University of California

Lawrence Livermore National Security, LLC

Steven T Yang

John Edward Heebner

Jeffrey Devin Bude

Stephan P Velsko

Thomas M Spinka

Raluca A Negres

Maurice B Aufderheide

Craig W Siders

David A Alessi

Scott C Wilks

Otto L Landen

Wade H Williams

Andrew J Mackinnon

Andreas J Kemp

A method for increasing the MeV hot electron yield and secondary radiation produced by short-pulse laser-target interactions with an appropriately high or low atomic number (Z) target. Secondary radiation, such as MeV x-rays, gamma-rays, protons, ions, neutrons, positrons and electromagnetic radiation in the microwave to sub-mm region, can be used, e.g., for the flash radiography of dense objects.

Burst-mode chirped pulse amplification method

This improved Frequency Agile Optical Parametric Oscillator provides near on-axis pumping of a single QPMC with a tilted periodically poled grating to overcome the necessity to find a particular crystal that will permit collinear birefringence in order to obtain a desired tuning range. A tilted grating design and the elongation of the transverse profile of the pump beam in the angle tuning plane of the FA-OPO reduces the rate of change of the overlap between the pumped volume in the crystal and the resonated and non-resonated wave mode volumes as the pump beam angle is changed. A folded mirror set relays the pivot point for beam steering from a beam deflector to the center of the FA-OPO crystal. This reduces the footprint of the device by as much as a factor of two over that obtained when using the refractive telescope design.

Compact, flexible, frequency agile parametric wavelength converter

Growing community of inventors

Danville, CA, United States of America

Steven T Yang