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An Opolette HR 355 will be available for <8 ns pump laser pulses over a wide tunability range (410-2200 nm). This laser will be fiber-coupled then propagated in free-space into the sample chamber and combined collinearly with the x-ray, with in-coupling ~250 mm upstream of the sample and with the focusing lens ~350mm away from the sample. Note that the efficiency of the optics and the performance of the laser will not be the same for the entire wavelength range. The maximum achievable power density will be determined by the existing optical system and will not be modified. Contact the CXI scientists to discuss specific needs and determine if they can be achieved using this standard configuration of the laser. The expected performance at the source is shown below (the energy on target will be substantially lower due to transport losses). The CXI system will have the following options:
For the femtosecond laser, the CXI time tool will be available to record single shot arrival times that can be post-sorted. Time zero at the sample can be obtained to better than 200 fs using a CXI-supplied target to measure the index of refraction change induced by the x-ray beam.
Mark Hunter, Sergio Carbajo, Andy Aquila, Alex Batyuk, TJ Lane, Meng Liang, Matt Seaberg, Ray Sierra, Sebastien Boutet
SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy