Optical generation of single-cycle 10 MW peak power 100 GHz waves

Wu, Xiaojun; Calendron, Anne-Laure; Ravi, Koustuban; Zhou, Chun; Hemmer, Michaël; Reichert, Fabian; Zhang, Dongfang; Çankaya, Hüseyin; Zapata, Luis E.; Matlis, Nicholas H.; Kärtner, Franz X.

doi:10.1364/oe.24.021059

Cited by 13 publications

(6 citation statements)

References 37 publications

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“…The third spatial dimension (y) maybe ignored since diffraction effects of both terahertz and pump waves in this direction are negligible for large beams. The model accounts for various spatio-temporal distortions of the optical pulse such as angular dispersion and spatial chirp, which enables accurate quantitative predictions as verified by prior experiments [382,383].…”

Section: Single-cycle Thz Generationmentioning

confidence: 74%

Terahertz Acceleration Technology Towards Compact Light Sources

Fallahi¹

2019

Preprint

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Section: Single-cycle Thz Generationmentioning

confidence: 74%

Terahertz Acceleration Technology Towards Compact Light Sources

Fallahi¹

2019

Preprint

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“…[38] Such a saturation phenomenon is unusual compared to our previous THz generation implementations, which utilized ultrashort-pulse laser-pumped lithium niobate crystals without vertically focusing the laser spot beam. [42][43][44] However, this behavior was observed when a tightly focused method was employed. [41] As shown in Figure 3a, we hypothesize that other competitive nonlinear phenomena, such as the SPM effect, occur in the crystals owing to the high-intensity pump, degrading the pump spectrum and lowering the THz radiation efficiency.…”

Section: Room-temperature High-energy Thz Generationmentioning

confidence: 99%

Generation of 13.9‐mJ Terahertz Radiation from Lithium Niobate Materials

Kong

Hao

et al. 2023

Advanced Materials

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Extremely strong‐field terahertz (THz) radiation in free space has compelling applications in nonequilibrium condensed matter state regulation, all‐optical THz electron acceleration and manipulation, THz biological effects, etc. However, these practical applications are constrained by the absence of high‐intensity, high‐efficiency, high‐beam‐quality, and stable solid‐state THz light sources. Here, the generation of single‐cycle 13.9‐mJ extreme THz pulses from cryogenically cooled lithium niobate crystals and a 1.2% energy conversion efficiency from 800 nm to THz are demonstrated experimentally using the tilted pulse‐front technique driven by a home‐built 30‐fs, 1.2‐Joule Ti:sapphire laser amplifier. The focused peak electric field strength is estimated to be 7.5 MV cm−1. A record of 1.1‐mJ THz single‐pulse energy at a 450 mJ pump at room temperature is produced and observed that the self‐phase modulation of the optical pump can induce THz saturation behavior from the crystals in the substantially nonlinear pump regime. This study lays the foundation for the generation of sub‐Joule THz radiation from lithium niobate crystals and will inspire more innovations in extreme THz science and applications.

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“…Most setups utilize a single lens for imaging the tilted-pulse front into the crystal whereas others rely on a telescope for imaging. One advantage of the single-lens setup is, that the magnification and thus both the pulse-front-tilt angle and the angle of the image can be tuned via adjusting the grating-lens and lens-crystal distances, often used as optimization procedure in experiments 34,35,38,58,60 . However, it is harder to decouple effects due to a change in pump fluence from effects caused by the altered angles of pulse-front tilt and image plane during this optimization procedure and determine a global optimum of the THz efficiency since all three parameters are simultaneously changed.…”

Section: Setup Design: a Practical View On Choosing A Proper Imaging Setup For The Optimization Proceduresmentioning

confidence: 99%

Robust optimization of single-cycle THz setups based on phase-matching via tilted pulse fronts using an incident-fluence metric

Kroh

Rohwer

Wang

et al. 2020

Nonlinear Frequency Generation and Conversion: Materials and Devices XIX

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Despite the popularity and ubiquitousness of the tilted-pulse-front technique for single-cycle terahertz (THz) generation, optimization of the experimental setup remains complex and difficult due to the sensitive dependence on and coupling between the optical pulse parameters, including fluence, beam size, angular dispersion and temporal compression. Here we present a systematic and robust method to tune the tilted pulse-front setup, based on use of selected multi-dimensional scans, which enables a straight-forward and accurate determination of optimum parameter values. Our methodology not only allows us to determine parameter sensitivities and achieve a robust optimum in the performance, but also enables a verification of certain physical properties of the lithium niobate prism, including the THz refractive index. The detailed step-by-step procedure is discussed and applied to a tilted-pulse-front THz setup at both room temperature and cryogenic temperatures. The procedure can be applied to any setup based on the tilted-pulse-front geometry and is important for the construction of high energy THz sources required for strong field terahertz applications such as novel particle acceleration schemes or beam manipulators.

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Optical generation of single-cycle 10 MW peak power 100 GHz waves

Cited by 13 publications

References 37 publications

Terahertz Acceleration Technology Towards Compact Light Sources

Terahertz Acceleration Technology Towards Compact Light Sources

Generation of 13.9‐mJ Terahertz Radiation from Lithium Niobate Materials

Robust optimization of single-cycle THz setups based on phase-matching via tilted pulse fronts using an incident-fluence metric

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