公开(公告)号：US20200020459A1

公开(公告)日：2020-01-16

申请号：US16510082

申请日：2019-07-12

Applicant: LAWRENCE LIVERMORE NATIONAL SECURITY, LLC

Inventor： Jeffrey D. Bude ,  David A. Alessi ,  Maurice B. Aufderheide ,  John E. Heebner ,  Andreas J. Kemp ,  Otto L. Landen ,  Andrew J. Mackinnon ,  Raluca A. Negres ,  Craig W. Siders ,  Scott C. Wilks ,  Wade H, Williams ,  Steven T. Yang ,  Thomas M. Spinka

IPC: G21K5/02 ,  H01S3/00 ,  H01S3/23

Abstract: 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.

公开(公告)号：US11222734B2

公开(公告)日：2022-01-11

申请号：US16510082

申请日：2019-07-12

Applicant: LAWRENCE LIVERMORE NATIONAL SECURITY, LLC

Inventor： Jeffrey D. Bude ,  David A. Alessi ,  Maurice B. Aufderheide ,  John E. Heebner ,  Andreas J. Kemp ,  Otto L. Landen ,  Andrew J. Mackinnon ,  Raluca A. Negres ,  Craig W. Siders ,  Scott C. Wilks ,  Wade H. Williams ,  Steven T. Yang ,  Thomas M. Spinka

IPC: G21K5/02 ,  H01S3/23 ,  H01S3/00 ,  H01S3/067 ,  H01S3/13 ,  H01S5/00 ,  H01S3/10 ,  H01S5/50

Abstract: 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.

公开(公告)号：US20200076150A1

公开(公告)日：2020-03-05

申请号：US16678063

申请日：2019-11-08

Applicant: Lawrence Livermore National Security, LLC

Inventor： Alvin C. Erlandson ,  Andrew J. Bayramian ,  Constantin L. Haefner ,  Craig W. Siders ,  Thomas C. Galvin ,  Thomas M. Spinka

IPC: H01S3/042 ,  H01S3/22 ,  H01S3/091

Abstract: Techniques are provided for scaling the average power of high-energy solid-state lasers to high values of average output power while maintaining high efficiency. An exemplary technique combines a gas-cooled-slab amplifier architecture with a pattern of amplifier pumping and extraction in which pumping is continuous and in which only a small fraction of the energy stored in the amplifier is extracted on any one pulse. Efficient operation is achieved by propagating many pulses through the amplifier during each period equal to the fluorescence decay time of the gain medium, so that the preponderance of the energy cycled through the upper laser level decays through extraction by the amplified pulses rather than through fluorescence decay.