Milliwatt-class broadband THz source driven by a 112 W, sub-100 fs thin-disk laser

Meyer, Frank; Hekmat, Negar; Vogel, Tim; Omar, Alan; Mansourzadeh, Samira; Fobbe, F.; Hoffmann, Martin; Wang, Yicheng; Saraceno, Clara J.

doi:10.1364/oe.27.030340

Cited by 56 publications

(22 citation statements)

References 37 publications

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“…In particular, high energy thin disk oscillators perfectly fit this parameter range, and have been associated to nonlinear MPCs to decrease the pulse duration of Yb-doped crystals such as LuAG and YAG from >500 fs to <100 fs. [61][62][63] Although it was not the case in the first demonstration, the nonlinear medium is usually a plate located close to the MPC waist. Separating it from the substrate mirrors allows more design freedom, an easier replacement, and fine tuning of the nonlinearity by moving it from the beam waist toward the cell mirrors.…”

Section: Mpcs Including Platesmentioning

confidence: 99%

Nonlinear Optics in Multipass Cells

Hanna

Guichard

Daher

et al. 2021

Laser & Photonics Reviews

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The fundamental principles and experimental implementations of multipass cells used as a platform for nonlinear optics are reviewed. Embedding a nonlinear medium in a multipass cell allows for a distribution of the nonlinearity over large interaction distances, while the beam goes through multiple foci, conferring on the beam a robustness with respect to spatio-spectral coupling effects. Most of the research so far has been focused on temporal compression based on self-phase modulation, with excellent performances especially in terms of energy scaling and throughput. However, other nonlinear phenomena and functions are being increasingly investigated, such as supercontinuum generation, spectral compression, or Raman scattering. Nonlinear optics experiments in multipass cells bear some similarities with the work done in optical fibers over several decades, while allowing straightforward energy scaling potential, and unlocking engineering possibilities through the design of the cell mirrors, geometry, and nonlinear medium.

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Section: Mpcs Including Platesmentioning

confidence: 99%

Nonlinear Optics in Multipass Cells

Hanna

Guichard

Daher

et al. 2021

Laser & Photonics Reviews

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“…In this respect, one high-average power ultrafast laser technology stands out as particularly promising, namely modelocked thin-disk laser (TDL) oscillators, to drive THz generation [24]. These onebox modelocked oscillators operate at MHz repetition rates but outperform other oscillator technologies by several orders of magnitude in terms of average power [20], [25], providing the same output power levels as complex multi-chain amplifiers with additional advantages such as potentially lownoise levels close to the quantum limit of high-Q resonator [26] and transform-limited femtosecond pulses. The state-of-the-art of these oscillators is 350 W average power with pulse duration of 940 fs, and a repetition rate of 8.88 MHz [27], and 80-µJ pulse energy at 242 W of average power [28].…”

Section: Introductionmentioning

confidence: 99%

High-Power Lensless THz Imaging of Hidden Objects

et al. 2021

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The potential of pulsed THz radiation for time-of-flight imaging applications is well recognized. However, advances in this field are currently severely limited by the low average power of ultrafast THz sources. Typically, this results in impractically long acquisition times and a loss in resolution and contrast. These limitations make imaging of the objects in real-life scenarios impossible. Here, conclusively, the potential of state-of-the-art high-average power THz time-domain spectrometer (TDS), driven by a 100-W class, one-box ultrafast oscillator for imaging applications is shown by demonstrating lensless THz imaging in reflection mode of a dielectric sample with low reflectivity. Images obtained with our home-built 20-mW average power THz-TDS system show a significant contrast enhancement compared to a state-of-the-art commercial THz-TDS with less than 200 µW of average power. Our unique setup even allows us to obtain images of such an object with high-contrast hidden inside a medium-density fiberboard (MDF) box. This opens the door to THz time-of-flight imaging of concealed objects of unknown shape and orientation in various real-life scenarios which were so far impossible to realize. INDEX TERMS High-power terahertz radiation, lensless terahertz imaging, terahertz time-domain spectroscopy

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“…While high-power multi-MHz repetition rate-systems have great potential to enhance (time-resolved) spectroscopic applications, efficient compression schemes to reach below 10 fs are still to be developed. Promising applications for such systems are singlepass [11] or resonator-enhanced [12] extreme-ultraviolet generation [13], terahertz [14,15] and mid-infrared (MIR) generation [16]. Kerr-lens mode-locked (KLM) Yb:YAG thin-disk (TD) oscillators with their ability in delivering more than 100 W average power with pulse durations below 200 fs, combine high peak and high average powers in a relative compact setup [17].…”

Section: Introductionmentioning

confidence: 99%

Efficient nonlinear compression of a thin-disk oscillator to 8.5 fs at 55 W average power

Barbiero,

Wang,

Graßl

et al. 2021

Preprint

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We demonstrate an efficient hybrid-scheme for nonlinear pulse compression of high-power thindisk oscillator pulses to the sub-10 fs regime. The output of a home-built, 16 MHz, 84 W, 220 fs Yb:YAG thin-disk oscillator at 1030 nm is first compressed to 17 fs in two nonlinear multipass cells. In a third stage, based on multiple thin sapphire plates, further compression to 8.5 fs with 55 W output power and an overall optical efficiency of 65% is achieved. By sending the 2.5-cycle pulses into a lithium iodate crystal, we were able to generate ultra-broadband mid-infrared pulses covering the spectral range 2.4-8 µm.

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Milliwatt-class broadband THz source driven by a 112 W, sub-100 fs thin-disk laser

Cited by 56 publications

References 37 publications

Nonlinear Optics in Multipass Cells

Nonlinear Optics in Multipass Cells

High-Power Lensless THz Imaging of Hidden Objects

Efficient nonlinear compression of a thin-disk oscillator to 8.5 fs at 55 W average power

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