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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.
The nonlinear interactions of GaAs quantum wells with intense single cycle terahertz (THz) pulses with amplitudes exceeding 1 MV/cm have been studied. We demonstrated for the first time that the number of carriers is enhanced 103 times more with an increase of the electric field amplitude of the THz pulse from 0.5 to 1 MV/cm, eventually which leading a bright near-infrared luminescence. This highly...
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...
This paper presents a novel configuration for a robotic waveguide that duplicates an active optical line without disrupting communication services. The robotic waveguide is placed in a detour line, which is coupled with the active line. This duplication enables part of the active line to be replaced with a new line segment. The proposed robotic waveguide is compact and low loss, and it operates quickly...
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...
This paper studies a frame-loss-free shunt system for broadband optical fiber transmission lines. This system switches transmitting optical pulses between duplicated optical fibers to avoid any interruption to communication. A high-resolution measurement technique is necessary to evaluate the optical fiber length. We applied an interferometry technique to adjust 15 km duplicated optical lines at a...
This paper proposes a method for the interferometry path length measurement of dualized optical transmission lines with a precision of 1 mm. The frame-loss-free line switching of in-service GE-PON is realized by continuously transferring signals.
We demonstrate terahertz time-domain attenuated total reflection spectroscopy of various organic powder samples, which is useful for convenient and repeatable characterization of the materials such as biomolecules.
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