Extreme ultraviolet light source at a megahertz repetition rate based on high-harmonic generation inside a mode-locked thin-disk laser oscillator

Labaye, François; Gaponenko, Maxim; Wittwer, Valentin J.; Diebold, Andreas; Paradis, Clément; Modsching, Norbert; Merceron, Loïc; Emaury, Florian; Graumann, I. J.; Phillips, Christopher; Saraceno, Clara J.; Kränkel, Christian; Keller, U.; Südmeyer, Thomas

doi:10.1364/ol.42.005170

Cited by 42 publications

(28 citation statements)

References 32 publications

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“…The strongly SPM-broadened regime will soon enable OFCs based on Yb-DPSSL oscillators to operate directly with several tens of watts and sub-100-fs pulse durations [20]. Such systems are highly attractive as compact sources for the generation of extreme ultraviolet OFCs via high harmonics generation in gases directly driven by the oscillator [33][34][35].…”

Section: Discussionmentioning

confidence: 99%

Carrier-envelope offset frequency stabilization of a thin-disk laser oscillator operating in the strongly self-phase modulation broadened regime

Modsching¹,

Paradis²,

Brochard³

et al. 2018

Opt. Express

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We demonstrate the carrier-envelope offset (CEO) frequency stabilization of a Kerr lens mode-locked Yb:Lu 2 O 3 thin-disk laser oscillator operating in the strongly self-phase modulation (SPM) broadened regime. This novel approach allows overcoming the intrinsic gain bandwidth limit and is suited to support frequency combs from sub-100-fs pulse trains with very high output power. In this work, strong intra-oscillator SPM in the Kerr medium enables the optical spectrum of the oscillating pulse to exceed the bandwidth of the gain material Yb:Lu 2 O 3 by a factor of two. This results in the direct generation of 50-fs pulses without the need for external pulse compression. The oscillator delivers an average power of 4.4 W at a repetition rate of 61 MHz. We investigated the cavity dynamics in this regime by characterizing the transfer function of the laser output power for pump power modulation, both in continuous-wave and mode-locked operations. The cavity dynamics in mode-locked operation limit the CEO modulation bandwidth to ~10 kHz. This value is sufficient to achieve a tight phase-lock of the CEO beat via active feedback to the pump current and yields a residual in-loop integrated CEO phase noise of 197 mrad integrated from 1 Hz to 1 MHz.

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Section: Discussionmentioning

confidence: 99%

Carrier-envelope offset frequency stabilization of a thin-disk laser oscillator operating in the strongly self-phase modulation broadened regime

Modsching¹,

Paradis²,

Brochard³

et al. 2018

Opt. Express

Self Cite

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“…These features enabled applications such as high-harmonic generation to the extreme ultraviolet [11] and optical rectification to the THz [12] directly from a laser oscillator. Additionally, the high intracavity power in TDL oscillators can be leveraged to drive intracavity nonlinear-optics experiments [13]. Finally, the recent demonstrations of multi-pass cell compression at 375-W average output power to 170 fs [14] and at 60 W to 16 fs pulses [15], show the possibility to compress the high-power output of these oscillators in order to get the optimal peak power for many nonlinear optics applications.…”

Section: Introductionmentioning

confidence: 99%

Power scaling of ultrafast oscillators: 350-W average-power sub-picosecond thin-disk laser

et al. 2019

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We report a semiconductor saturable absorber mirror (SESAM)-modelocked thin-disk laser oscillator delivering a record 350-W average output power with 940-fs, 39-µJ pulses at 8.88-MHz repetition rate and 37-MW peak power. This oscillator is based on the Yb:YAG gain material and has a large pump spot on the disk. The cavity design includes an imaging scheme, which results in multiple reflections on the disk gain medium to enable a larger output coupling rate compared to those used in thin-disk oscillators with a single reflection on the disk. This reduces the intracavity power for a given output power, thus decreasing the stress on the intracavity components. We operate the laser in a low-pressure environment in order to limit the disk's thermal lensing and drastically reduce the nonlinearity picked up in the intracavity air medium. The combination of the imaging scheme and low-pressure operation paves the way to further power scaling of ultrafast thin-disk oscillators toward the kW milestone.

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“…Although the highest HHG repetition rates have been reported using high-power frequency combs resonantly enhanced in optical cavities, 33,34 their reliability and suitability for time-resolved photoemission have faced skepticism from several authors 8,30,35 . Instead, there has been great investment in other approaches including HHG from high-power Ti:Sapphire and parametric amplifiers, 35,36 HHG from high power fiber lasers, 37,38 HHG generated within 39 and at the output 40 of thin-disk lasers, HHG from solids, 41,42 and HHG in the near-fields of nanostructures 43 . Despite these intense efforts, HHG-based photoemission comparable to that done with tunable synchrotron radiation has not been realized using any platform.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast extreme ultraviolet photoemission without space charge

Corder

Zhao

Bakalis

et al. 2018

Structural Dynamics

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Time- and Angle-resolved photoelectron spectroscopy from surfaces can be used to record the dynamics of electrons and holes in condensed matter on ultrafast time scales. However, ultrafast photoemission experiments using extreme-ultraviolet (XUV) light have previously been limited by either space-charge effects, low photon flux, or limited tuning range. In this article, we describe XUV photoelectron spectroscopy experiments with up to 5 nA of average sample current using a tunable cavity-enhanced high-harmonic source operating at 88 MHz repetition rate. The source delivers >1011 photons/s in isolated harmonics to the sample over a broad photon energy range from 18 to 37 eV with a spot size of 58 × 100 μm2. From photoelectron spectroscopy data, we place conservative upper limits on the XUV pulse duration and photon energy bandwidth of 93 fs and 65 meV, respectively. The high photocurrent, lack of strong space charge distortions of the photoelectron spectra, and excellent isolation of individual harmonic orders allow us to observe laser-induced modifications of the photoelectron spectra at the 10−4 level, enabling time-resolved XUV photoemission experiments in a qualitatively new regime.

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Extreme ultraviolet light source at a megahertz repetition rate based on high-harmonic generation inside a mode-locked thin-disk laser oscillator

Cited by 42 publications

References 32 publications

Carrier-envelope offset frequency stabilization of a thin-disk laser oscillator operating in the strongly self-phase modulation broadened regime

Carrier-envelope offset frequency stabilization of a thin-disk laser oscillator operating in the strongly self-phase modulation broadened regime

Power scaling of ultrafast oscillators: 350-W average-power sub-picosecond thin-disk laser

Ultrafast extreme ultraviolet photoemission without space charge

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