Non-planar femtosecond enhancement cavity for VUV frequency comb applications

Winkler, Georg; Fellinger, Jakob; Seres, J.; Seres, E.; Schumm, Thorsten

doi:10.1364/oe.24.005253

Cited by 12 publications

(6 citation statements)

References 25 publications

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“…In solids, harmonics can be generated at much lower laser intensities than in gases, promising the extension of HHG into very compact laser sources and with very high repetition rates, reaching even GHz frequencies. Such high repetition rates would be very beneficial for time-resolved spectroscopic applications, and VUV or EUV frequency combs [5][6][7] could also be realized in solids for high precision metrology. Consequently, HHG in solids is being extensively explored both experimentally and theoretically.…”

Section: Introductionmentioning

confidence: 99%

Non-perturbative generation of DUV/VUV harmonics from crystal surfaces at 108 MHz repetition rate

Seres¹,

Seres²,

Serrat³

et al. 2018

Opt. Express

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We demonstrate non-perturbative 3rd (267 nm) and 5th (160 nm) harmonic generation in solids from a Ti:sapphire frequency comb (800 nm) at 108 MHz repetition rate. The experiments show that non-perturbative low harmonics are dominantly generated on the surface and on the interface between solids, and that they are not produced by bulk processes from the near-surface layer of the material. Measurements reveal that due to the lack of phase matching, the generated harmonics in bulk are suppressed by orders of magnitude compared to the signal generated on the surface. Our results pave the way for the development of all-solid-state high repetition rate harmonic sources for vacuum ultraviolet spectroscopy and high precision frequency comb metrology.

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Section: Introductionmentioning

confidence: 99%

Non-perturbative generation of DUV/VUV harmonics from crystal surfaces at 108 MHz repetition rate

Seres¹,

Seres²,

Serrat³

et al. 2018

Opt. Express

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show abstract

“…The achievable precision would be determined by the bandwidth of the laser light used for excitation, which is ≈ 10 GHz (40 µeV). An alternative approach is based on a VUV frequency comb generated from the 5th harmonic of a Ti:Sapphire laser and is under development at TU Vienna [324,408]. A system that operates with the 7th harmonic of an Yb:doped fiber laser is located at JILA, Boulder, CO [406,418].…”

Section: Population Via Direct Excitationmentioning

confidence: 99%

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

Wense

2020

Eur. Phys. J. A

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The proposal for the development of a nuclear optical clock has triggered a multitude of experimental and theoretical studies. In particular the prediction of an unprecedented systematic frequency uncertainty of about $$10^{-19}$$ 10 - 19 has rendered a nuclear clock an interesting tool for many applications, potentially even for a re-definition of the second. The focus of the corresponding research is a nuclear transition of the $$^{229}$$ 229 Th nucleus, which possesses a uniquely low nuclear excitation energy of only $$8.12\pm 0.11$$ 8.12 ± 0.11 eV ($$152.7\pm 2.1$$ 152.7 ± 2.1 nm). This energy is sufficiently low to allow for nuclear laser spectroscopy, an inherent requirement for a nuclear clock. Recently, some significant progress toward the development of a nuclear frequency standard has been made and by today there is no doubt that a nuclear clock will become reality, most likely not even in the too far future. Here we present a comprehensive review of the current status of nuclear clock development with the objective of providing a rather complete list of literature related to the topic, which could serve as a reference for future investigations.

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“…We performed calculation series for sapphire alone (band gap E g = 8.7 eV, reduced effective mass of electron-hole pairs m* = 0.3, and lattice constant a = 0.476 nm) and for AlN (E g = 6.3 eV, m* = 0.4, and a = 0.310 nm). For AlN, the transition dipole moment at the band gap was estimated from the known absorption coefficient α = 3×10 5 cm -1 , and the effective density of states at the CB edge N c = 6.2×10 18 Cm. No estimation of the dipole moment could be performed for sapphire.…”

Section: Bandgap Tuning: Using Aln Film As Mhg Sourcementioning

confidence: 99%

“…To reach short wavelengths at high repetition rates, non-perturbative highharmonic generation is currently the only candidate. Such high-harmonic sources were successfully realized by adding an enhancement cavity to fiber laser systems or Ti:sapphire oscillators [13][14][15][16][17][18]. In these realizations, different noble gases were used for non-perturbative frequency conversion, which relies on the ionization of the gases and hence requires suitably high (> 10 13 W/cm 2 ) laser peak intensity.…”

Section: Introductionmentioning

confidence: 99%

All-solid-state VUV frequency comb at 160 nm using high-harmonic generation in nonlinear femtosecond enhancement cavity

Seres¹,

Seres²,

Serrat³

et al. 2019

Opt. Express

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We report on the realization of a solid-state-based vacuum ultraviolet frequency comb, using multiharmonic generation in an external enhancement cavity. Optical conversions in such arrangements were so-far reported only using gaseous media. We present a theory that allows selecting the most suited solid generation medium for specific target harmonics by adapting the bandgap of the material. Consequently, we experimentally use a thin AlN film grown on a sapphire substrate to realize a compact frequency comb multi-harmonic source in the DUV/VUV spectral range. Extending our earlier VUV source [Opt. Exp. 26, 21900 (2018)] with the enhancement cavity, a sub-Watt level Ti:sapphire femtosecond frequency comb is enhanced to 24 W stored average power, its 3 rd , 5 th and 7 th harmonics are generated, and the target harmonic power at 160 nm increased by two orders of magnitude. The emerging non-linear effects in the solid medium together with suitable intra-cavity dispersion management support optimal enhancement and stable locking. To demonstrate the spectroscopic ability of the realized frequency comb, we report on the beat measurement between the 3 rd harmonic beam and a 266 nm CW laser reaching about 1 MHz accuracy.

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Non-planar femtosecond enhancement cavity for VUV frequency comb applications

Cited by 12 publications

References 25 publications

Non-perturbative generation of DUV/VUV harmonics from crystal surfaces at 108 MHz repetition rate

Non-perturbative generation of DUV/VUV harmonics from crystal surfaces at 108 MHz repetition rate

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

All-solid-state VUV frequency comb at 160 nm using high-harmonic generation in nonlinear femtosecond enhancement cavity

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