugation, which apparatus is also known as a phase conjugate mirror, utilizes Brillouin enhanced four wave mixing in which a forward going pump wave and a backward going pump wave have frequencis which differ by twice the Brillouin frequency of the medium. The probe wave and the conjugate wave, which is obtained by Brillouin enhanced four wave mixing in the medium, have the same frequency, which differs from the pump wave frequencies by the Brillouin frequency of the four wave mixing medium. High reflectivity (gain) is obtained as a result of Brillouin resonance enhancement. The backward going pump wave is created from the forward going pump wave which is transmitted through the four wave mixing medium by stimulated Brillouin scattering in a Brillouin scattering medium having a Brillouin frequency twice that of the four wave mixing medium. The two pump waves are therefore phase conjugates of each other and the quality of the phase conjugation process is not degraded even by the use of an aberrated pump wave.

Method and apparatus for non-frequency-shifted, phase conjugation of

In order to test a laser rod for inclusions, which the usual interferometer oes not test, one of the interferometer mirrors is placed on a lens such that light scattered from inclusions in the rod passes through the lens to a detector.

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Rochester, NY, United States of America

Mark D Skeldon