Coherent heterodyne time-domain spectrometry covering the entire “terahertz gap”

Karpowicz, Nicholas; Dai, Jianming; Lu, Xiaofei; Chen, Yunqing; Yamaguchi, Masashi; Zhao, Hongwei; Zhang, X.-C.; Zhang, Liangliang; Zhang, Cunlin; Price-Gallagher, Matthew; Fletcher, Clark; Mamer, Orval; Lesimple, Alain; Johnson, K. H.

doi:10.1063/1.2828709

Cited by 325 publications

(173 citation statements)

References 15 publications

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“…[62,63] generation of the second-harmonic field by the four-wave mixing process can be used to measure the temporal dependence of the THz electric field. In the detection stage ( Figure 5) both the THz and the probe beam with frequency ω are focused between two needle or plate shaped electrodes having a small separation of the order of 1 mm [63]. The intensity is kept just below the plasma formation threshold.…”

Section: 3detection Of Thz Waves In Gasesmentioning

confidence: 99%

Intense ultrashort terahertz pulses: generation and applications

Hoffmann¹,

Fülöp²

2011

J. Phys. D: Appl. Phys.

332

215

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Ultrashort terahertz pulses derived from femtosecond table-top sources have become a valuable tool for time-resolved spectroscopy during the last two decades. Until recently, the pulse energies and field strengths of these pulses have been generally too low to allow for the use as pump pulses or the study of nonlinear effects in the terahertz range. In this review article we will describe methods of generation of intense single cycle terahertz pulses with emphasis on optical rectification using the tilted-pulse-front pumping technique. We will also discuss some applications of these intense pulses in the emerging field of nonlinear terahertz spectroscopy.

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Section: 3detection Of Thz Waves In Gasesmentioning

confidence: 99%

Intense ultrashort terahertz pulses: generation and applications

Hoffmann¹,

Fülöp²

2011

J. Phys. D: Appl. Phys.

332

215

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“…Electro-optic sampling [42] is effective to detect low frequency components (<1000 cm −1 ). We performed an air-biased coherent detection scheme [43] for the electro-optic sampling. The schematic of the system is shown in Figure 1(b).…”

Section: Electro-optic Samplingmentioning

confidence: 99%

Generation of Phase-Stable Sub-Cycle Mid-Infrared Pulses from Filamentation in Nitrogen

Fuji

Nomura

2013

Applied Sciences

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Sub-single-cycle pulses in the mid-infrared (MIR) region were generated through a laser-induced filament. The fundamental (ω 1 ) and second harmonic (ω 2 ) output of a 30-fs Ti:sapphire amplifier were focused into nitrogen gas and produce phase-stable broadband MIR pulses (ω 0 ) by using a four-wave mixing process (ω 1 + ω 1 − ω 2 → ω 0 ) through filamentation. The spectrum spread from 400 cm −1 to 5500 cm −1 , which completely covered the MIR region. The low frequency components were detected by using an electro-optic sampling technique with a gaseous medium. The efficiency of the MIR pulse generation was very sensitive to the delay between the fundamental and second harmonic pulses. It was revealed that the delay dependence of the efficiency came from the interference between two opposite parametric processes, ω 1 + ω 1 − ω 2 → ω 0 and ω 2 − ω 1 − ω 1 → ω 0 . The pulse duration was measured as 6.9 fs with cross-correlation frequency-resolved optical gating by using four-wave mixing in nitrogen. The carrier-envelope phase of the MIR pulse was passively stabilized. The instability was estimated as 154 mrad rms in 2.5 h.

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“…A THz wave having a peak intensity of the order of hundreds of kV/cm has recently been demonstrated using a pulsed laser [3,4]. It has been found that the irradiation of a periodically oscillating THz wave causes photon-mediated tunneling in quantum wells (QWs), superlattices (SLs), and Wannier-Stark ladders (WSLs).…”

Section: Introductionmentioning

confidence: 99%

“…However, as F ac is enhanced to the intense region of the order of hundreds of kV/cm, it can be hypothesized that a large number of PSBs contribute to this coupling, invalidating the conventional interpretation mentioned above. Further, state-of-the-art THz light sources that can realize such intensities have already been produced [3,4], as mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Instability of dynamic localization in the intense terahertz-driven semiconductor Wannier-Stark ladder due to the dynamic Fano resonance

et al. 2010

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The lifetime of an electronic Floquet state in a semiconductor Wannier-Stark ladder (WSL) driven by an intense monochromatic THz wave is examined based on the R-matrix Floquet theory, in which an excess density of state (DOS) corresponding to the lifetime is calculated. It is revealed that the dynamic localization (DL) characteristic of this system is unstable against Fano resonance (FR)-like inter-miniband decay mechanism caused by THz-mediated ac-Zener tunneling; in this study, this is termed as dynamic Fano resonance (DFR). The DFR is considered to be a new FR mechanism characterized by both tunable ac-ZT coupling and coexistence with shape resonance.The result obtained here is in sharp contrast with the conventional understanding without the introduction of DFR, in which the DL is very stable such that its lifetime is comparable to or greater than that of the associated WSL. It is found that the DFR mechanism generally becomes more dominant with an increase in the strength of the bias field. Further, we discuss the observation that the spectral pattern of the excess DOS is more involved for a single-photon resonant transition, namely, Ω = ω, than that for a two-photon resonant transition, namely, Ω = 2ω, where Ω and ω represent a Bloch frequency and a THz frequency, respectively. In addition, the criterion for the applicability of the DFR to the present system is also obtained.

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Coherent heterodyne time-domain spectrometry covering the entire “terahertz gap”

Cited by 325 publications

References 15 publications

Intense ultrashort terahertz pulses: generation and applications

Intense ultrashort terahertz pulses: generation and applications

Generation of Phase-Stable Sub-Cycle Mid-Infrared Pulses from Filamentation in Nitrogen

Instability of dynamic localization in the intense terahertz-driven semiconductor Wannier-Stark ladder due to the dynamic Fano resonance

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