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A tunable, linac based, intense, broad-band THz source forpump-probe experiments

Technical Report ·
DOI:https://doi.org/10.2172/1169458· OSTI ID:1169458
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  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
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We propose an intense THz source with tunable frequency and bandwidth that can directly interact with the degrees of freedom that determine the properties of materials and thus provides a new tool for controlling and directing these ultrafast processes as well as aiding synthesis of new materials with new functional properties. This THz source will broadly impact our understanding of dynamical processes in matter at the atomic-scale and in real time. Established optical pumping schemes using femtosecond visible frequency laser pulses for excitation are extended into the THz frequency regime thereby enabling resonant excitation of bonds in correlated solid state materials (phonon pumping), to drive low energy electronic excitations, to trigger surface chemistry reactions, and to all-optically bias a material with ultrashort electric fields or magnetic fields. A linac-based THz source can supply stand-alone experiments with peak intensities two orders of magnitude stronger than existing laser-based sources, but when coupled with atomic-scale sensitive femtosecond x-ray probes it opens a new frontier in ultrafast science with broad applications to correlated materials, interfacial and liquid phase chemistry, and materials in extreme conditions.
Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
US DOE Office of Science (DOE SC); Basic Energy Sciences (BES)
DOE Contract Number:
AC02-76SF00515;
OSTI ID:
1169458
Report Number(s):
SLAC--R-1049
Country of Publication:
United States
Language:
English

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