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Tunable near- to mid-infrared pump terahertz probe spectroscopy in reflection geometry |
S. J. Zhang1, Z. X. Wang1, T. Dong1( ), N. L. Wang1,2() |
1. International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
2. 2Collaborative Innovation Center of Quantum Matter, Beijing 100871, China |
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Abstract Strong-field mid-infrared pump–terahertz (THz) probe spectroscopy has been proven as a powerful tool for light control of different orders in strongly correlated materials. We report the construction of an ultrafast broadband infrared pump–THz probe system in reflection geometry. A two-output optical parametric amplifier is used for generating mid-infrared pulses with GaSe as the nonlinear crystal. The setup is capable of pumping bulk materials at wavelengths ranging from 1.2 m to 15 m and beyond, and detecting the subtle, transient photoinduced changes in the reflected electric field of the THz probe at different temperatures. As a demonstration, we present 15 m pump–THz probe measurements of a bulk EuSbTe3 single crystal. A 0:5% transient change in the reflected THz electric field can be clearly resolved. The widely tuned pumping energy could be used in mode-selective excitation experiments and applied to many strongly correlated electron systems.
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| Keywords
mid-infrared pump
terahertz spectroscopy
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Corresponding Author(s):
T. Dong,N. L. Wang
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Issue Date: 22 September 2017
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