Highly efficient THz generation by optical rectification of mid-IR pulses in DAST

Gollner, Claudia; Shalaby, Mostafa; Brodeur, Corinne; Astrauskas, Ignas; Jutas, Rokas; Constable, E.; Bergen, Lorenz; Baltuška, Andrius; Pugžlys, Audrius

doi:10.1063/5.0037235

Cited by 34 publications

(23 citation statements)

References 31 publications

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“…The intense THz pulse is generated by optical rectification of mid‐IR fs‐pulses in the organic crystal DAST (4‐ N , N ‐dimethylamino 4′‐ N ′‐methyl‐stilbazolium tosylate) with a repetition rate of 20 Hz, as previously reported in ref. [34] Details on the pulse characterization are found in the Experimental Section and in Supporting Information (Section ). A THz field transient measured with electro‐optic sampling (EOS) and the corresponding THz spectrum are shown in Figure a, with a peak intensity at 1.9 THz and spectral bandwidth of 2.5 THz at full‐width half‐maximum.…”

Section: Resultsmentioning

confidence: 99%

“…Details on the generation scheme are reported in ref. [34] For the characterization of the generated THz pulse, THz radiation was seperated from the mid-IR pump with several long pass filters and focused on a 50 μm thick GaP crystal. The probe pulse was generated in a white light seeded non-collinearly pumped optical parametric amplifier, producing shorter than 50 fs pulses with a tunable central wavelength from 610 to 850 nm.…”

Section: Methodsmentioning

confidence: 99%

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Ultrafast Electro‐Absorption Switching in Colloidal CdSe/CdS Core/Shell Quantum Dots Driven by Intense THz Pulses

Gollner

Jutas

Kreil

et al. 2022

Advanced Optical Materials

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Next‐generation high‐speed optical networks demand the development of ultrafast optical interconnects capable of Tbit s−1 data rates. By utilizing colloidal CdSe/CdS core/shell quantum dots, gated by intense THz pulses, a proof of concept of an all‐optical femtosecond electro‐absorption switch is presented in this work. Without any additional enhancement of the THz electric field, an extinction contrast of more than 6 dB and transmission changes in the visible of more than 15% are achieved, with the latter setting a new record for solution‐processed electro‐absorption materials at room temperature. The absence of physical artifacts, originating from electrodes and field enhancing structures, allows to employ a simple and intuitive numerical model, which rationalizes the large field‐induced electro‐absorption response. Supported by theoretical calculations, the importance of the energy band alignment of heterostructure quantum dots are discussed for the first time and suggest that further improvement of the modulation depth and contrast may be achieved with Type‐II quantum dots.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Ultrafast Electro‐Absorption Switching in Colloidal CdSe/CdS Core/Shell Quantum Dots Driven by Intense THz Pulses

Gollner

Jutas

Kreil

et al. 2022

Advanced Optical Materials

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“…In particular, it was demonstrated that THz to millimeterwave part of the spectrum is emitted in the form of halfcycle field waveforms that can be focused to yield field strengths of 5 MV/cm. Intense sub-cycle THz pulses with sub-millijoule energy and THz conversion efficiency of 2.36%, resulting in THz field amplitudes above 100 MV/cm were produced by co-filamentation of 3.9 μm OPCPA output and its second harmonic in ambient air, paving the way toward free space extreme nonlinear THz optics using table-top laser systems 262 . More recently, record optical-to-THz conversion efficiencies approaching 6% were produced by optical rectification in organic DAST (4-N,N-dimethylamino-4'-N'-methyl-stilbazolium tosylate) crystal using the same OPCPA source 263 .…”

Section: Applicationsmentioning

confidence: 99%

Table-top optical parametric chirped pulse amplifiers: past and present

Dubietis¹,

Matijošius²

2023

OEA

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The generation of power-and wavelength-scalable few optical cycle pulses remains one of the major challenges in modern laser physics. Over the past decade, the development of table-top optical parametric chirped pulse amplificationbased systems was progressing at amazing speed, demonstrating excellent performance characteristics in terms of pulse duration, energy, peak power and repetition rate, which place them at the front line of modern ultrafast laser technology. At present, table-top optical parametric chirped pulse amplifiers comprise a unique class of ultrafast light sources, which currently amplify octave-spanning spectra and produce carrier-envelope phase-stable, few optical cycle pulses with multi-gigawatt to multi-terawatt peak powers and multi-watt average powers, with carrier wavelengths spanning a considerable range of the optical spectrum. This article gives an overview on the state of the art of table-top optical parametric chirped pulse amplifiers, addressing their relevant scientific and technological aspects, and provides a short outlook of practical applications in the growing field of ultrafast science.

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“…For the organic crystal OH1, a conversion efficiency of 3.2% was demonstrated, again at low repetition rate of 10 Hz [9]. By pumping a DAST crystal with mid-IR pulses, Gollner et al achieved a record value of 6% conversion efficiency and 1 mW of THz average power at repetition rate of 20 Hz [10]. BNA is also verywell suited for intense THz generation [11] and has already shown to operate efficiently with Ytterbium-based lasers [12].…”

Section: Introductionmentioning

confidence: 99%

Broadband THz-TDS with 5.6 mW average power at 540 kHz with organic crystal BNA

Mansourzadeh

Vogel

Omar

et al. 2022

2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)

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We demonstrate efficient optical rectification in the organic crystal BNA (N-benzyl-2-methyl-4-nitroaniline), driven by a temporally compressed, commercially available industrial Yb-laser system operating at 540 kHz repetition rate. Our THz source reaches 5.6 mW of THz average power driven by 4.7 W, 45 fs pulses and the resulting THz-TDS combines a very broad bandwidth of 7.5 THz and a high dynamic range of 75 dB (in a measurement time of 70 s). The conversion efficiency at maximum THz power is 0.12%. To the best of our knowledge, this is the highest THz power so far demonstrated with BNA, achieved at a high repetition rate, and enabling to demonstrate a unique combination of bandwidth and dynamic range for THz-spectroscopy applications.

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Highly efficient THz generation by optical rectification of mid-IR pulses in DAST

Cited by 34 publications

References 31 publications

Ultrafast Electro‐Absorption Switching in Colloidal CdSe/CdS Core/Shell Quantum Dots Driven by Intense THz Pulses

Ultrafast Electro‐Absorption Switching in Colloidal CdSe/CdS Core/Shell Quantum Dots Driven by Intense THz Pulses

Table-top optical parametric chirped pulse amplifiers: past and present

Broadband THz-TDS with 5.6 mW average power at 540 kHz with organic crystal BNA

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