Abstract
Our group has been developing ultrabroadband coherent infrared spectroscopy system for studying solid state physics. Using hollow fiber compressed sub-20 fs optical pulses and air as nonlinear media, so far we realized the time domain measurement of infrared pulses in the range of 1−150 THz [1]. Also we applied the system to the time-resolved measurements of semiconductors such as silicon and indium antimonide [2,3]. However, we could not obtain an enough signal to noise ratio for components with frequencies above 100 THz. In the present paper, controlling the polarization of two-color pulses for plasma excitation[4,5], we have enhanced the intensity of coherent infrared pulses by at least a few times at the frequency of 150 THz (2 μm).
© 2015 Japan Society of Applied Physics, Optical Society of America
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