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HL: Fachverband Halbleiterphysik
HL 59: THz and MIR physics in semiconductors
HL 59.8: Vortrag
Donnerstag, 19. März 2020, 11:45–12:00, POT 151
μJ -level picosecond far-infrared pulses generated via difference frequency mixing in organic DSTMS crystal — •Jiang Li1,3, Rakesh Rana1, Alexej Pashkin1, Manfred Helm1,2, and Harald Schneider1 — 1Institute of Ion Beam Physics and Material Research, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Institute of Applied Physics, Technische Universität Dresden, Dresden, Germany — 3Institute of Fluid Physics, CAEP, Mianyang, Sichuan, China
We report on the generation of narrowband far-infrared pulses with energies up to 3 μJ. The technique relies on difference-frequency generation in the organic nonlinear crystal DSTMS from two linearly chirped near-infrared pulses. The tunability of the difference frequency ranging from 9 to 24 THz is achieved by tuning the frequency of the pump pulses. The measured output power was observed to increase monotonically with frequency. Our simulation based on a 1-D nonlinear wave equation model reproduces this behavior and attributes it mainly to the frequency-dependent far-infrared absorption in DSTMS. As the two near-infrared pulses are derived from the signal outputs of two optical parametric amplifiers pumped by the same Ti: sapphire femtosecond amplifier, the generated THz transient is envelop-phase stable and can be accurately sampled using an electro-optic detection scheme. This THz source provides many attractive possibilities for selective excitation of low-energy transitions or high-harmonic generation in condensed matter.