Coherent generation of tunable, narrow-band THz radiation by optical rectification of femtosecond pulse trains

Messner, C.; Sailer, Marc; Kostner, H.; Höpfel, R. A.

doi:10.1007/s003400050224

Cited by 12 publications

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“…7) Another method (method 3) produces an optical pulse train from a single optical pulse by using zone plates consisting of several glass slides equally shifted with each other. 8) Here, our main concern is pulsed THz waves. Although the oscillation is continuous-wave (CW), tunable THz waves are generated, for example, by exciting a PC antenna with two CW lasers which operate at different wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Tunable Terahertz Electromagnetic Wave Generation Using Birefringent Crystal and Grating Pair

Yano

Gotoh

2005

Jpn. J. Appl. Phys.

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PACS. 05.50.+q -Lattice theory and statistics (Ising, Potts, etc.). PACS. 75.10.-b -General theory and models of magnetic ordering. PACS. 47.32.Cc -Vortex dynamics.Abstract. -Vortex flow in driven type-II superconductors shows strong memory-and historydependent effects. Here, we study a schematic microscopic model of driven vortices to propose a scenario for a broad set of this kind of phenomena ranging from rejuvenation and stiffening of the system response, to memory and irreversibility in I-V characteristics.An important discovery in the dynamics of vortices driven by an external current in type-II superconductors is the presence of strong "memory"-and history-dependent effects in vortex flow (see, for instance, [1-6] and references therein). These off-equilibrium phenomena, particularly important at low temperatures, crucially affect the overall system behaviour and, thus, have also important consequences for technological applications. Here we present a microscopic model to describe their origin and their connections with other "aging" phenomena of vortex matter such as the rearrangement of vortex domains during creep. In relation to recent experimental results [4,5], we discuss in particular the nature of "memory" effects observed in the response of the system to an external drive, the I-V characteristic and critical currents. We identify the properties of the (off-equilibrium) dynamics of vortex flow at finite T and its relevant time scales. Finally, we stress the similarities and the important differences with other "glassy" systems, such as supercooled liquids or disordered magnets [7,8].We consider a statistical mechanics schematic model introduced to describe the anomalous relaxation of vortices in superconductors, namely a system of repulsive particles diffusing, subject to a Monte Carlo dynamics, in a pinning landscape in the presence of an external drive. The model describes several phenomena of vortex physics, ranging from a re-entrant phase diagram in the (B, T ) plane, to the "anomalous second peak" in magnetisation loops (the "fishtail" effects), glassiness and "aging" of slow magnetic relaxation, the "anomalous creep" at very low temperatures, and many others [9].A system of straight parallel vortex lines, corresponding to a magnetic field B along the z-axis, interacts via a potential which has a natural screening length: the field penetration length λ [1]. The typical high vortex densities and large λ imply that the vortex system c EDP Sciences

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Section: Introductionmentioning

confidence: 99%

Tunable Terahertz Electromagnetic Wave Generation Using Birefringent Crystal and Grating Pair

Yano

Gotoh

2005

Jpn. J. Appl. Phys.

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“…control over the = intra-burst frequency) directly in the time domain would enable very attractive types of vibrational and rotational Raman spectroscopies based on a fixed laser spectrum and single beam geometries. Another very promising application field is generation of tunable THz pulses via laser pulse burst rectification [5].…”

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Direct time-domain shaping of high-energy femtosecond pulses at THz burst frequencies

et al. 2019

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We generate fully controllable fs multimillijoule pulse bursts with the energy handling, throughput efficiency and frequency resolution substantially exceeding that achievable in spatial-light-modulator and interferometric techniques. The demonstrated proof-of-concept experiments include coherent control of nitrogen-ion emission via multiple-pulse excitation and generation of tunable narrowband THz pulses via optical rectification.

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“…The second beam was used to generate the THz probe pulses by optical rectification of femtosecond laser pulses in the highly nonlinear organic crystal 4-dimethylamino-Nmethyl-4-stilbazolium tosylate 7 with an average power of ϳ100 nW. 8 Because the conversion efficiency is proportional to the peak intensity of the laser pulses, an external prism stage was used to precompensate for the groupvelocity dispersion induced by optical components in the beam path, particularly by the nonlinear crystal. Therefore the duration of the pump pulse in the second beam path broadened to ϳ150 fs.…”

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confidence: 99%

“…The spectrum of the generated THz radiation was centered at 3 THz and had a width of ϳ3 THz. 8 The emitted THz pulses were collected and focused with two off-axis parabolic mirrors onto the InP sample, and the transmitted THz radiation was detected with a liquid-He-cooled photoconductive Ge:Ga detector. The time-dependent THz transmission was measured by delaying the optical pump pulse with respect to the THz probe pulse.…”

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Time-resolved THz spectroscopy of proton-bombarded InP

et al. 2001

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We investigate the recombination dynamics of photoexcited carriers in proton-bombarded InP crystals using near-infrared pump-THz-probe spectroscopy. The carrier lifetime is directly related to the proton dose and hence to the induced trap density: In weakly damaged samples we observe a saturation of the trap states for high-excitation densities. For highly damaged samples the time-dependent THz transmission can be explained by taking into account an Auger-assisted trapping process.

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Coherent generation of tunable, narrow-band THz radiation by optical rectification of femtosecond pulse trains

Cited by 12 publications

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Tunable Terahertz Electromagnetic Wave Generation Using Birefringent Crystal and Grating Pair

Tunable Terahertz Electromagnetic Wave Generation Using Birefringent Crystal and Grating Pair

Direct time-domain shaping of high-energy femtosecond pulses at THz burst frequencies

Time-resolved THz spectroscopy of proton-bombarded InP

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