Power scaling of a high-repetition-rate enhancement cavity

Pupeza, Ioachim; Eidam, Tino; Rauschenberger, J.; Bernhardt, Birgitta; Ozawa, A.; Fill, Ernst E.; Apolonski, Alexander; Udem, Thomas; Limpert, Jens; Alahmed, Z. A.; Azzeer, Abdallah M.; Tünnermann, Andreas; Hänsch, Theodor W.; Krausz, Ferenc

doi:10.1364/ol.35.002052

Cited by 91 publications

(54 citation statements)

References 12 publications

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“…Potential intensity-related limitations are mitigated due to the long pulse durations of the stretched CPA pulses, which, in principle, should allow for much higher pulse energies in a loaded cavity than fs-or ps-pulses did in the past. 30 A schematic drawing of the basic concept is depicted in Figure 1a. For their temporal stacking, the pulses are coupled into a cavity with a length corresponding to the repetition rate f rep of the incident pulse train, which is typically on the order of 10 MHz.…”

Section: Methodsmentioning

confidence: 99%

“…Steady-state is reached when the energy coupled to the cavity balances exactly the roundtrip losses L. Typically, a power enhancement of a few orders of magnitude can be achieved. 30,36 However, before this state is reached, in the SnD concept the intracavity pulse is coupled out via a switch faster than 1/f rep and at a switching rate f switch before the next stacking period begins, i.e., the cavity is operated in a non-steady-state regime.…”

Section: Methodsmentioning

confidence: 99%

“…After a certain number of pulses, i.e., one stacking period, a fast switching element is used to couple out the intense circulating pulse, which is then compressed back to its fs-duration. Although the use of cavity-dumped enhanced pulses has already been demonstrated in the past for low-power systems, 28,29 the combination of today's femtosecond laser systems together with state-of-the-art enhancement cavities 30 can result in a new class of laser output parameters vastly outperforming anything demonstrated before. In general, this 'stack-and-dump' (SnD) technique can be applied to any existing amplifier technology.…”

Section: Introductionmentioning

confidence: 99%

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A concept for multiterawatt fibre lasers based on coherent pulse stacking in passive cavities

et al. 2014

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Since the advent of femtosecond lasers, performance improvements have constantly impacted on existing applications and enabled novel applications. However, one performance feature bearing the potential of a quantum leap for high-field applications is still not available: the simultaneous emission of extremely high peak and average powers. Emerging applications such as laser particle acceleration require exactly this performance regime and, therefore, challenge laser technology at large. On the one hand, canonical bulk systems can provide pulse peak powers in the multi-terawatt to petawatt range, while on the other hand, advanced solid-state-laser concepts such as the thin disk, slab or fibre are well known for their high efficiency and their ability to emit high average powers in the kilowatt range with excellent beam quality. In this contribution, a compact laser system capable of simultaneously providing high peak and average powers with high wall-plug efficiency is proposed and analysed. The concept is based on the temporal coherent combination (pulse stacking) of a pulse train emitted from a high-repetition-rate femtosecond laser system in a passive enhancement cavity. Thus, the pulse energy is increased at the cost of the repetition rate while almost preserving the average power. The concept relies on a fast switching element for dumping the enhanced pulse out of the cavity. The switch constitutes the key challenge of our proposal. Addressing this challenge could, for the first time, allow the highly efficient dumping of joule-class pulses at megawatt average power levels and lead to unprecedented laser parameters.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A concept for multiterawatt fibre lasers based on coherent pulse stacking in passive cavities

et al. 2014

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“…Optical damage is among the challenges towards scaling up the power of such systems. Moreover, their output is often intensified further in regenerative amplifiers [13], optical parametric amplification (OPA) stages [14], and inside enhancement cavities [15,16]. The latter can reach average intracavity power of several tens of kW, which is limited by the damage threshold of optical coatings [15,17].…”

Section: Introductionmentioning

confidence: 99%

Optical breakdown of multilayer thin-films induced by ultrashort pulses at MHz repetition rates

Angelov¹,

Pechmann²,

Trubetskov³

et al. 2013

Opt. Express

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Multilayer coatings composed of TiO 2 , Ta 2 O 5 , HfO 2 , or Al 2 O 3 as high-index materials and SiO 2 as low-index material were investigated for laser-induced damage using 1 ps, 5 µJ pulses generated by a mode-locked Yb:YAG thin-disk oscillator operating at a wavelength of 1030 nm and repetition rate of 11.5 MHz. Previously reported linear band gap dependence of damage threshold at kHz repetition rates was confirmed also for the MHz regime. Additionally, we studied the effect of electric field distribution inside of the layer stack. We did not observe any significant influence of thermal effects on the laser-induced damage threshold in this regime.

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“…Femtosecond ECs, seeded by Ti:Sa-based lasers were first demonstrated in 2005 [6,7]. More recently, advances in Yb-based fiber laser technology enabled reaching higher circulating powers in ECs [5,8], resulting in higher photon energies and higher XUV average powers. However, due to the narrower gain bandwidth of Yb-doped active materials, these systems operate with pulse durations significantly longer than 100 fs.…”

Section: Introductionmentioning

confidence: 99%

Generation of Coherent sub-20 nm XUV Radiation at 78 MHz via Cavity-Based HHG

Pupeza

Holzberger

Eidam

et al. 2013

EPJ Web of Conferences

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Abstract. We present two major advances of enhancement-cavity-based high-order harmonic generation (HHG). First, the generated extreme ultraviolet (XUV) radiation is coupled out collinearly through an on-axis opening in the mirror following the HHG focus. This minimizes the interaction of both the fundamental and the intracavity generated radiation with the output coupler while simultaneously enabling a large enhancement and an output coupling efficiency that increases with the harmonic order. Second, we use the nonlinearly compressed pulses of an Yb-based laser to drive intracavity HHG allowing for a unique power regime combining short pulses with high average powers. Together, these advances overcome fundamental limitations of current enhancement cavity setups and extend intracavity HHG towards higher photon energies. In a proof-of-principle experiment we use a 3-kW and 78-MHz train of 54-fs to generate and couple out coherent sub-20 nm radiation.

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Power scaling of a high-repetition-rate enhancement cavity

Cited by 91 publications

References 12 publications

A concept for multiterawatt fibre lasers based on coherent pulse stacking in passive cavities

A concept for multiterawatt fibre lasers based on coherent pulse stacking in passive cavities

Optical breakdown of multilayer thin-films induced by ultrashort pulses at MHz repetition rates

Generation of Coherent sub-20 nm XUV Radiation at 78 MHz via Cavity-Based HHG

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