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The nonlinear light-matter interaction lies at the heart of controlling the electronic systems for the purpose of developing ultrafast optical switching and modulation devices [1], and attosecond laser technology [2]. In general, the interaction causes the formation of photon dressed state that is a quantum superposition state with energetically spaced sidebands and enables to generate the phase-locked...
We measured the transient absorption changes of a near-infrared (NIR) pulse in GaAs quantum well under a multicycle THz wave driving. By changing the delay between the NIR probe and the THz wave, the absorption strength can be modulated on a sub-cycle timescale of THz wave, indicating the formation of THz-induced dressed states of excitons.
Optical constants of 6H-SiC have been measured by using far infrared (FIR) lasers of 48, 57, 71, and 119 μm in wavelength. The refractive index and absorption coefficient at the wavelength have been determined from the transmittance of a rotating SiC etalon. For the application of the SiC to optical elements in the FIR region, it was compared with other materials (crystal quartz, high resistive silicon,...
Recent development of ultrashort pulse technologies allows us to drive large amplitude motion of electron and ion coherently. The intense terahertz (THz) pulse resonant with the vibration frequency is promising to drive vibrations more directly and in coherent manner. In the case of semiconductors, one may coherently control the electronic system in the sub-level structures of quantum structures with...
The excitonic interaction in ZnSe/ZnMgSSe multiple quantum wells with intense terahertz pulses (~70 kV/cm) has been studied. Our results show a dynamical Stark effect on the excitonic absorption with a subpicosecond response time.
Intense monocycle THz pulse can drive large-amplitude vibration mode which gives us a chance to perform novel THz nonlinear spectroscopy. We experimentally demonstrated large amplitude anharmonic intermolecular vibration mode using intense monocycle THz pulse. We performed the nonlinear transmission spectroscopy of the amino acids micro-crystals at different electric field amplitude and observed the...
We experimentally demonstrate terahertz (THz) nonlinear transmission spectroscopy of the amino acids microcrystals using intense mono-cycle THz pulse. Absorptions of intermolecular vibration mode are saturated with incident electric field amplitude. This is due to the rearrangements of population distributed in an anharmonic intermolecular vibration potential. This will open a new THz pump probe spectroscopy...
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