Adaptive shaping of THz-pulses generated in ⟨110⟩ ZnTe crystals

Kohli, Kapil K.; Vaupel, Andreas; Chatterjee, Sangam; Rühle, W. W.

doi:10.1364/josab.26.000a74

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…Phase-stable terahertz transients used for these investigations are typically generated via second-order nonlinear processes like, e.g., optical rectification [10] or difference frequency generation (DFG) [11]. Control of the envelope shape of such waveforms may be achieved by varying either the intensity profile [12][13][14], or the polarization state [15] of the driving pulses, or by employing periodically poled nonlinear crystals with specially designed domain structures [16].…”

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confidence: 99%

Sub-cycle slicing of phase-locked and intense mid-infrared transients

et al. 2014

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We demonstrate sub-cycle manipulation of mid-infrared optical waveforms in the time domain. This goal is accomplished via efficient reflection at a semiconductor surface induced by femtosecond interband excitation. The ultrafast response of this process allows slicing of high-field multi-terahertz transients down to the single optical cycle. Ultrabroadband and phase-stable transients with peak amplitudes beyond 10 MV cm −1 are obtained, paving the way for efficient coherent control of light-matter interaction in the non-perturbative regime. The microscopic analysis of electron-hole plasma generation in germanium reveals a decisive role of two-photon absorption allowing efficient slicing up to midinfrared frequencies.

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confidence: 99%

Sub-cycle slicing of phase-locked and intense mid-infrared transients

et al. 2014

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“…The shaping of THz pulses has known in recent years an impressive experimental development (see e.g. [79,80,81,82,83] to mention a few). These studies show that the shape of the generated THz waveform can be optimized to some extent.…”

Section: Discussionmentioning

confidence: 99%

Shaping of the time evolution of field-free molecular orientation by THz laser pulses

2019

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We present a theoretical study of the shaping of the time-evolution of field-free orientation of linear molecules. We show the extend to which the degree of orientation can be steered along a desired periodic timedependent signal. The objective of this study is not to optimize molecular orientation but to propose a general procedure to precisely control rotational dynamics through the first moment of the molecular axis distribution. Rectangular and triangular signals are taken as illustrative examples. At zero temperature, we compute the quantum states leading to such field-free dynamics. A TeraHertz laser pulse is designed to reach these states by using optimal control techniques. The investigation is extended to the case of non-zero temperature. Due to the complexity of the dynamics, the control protocol is derived with a Monte-Carlo simulated annealing algorithm. A figure of merit based on the Fourier coefficients of the degree of orientation is used. We study the robustness of the control process against temperature effects and amplitude variations of the electric field.

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“…Of particular relevance in the context of the present paper is the coherent control spectroscopy introduced by Ogilvie and co-workers, where the nonlinear nature of two-photon fluorescence provided by shaped optical fields has been exploited for selective substance microscopy of biological materials [11]. In THz frequency region, several methods have been developed for the generation of arbitrary THz waveforms, most of which are based on THz emission by spatially and/or temporally shaped optical pulses [12][13][14][15][16][17][18], or tunable THz waveform generation from quasi-phase matching process [19], or air-plasma breakdown phenomena [20]. However, there are few practical imaging methodologies which explicitly take the full advantage of pulse-shaping capability.…”

Section: Introductionmentioning

confidence: 99%

Terahertz substance imaging by waveform shaping

Kim

Jin

et al. 2012

Opt. Express

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Terahertz pulse shaping technique is used to adaptively design terahertz waveforms of enhanced spectral correlation to particular materials among a given set of materials. In a proof-of-principle experiment performed with a two-dimensional image target consisted of meta-materials of distinctive resonance frequencies, the as-designed waveforms are used to demonstrate terahertz substance imaging. It is hoped that this material-specific terahertz waveforms may enable single- or few-shot terahertz material classification when being used in conjunction with terahertz power measurement.

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Adaptive shaping of THz-pulses generated in ⟨110⟩ ZnTe crystals

Cited by 7 publications

References 14 publications

Sub-cycle slicing of phase-locked and intense mid-infrared transients

Sub-cycle slicing of phase-locked and intense mid-infrared transients

Shaping of the time evolution of field-free molecular orientation by THz laser pulses

Terahertz substance imaging by waveform shaping

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