Design and Operation of Cross Polarization Wave Generation in a Double Crystal Setup for Seeding a 100 TW Laser System*

We present a compact and energy-efficient setup for femtosecond pulse cleaning, utilizing a double crystal arrangement to generate highly efficient cross-polarization wave (XPW) pulses. By employing 1.4 mJ, 35 fs input pulses, we achieve the production of a 150 µJ, 30 fs XPW pulse with a contrast ratio 10^7 at kHz repetition rate. To maintain stability and prevent white light generation, we ensure the internal efficiencies of XPW generation are approximately 12%. This poster outlines the design parameters, layout configuration, and measurements conducted for assessing contrast ratio, pulse duration, and spectral width. Moreover, we present and discuss the results of implementing XPW in the BELLA Hundred TW laser system, specifically focusing on applications in laser-plasma acceleration (LPA) and Thomson scattering generation. The utilization of XPW in these systems demonstrates its potential for enhancing the performance of the advanced LPA beams. The findings of this study contribute to the understanding and optimization of XPW generation, providing valuable insights for the design and operation of highly efficient XPW generation in laser systems. The compact nature and energy efficiency of our setup make it a promising candidate for various applications that require precise spatial and temporal filtering of femtosecond pulses.