Tabletop time-resolved soft x-ray spectrometer
Technical Report,01 Jul 2018,30 Jun 2019
University of California, San Diego La Jolla United States
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Based on this DURIP grant, we purchased the necessary laser systems and other components optics, vacuum components and optical mechanics, as well as a few customized-designed pieces to construct a table top time-resolved EUV soft x-ray spectrometer. We have successfully constructed a compact, ultrafast UV pump and EUV probe spectrometer, based on a fiber-based high-harmonic generation HHG based EUVSoft X-ray beamline. Using this setup, we have obtained static absorption of -Fe2O3 thin film, reproduced literature reported transient absorption to track electron dynamics and polaron formation at Fe element in -Fe2O3. Recently, we also studied another different form of Fe2O3, which shows electronic dynamics that favors charge recombination. We are currently finalizing this study by characterizing structural difference between the two types of Fe2O3 and understand why one favors polariton formation whereas the other one facilitates charge recombination. In addition, a novel 2D UV-EUV spectroscopy to disentangle heterogeneity in solid state charge dynamics, contributing to my other AFOSR related project.
- Test Facilities, Equipment and Methods