Neumayer Paul, Sorce Charles, Froula Dustin H, Divol Laurent, Rekow Vern, Loughman Kevin, Knight Russel, Glenzer Siegfried H, Bahr Raymond, Seka Wolf
Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
Rev Sci Instrum. 2008 Oct;79(10):10F548. doi: 10.1063/1.2953413.
A calibration system has been developed that allows a direct determination of the sensitivity of the laser backscatter diagnostics at the Omega laser. A motorized mirror at the target location redirects individual pulses of a millijoule-class laser onto the diagnostic to allow the in situ measurement of the local point response of the backscatter diagnostics. Featuring dual wavelength capability at the second and third harmonics of the Nd:YAG laser, both spectral channels of the backscatter diagnostics can be directly calibrated. In addition, channel cross-talk and polarization sensitivity can be determined. The calibration system has been employed repeatedly over the last two years and has enabled precise backscatter measurements of both stimulated Brillouin scattering and stimulated Raman scattering in gas-filled Hohlraum targets that emulate conditions relevant to those in inertial confinement fusion targets.
已经开发出一种校准系统，可直接测定欧米茄激光器上激光背散射诊断的灵敏度。目标位置的电动镜将毫焦耳级激光器的单个脉冲重定向到诊断设备上，以便对背散射诊断的局部点响应进行原位测量。该系统具有钕钇铝石榴石（Nd:YAG）激光器二次谐波和三次谐波的双波长能力，可直接校准背散射诊断的两个光谱通道。此外，还能确定通道串扰和偏振灵敏度。在过去两年中，该校准系统已被反复使用，能够对充气黑腔靶中的受激布里渊散射和受激拉曼散射进行精确的背散射测量，这些靶模拟了与惯性约束聚变靶相关的条件。
