Scalable terahertz generation by large-area optical rectification at 80 TW laser power

Jang, Dogeun; Kang, Chul; Lee, Seong Ku; Sung, Jae Hee; Kee, Chul‐Sik; Kang, Seoktae; Kim, Ki-Yong

doi:10.1364/ol.44.005634

Cited by 19 publications

(17 citation statements)

References 24 publications

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“…The 1.4 mJ THz energy is the first high energy solid‐state THz source with single pulse energy higher than 1 mJ, which is 1.6 times of organic crystal record number, [ 52 ] 3.5 times of that from current LN‐TPF driven by 1 µm central wavelength, [ 51 ] 7.4 times that from both two‐color air plasma sources and LN wafers driven by 2 J Ti:sapphire lasers. [ 12,59 ] Although the absolute THz energy in our case is not that high compared with solid‐plasma THz sources via transition radiation mechanism, [ 14 ] the solid‐plasma sources require tens of joules pump laser energies which are not easy to be accessible. LN‐based intense THz sources are much easier to implement and less expensive.…”

Section: Resultsmentioning

confidence: 99%

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1.4‐mJ High Energy Terahertz Radiation from Lithium Niobates

Zhang

et al. 2021

Laser & Photonics Reviews

130

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Free‐space super‐strong terahertz (THz) electromagnetic fields offer multifaceted capabilities for reaching extreme nonlinear THz optics. However, the lack of powerful solid‐state THz sources with single pulse energy >1 mJ is impeding the proliferation of extreme THz applications. The fundamental challenge lies in hard to achieve high efficiency due to high intensity pumping caused crystal damage, linear absorption, and nonlinear distortion induced short effective interaction length, and so on. Here, through cryogenically cooling the crystals, tailoring the pump laser spectra, chirping the pump pulses, and magnifying the laser energies, 1.4‐mJ THz pulses are successfully realized in lithium niobates under the excitation of 214‐mJ femtosecond laser pulses via tilted pulse front technique. The 800 nm‐to‐THz energy conversion efficiency reaches 0.7%, and a free‐space THz peak electric and magnetic field reaches 6.3 MV cm−1 and 2.1 Tesla. Numerical simulations reproduce the experimental optimization processes. To show the capability of this super‐strong THz source, nonlinear absorption in high conductive silicon induced by strong THz electric field is demonstrated. Such a high‐energy THz source with a relatively low peak frequency is very appropriate not only for electron acceleration toward table‐top X‐ray sources but also for extreme THz science and nonlinear applications.

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Section: Resultsmentioning

confidence: 99%

“…[ 55 ] Such a phenomenon has also been reported in high energy THz generation from LN wafers driven by 2 J laser pulses. [ 59 ]…”

Section: Resultsmentioning

confidence: 99%

1.4‐mJ High Energy Terahertz Radiation from Lithium Niobates

Zhang

et al. 2021

Laser & Photonics Reviews

130

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“… 139 The maximum energy of pulsed THz wave radiated from

crystal was improved to

by Jang et al. 140 The highest average THz power of about 66 mW in the 0.1 to 4.0 THz range has been obtained with a few-cycle ultrafast laser-driven THz source by Meyer et al. 141 through optimizing pump spot size and pump pulse duration.…”

Section: Modern Thz-wave Emittersmentioning

confidence: 99%

“…The maximum energy of up to 10 μJ was detected at the frequency of 0.5 THz, which corresponds to the opticalto-THz energy conversion efficiency of ∼6 × 10 −4 . 139 The maximum energy of pulsed THz wave radiated from LiNbO 3 crystal was improved to 180 μJ by Jang et al 140 The highest average THz power of about 66 mW in the 0.1 to 4.0 THz range has been obtained with a few-cycle ultrafast laser-driven THz source by Meyer et al 141 through optimizing pump spot size and pump pulse duration. Both studies achieved a conversion efficiency on the order of ∼10 −4 .…”

Section: Optical Rectificationmentioning

confidence: 99%

Cellular effects of terahertz waves

et al. 2021

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. Significance: An increasing interest in the area of biological effects at exposure of tissues and cells to the terahertz (THz) radiation is driven by a rapid progress in THz biophotonics, observed during the past decades. Despite the attractiveness of THz technology for medical diagnosis and therapy, there is still quite limited knowledge about safe limits of THz exposure. Different modes of THz exposure of tissues and cells, including continuous-wave versus pulsed radiation, various powers, and number and duration of exposure cycles, ought to be systematically studied. Aim: We provide an overview of recent research results in the area of biological effects at exposure of tissues and cells to THz waves. Approach: We start with a brief overview of general features of the THz-wave–tissue interactions, as well as modern THz emitters, with an emphasis on those that are reliable for studying the biological effects of THz waves. Then, we consider three levels of biological system organization, at which the exposure effects are considered: (i) solutions of biological molecules; (ii) cultures of cells, individual cells, and cell structures; and (iii) entire organs or organisms; special attention is devoted to the cellular level. We distinguish thermal and nonthermal mechanisms of THz-wave–cell interactions and discuss a problem of adequate estimation of the THz biological effects’ specificity. The problem of experimental data reproducibility, caused by rareness of the THz experimental setups and an absence of unitary protocols, is also considered. Results: The summarized data demonstrate the current stage of the research activity and knowledge about the THz exposure on living objects. Conclusions: This review helps the biomedical optics community to summarize up-to-date knowledge in the area of cell exposure to THz radiation, and paves the ways for the development of THz safety standards and THz therapeutic applications.

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“…Lately, a planar LN wafer with large-aperture (75-mm diameter) has been used to generate high-energy (0.19 mJ) terahertz pulses at <5 THz [14]. This planar geometry permits convenient energy-upscalable terahertz generation.…”

Section: Introductionmentioning

confidence: 99%

Generation of 0.7 mJ multicycle 15 THz radiation by phase-matched optical rectification in lithium niobate

Jang,

Sung,

Lee

et al. 2020

Preprint

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We demonstrate efficient multicycle terahertz pulse generation at 14.6 THz from large-area lithium niobate crystals by using high-energy (up to 2 J) femtosecond Ti:sapphire laser pulses. Such terahertz radiation is produced by phase-matched optical rectification in lithium niobate. Experimentally, we achieve maximal terahertz energy of 0.71 mJ with conversion efficiency of ∼0.04%. We also find that the effective interaction length for optimal terahertz conversion is fundamentally limited by terahertz absorption, laser pulse stretching by material dispersion, and terahertz-induced nonlinear cascading effects on the driving laser pulse.

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Scalable terahertz generation by large-area optical rectification at 80 TW laser power

Abstract: c) x-cut, 1mm thick LN 0.6 J 1.2 J 2 J 0.6 J 1.2 J 2 J 0.6 J 2 J

Cited by 19 publications

References 24 publications

1.4‐mJ High Energy Terahertz Radiation from Lithium Niobates

1.4‐mJ High Energy Terahertz Radiation from Lithium Niobates

Cellular effects of terahertz waves

Generation of 0.7 mJ multicycle 15 THz radiation by phase-matched optical rectification in lithium niobate

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