Single-shot measurement of a terahertz electric-field waveform using a reflective echelon mirror

Minami, Yasuo; Hayashi, Yusuke; Takeda, Jun; Katayama, Ikufumi

doi:10.1063/1.4817011

Cited by 71 publications

(42 citation statements)

References 28 publications

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“…[10]. This may be particularly useful for low-repetition-rate laser systems that require longer acquisition times, and furthermore, it should be compatible with single-shot probing techniques [14,15].…”

Section: Resultsmentioning

confidence: 98%

Distortion-free enhancement of terahertz signals measured by electro-optic sampling II Experiment

et al. 2014

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Three methods for distortion-free enhancement of electro-optic sampling measurements of terahertz signals are tested. In the first part of this two-paper series [J. Opt. Soc. Am B 31, 904-910 (2014)], the theoretical framework for describing the signal enhancement was presented and discussed. As the applied optical bias is decreased, individual signal traces become enhanced but distorted. Here we experimentally show that nonlinear signal components that distort the terahertz electric field measurement can be removed by subtracting traces recorded with opposite optical bias values. In all three methods tested, we observe up to an order of magnitude increase in distortion-free signal enhancement, in agreement with the theory, making possible measurements of small terahertzinduced transient birefringence signals with increased signal-to-noise ratio.

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Section: Resultsmentioning

confidence: 98%

Distortion-free enhancement of terahertz signals measured by electro-optic sampling II Experiment

et al. 2014

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“…10,11 To overcome these limitations, we have recently proposed a scheme for single-shot imaging spectroscopy in time-frequency space using an echelon mirror. Using this technique, we observed ferroelectric phonon-polariton propagations as well as the frequency-resolved optical gating (FROG) traces of the ultrashort laser pulses, 12,13 the terahertz electric field waveforms, 14 and the transient absorption of organic molecules. 15 In this Letter, we present the observation of an ultrafast crystalline-to-amorphous phase transition in crystalline GST thin film using broadband single-shot imaging spectroscopy.…”

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confidence: 99%

Ultrafast crystalline-to-amorphous phase transition in Ge2Sb2Te5 chalcogenide alloy thin film using single-shot imaging spectroscopy

Takeda

Oba

Minami

et al. 2014

Applied Physics Letters

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We have observed an irreversible ultrafast crystalline-to-amorphous phase transition in Ge2Sb2Te5 chalcogenide alloy thin film using broadband single-shot imaging spectroscopy. The absorbance change that accompanied the ultrafast amorphization was measured via single-shot detection even for laser fluences above the critical value, where a permanent amorphized mark was formed. The observed rise time to reach the amorphization was found to be ∼130–200 fs, which was in good agreement with the half period of the A1 phonon frequency in the octahedral GeTe6 structure. This result strongly suggests that the ultrafast amorphization can be attributed to the rearrangement of Ge atoms from an octahedral structure to a tetrahedral structure. Finally, based on the dependence of the absorbance change on the laser fluence, the stability of the photoinduced amorphous phase is discussed.

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“…An alternate scheme which ideally avoids the introduction of large amounts of angular dispersion is a discretely tilted pulse front from a reflective echelon 39 . The reflective echelon consists of many small steps that act as mirrors and split a single input beam into many smaller time-delayed "beamlets", which together create a discretely tilted pulse front as shown in figure 1(a)-(b).…”

Section: Introductionmentioning

confidence: 99%

THz generation using a reflective stair-step echelon

et al. 2016

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We present a novel method for THz generation in lithium niobate using a reflective stair-step echelon structure. The echelon produces a discretely tilted pulse front with less angular dispersion compared to a high groove-density grating. The THz output was characterized using both a 1-lens and 3-lens imaging system to set the tilt angle at room and cryogenic temperatures. Using broadband 800 nm pulses with a pulse energy of 0.95 mJ and a pulse duration of 70 fs (24 nm FWHM bandwidth, 39 fs transform limited width), we produced THz pulses with field strengths as high as 500 kV/cm and pulse energies as high as 3.1 µJ. The highest conversion efficiency we obtained was 0.33%. In addition, we find that the echelon is easily implemented into an experimental setup for quick alignment and optimization.

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Single-shot measurement of a terahertz electric-field waveform using a reflective echelon mirror

Cited by 71 publications

References 28 publications

Distortion-free enhancement of terahertz signals measured by electro-optic sampling II Experiment

Distortion-free enhancement of terahertz signals measured by electro-optic sampling II Experiment

Ultrafast crystalline-to-amorphous phase transition in Ge2Sb2Te5 chalcogenide alloy thin film using single-shot imaging spectroscopy

THz generation using a reflective stair-step echelon

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