Optical rectification of a 100  W average power mode-locked thin-disk oscillator

Meyer, Frank; Hekmat, Negar; Mansourzadeh, Samira; Fobbe, F.; Aslani, Farhad; Hoffmann, Martin; Saraceno, Clara J.

doi:10.1364/ol.43.005909

Cited by 29 publications

(8 citation statements)

References 32 publications

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“…In agreement with [20], we thus conclude that optical rectification in GaP is highly suitable for broadband THz generation driven by high-power Yb-based lasers. Further power scalability has been recently confirmed by Meyer et al utilizing a high-power TDL oscillator combined with an external pulse compression delivering 88 fs pulses at 112 W of average power as a driving source.…”

Section: Resultssupporting

confidence: 89%

“…This was achieved by optical rectification in GaP of 50 fs pulses, delivered by a 4 W TDL oscillator. Shortly after, Meyer et al demonstrated the potential for increasing the available THz power by using a high-power TDL oscillator as a driving source [20]. They showed that 100 W of average laser power with 580 fs pulse duration could be optically rectified in GaP, yielding 80 μW of average THz power with a spectrum extending up to 1.6 THz.…”

Section: Introductionmentioning

confidence: 99%

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Optical rectification of ultrafast Yb lasers: pushing power and bandwidth of terahertz generation in GaP

et al. 2019

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We demonstrate broadband high-power terahertz (THz) generation at megahertz repetition rates by optical rectification in GaP driven by an ultrafast Yb-based thin-disk laser (TDL) oscillator. We investigate the influence of pulse duration in the range of 50-220 fs and thickness of the GaP crystal on the THz generation. Optimization of these parameters with respect to the broadest spectral bandwidth yields a gap-less THz spectrum extending to nearly 7 THz. We further tailor the driving laser and the THz generation parameters for the highest average power, demonstrating 0.3 mW THz radiation with a spectrum extending to 5 THz. This was achieved using a 0.5 mm thick GaP crystal pumped with a 95 fs, 20 W TDL, operating at 48 MHz repetition rate. We also provide a simple method to estimate the THz spectrum, which can be used for design and optimization of similar THz systems

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Optical rectification of ultrafast Yb lasers: pushing power and bandwidth of terahertz generation in GaP

et al. 2019

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“…Moreover, we analyzed the high-frequency noise of the laser using a fast photodiode and a microwave signal analyzer (Rohde & Schwartz FSWP50). The relative intensity noise of better than 0.1% was calculated in the frequency range from 10 Hz to 10 MHz [32]. The high-power oscillator is used to directly drive THz generation in a MgO-doped stoichiometric trapezoid LN crystal with a pulse front tilt of 63° to achieve velocity matching, in a similar layout to [20].…”

Section: Methodsmentioning

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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“…It is important to notice that many new areas will also emerge as these laser systems are explored as driving sources for further nonlinear conversion. In general, there is a clear trend toward extending high-power operation to a wide spectral range ranging all the way from the XUV [40] to the terahertz (THz) regime [41], going through the deep-UV and the mid and far-IR ranges [42].…”

Section: Applicationsmentioning

confidence: 99%

The amazing progress of high-power ultrafast thin-disk lasers

Saraceno¹,

Sutter²,

Metzger³

et al. 2019

J. Eur. Opt. Soc.-Rapid Publ.

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Ultrafast lasers continue to be at the forefront of many scientific breakthroughs and technological achievements and progress in the performance of these systems continue to open doors in many new and exciting interdisciplinary fields. In particular, in the last decade, the average power of ultrafast lasers has seen a significant increase, opening up exciting new perspectives. Among the different technologies that have shaped these advances, thin-disk lasers have generated particularly spectacular breakthroughs. We review here the latest state-of-the-art of the technology and highlight new application fields of these cutting-edge laser systems.

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Optical rectification of a 100 W average power mode-locked thin-disk oscillator

Cited by 29 publications

References 32 publications

Optical rectification of ultrafast Yb lasers: pushing power and bandwidth of terahertz generation in GaP

Optical rectification of ultrafast Yb lasers: pushing power and bandwidth of terahertz generation in GaP

High-Power Lensless THz Imaging of Hidden Objects

The amazing progress of high-power ultrafast thin-disk lasers

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