Generation of vacuum ultraviolet radiation by intracavity high-harmonic generation toward state detection of single trapped ions

Wakui, Kentaro; Hayasaka, Kazuhiro; Ido, T.

doi:10.1007/s00340-014-5914-y

Cited by 15 publications

(8 citation statements)

References 52 publications

(77 reference statements)

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“…4 . They include single-ion spectroscopy for optical-frequency standards: 1 S 0 to 1 P 1 transition of Al + (167 nm) 33 and that of In + (159 nm) 34 ; laser cooling of hydrogen and antihydrogen for testing the standard theory: Lyman-α transition at 121.56 nm 35 36 . Scalability to ultrahigh power will also be attractive from an industry perspective (e.g.…”

Section: Resultsmentioning

confidence: 99%

Freely designable optical frequency conversion in Raman-resonant four-wave-mixing process

Jian

Katsuragawa

2015

Sci Rep

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Nonlinear optical processes are governed by the relative-phase relationships among the relevant electromagnetic fields in these processes. In this Report, we describe the physics of arbitrary manipulation of Raman-resonant four-wave-mixing process by artificial control of relative phases. As a typical example, we show freely designable optical-frequency conversions to extreme spectral regions, mid-infrared and vacuum-ultraviolet, with near-unity quantum efficiencies. Furthermore, we show that such optical-frequency conversions can be realized by using a surprisingly simple technology where transparent plates are placed in a nonlinear optical medium and their positions and thicknesses are adjusted precisely. In a numerical simulation assuming practically applicable parameters in detail, we demonstrate a single-frequency tunable laser that covers the whole vacuum-ultraviolet spectral range of 120 to 200 nm.

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Section: Resultsmentioning

confidence: 99%

Freely designable optical frequency conversion in Raman-resonant four-wave-mixing process

Jian

Katsuragawa

2015

Sci Rep

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“…Realization of such a VUV source is an essential step e.g. for the precise measurement of optical transition of the 229 Th nucleus or for the realization of an 115 In+ optical clock [23].…”

Section: Discussionmentioning

confidence: 99%

Non-planar femtosecond enhancement cavity for VUV frequency comb applications

et al. 2016

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External passive femtosecond enhancement cavities (fsECs) are widely used to increase the efficiency of non-linear conversion processes like high harmonic generation (HHG) at high repetition rates. Their performance is often limited by beam ellipticity, caused by oblique incidence on spherical focusing mirrors. We introduce a novel three-dimensionally folded variant of the typical planar bow-tie resonator geometry that guarantees circular beam profiles, maintains linear polarization, and allows for a significantly tighter focus as well as a larger beam cross-section on the cavity mirrors. The scheme is applied to improve focusing in a Ti:Sapphire based VUV frequency comb system, targeting the 5th harmonic around 160 nm (7.8 eV) towards high-precision spectroscopy of the low-energy isomer state of Thorium-229. It will also be beneficial in fsEC-applications with even higher seeding and intracavity power where the damage threshold of the mirrors becomes a major concern.

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“…The cavity alignment and focusing conditions are monitored at the secondary focus by observing leaked signal from one of the cavity mirrors. The generated 5 th harmonic beam (central wavelength at 160 nm) is extracted from the cavity using a multilayer mirror designed for >90% reflectivity within the 150-170 nm spectral range [16]. The output coupler mirror is placed far from the focus to avoid damage of the multilayer coating.…”

Section: Methodsmentioning

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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Generation of vacuum ultraviolet radiation by intracavity high-harmonic generation toward state detection of single trapped ions

Cited by 15 publications

References 52 publications

Freely designable optical frequency conversion in Raman-resonant four-wave-mixing process

Freely designable optical frequency conversion in Raman-resonant four-wave-mixing process

Non-planar femtosecond enhancement cavity for VUV frequency comb applications

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

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