Calibration of Mo/Si Multilayer Beam-splitter for Soft X-Ray Laser Beamline

We have developed the soft x-ray laser irradiation beamline for surface processing and damage studies. The beamline is equipped with an intensity monitor, which provides the laser intensity directed onto the sample surface. To derive the irradiation energy from the energy acquired by the intensity monitor, we have evaluated the characteristic features of the Mo/Si multilayer beam-splitter, and then estimated the relationship between the irradiation and detection energies. The maximum fluence is high enough to create ablation (damage) structures on materials

CRYOGENICALLY COOLED 1J, PS YB:YAG SLAB LASER FOR HIGH- BRIGHTNESS LASER-COMPTON X-RAY SOURCE*

Abstract A prototype solid state picosecond laser is reported for single shot laser-Compton bio-imaging applications. The target specification is 1J, 1ps at 120Hz with good beam quality for precise pointing to 10 m focused 43MeV electron beam with 1nC charge. 0.1J stretched pulse is obtained from a thin disc Yb:YAG laser, and amplified through a cryogenically cooled Slab Yb:YAG module in a multipass configuration. Temperature dependent gain characteristics is analysed and concluded as the designed optimization is sufficient for long time stable operation for the laser-Compton imaging

EUV laser irradiation system with intensity monitor

In presentation, we report on development of an extreme ultraviolet (EUV) laser irradiation system at QST. EUV laser has a wavelength of 13.9 nm, and this laser wavelength is close to the wavelength of EUV lithography (λ = 13.5 nm). The irradiation system has an intensity monitor based on the Mo/Si multilayer beam splitter. This intensity monitor provides the irradiation energy onto sample surface. So it is possible to examine and confirm damage/ablation thresholds of optical elements and doses for sensitivity of resist materials, which have the same specifications of those in the EUV lithography.16th International Conference on X-Ray Lasers (ICXRL 2018

Csp³–Csp³ Homocoupling Reaction of Benzyl Halides Catalyzed by Rhodium

A highly reactive alkylrhodium complex was formed from Me₂Zn and RhCl­(PPh₃)₃ and effectively catalyzed a Csp³–Csp³ homocoupling reaction of benzyl halides. A Csp³–Csp³ coupling reaction using Rh catalyst has not been reported up to now. The reaction proceeded under very mild conditions and gave the corresponding homocoupling products even if they had reactive substituents such as an uncovered formyl or hydroxymethyl group

Soft x-ray laser beamline for surface processing and damage studies

We have developed a soft x-ray laser (SXRL) beamline equipped with an intensity monitor dedicated to the ablation study such as surface processing and damage formation. To get the correct irradiation energy/fluence, an intensity monitor composed of a Mo/Si multilayer beam splitter and an x-ray charge-coupled device camera has been installed in the beamline. Mo/Si multilayer beam splitter has a large polarization dependence in the reflectivity around the incident angle of 45 deg. However, by evaluating the relationship between reflectivity and transmittance of the beam splitter appropriately, the irradiation energy onto the sample surface can be derived from the energy acquired by the intensity monitor. This SXRL beamline is available to not only the ablation phenomena but also the performance evaluation of soft x-ray optics and resists