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Abstract by Nicholas Ellsworth

Personal Infomation

Presenter's Name

Nicholas Ellsworth

Degree Level



Parker Salmans
Masataka Kobayashi
Ikufumi Katayama
Jeremy Johnson

Abstract Infomation


Chemistry and Biochemistry

Faculty Advisor

Jeremy Johnson


Optical Fiber Based Single-shot Ultrafast Spectroscopy


Ultrafast pump-probe spectroscopy can be used to measure phenomena that occurs on the picosecond time scale. Single-shot spectroscopy is a novel technique that can speed up data-acquisition times by several orders of magnitude. In traditional pump-probe measurements, several hundreds to thousands of laser pulses are required to map out a trace. In single-shot measurements the response of the sample to the pump pulse is spectrally encoded onto a stretched probe pulse. This probe pulse is then focused into an optical fiber that acts to stretch the probe pulse from a few ps to the ns timescale. This pulse can then be readout by a fast photodiode onto an oscilloscope. Ideally an entire trace can be recorded with a single pulse from the laser system. A further advantage of single-shot measurements makes possible the recording of irreversible reactions; this can be utilized to study damage thresholds and phase changes in our samples. I will discuss tests of this fiber-based single shot method and compare our results to spectrometer-based measurements.