Polarization properties of coherent VUV light at 125 nm generated by sum-frequency four-wave mixing in mercury

Museur, L.; Olivero, C.; Riedel, Damien; Castex, M. C.

doi:10.1007/s003400050852

Cited by 16 publications

(5 citation statements)

References 29 publications

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“…This can be done by the use of a circular polarizer [41][42][43] with a transmission of about 5-10 %. Another way of producing circularly polarized 122 nm pulses is to use a combination of linearly and circularly polarized 365 nm pulses to directly produce 122 nm pulses with circular polarization by sum-frequency four-wave mixing [44,45], which is in our case third-harmonic generation. Such a scheme is more complicated to prepare the 365 nm pulses but can be more advantageous to avoid the order-of-magnitude energy loss by the use of a circular polarizer.…”

Section: Modelmentioning

confidence: 99%

A scheme to polarize nuclear-spin of atoms by a sequence of short laser pulses: application to the muonium

Nakajima¹

2010

Opt. Express

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We theoretically show that a sequence of short laser pulses can efficiently polarize nuclear-spin of atoms/ions. This is a variant of optical pumping with an important difference that a sequence of short laser pulses is used instead of a continuous-wave laser. Such a replacement is particularly useful if the pumping wavelength is in the ultraviolet or vacuum-ultraviolet region where obtaining a continuous-wave light source with a sufficient intensity is very difficult. Because of the use of short laser pulses neither hyperfine transitions nor fine structure transitions are spectrally resolved, which is quite in contrast to the standard optical pumping scheme by a continuous-wave laser. As an example we apply the scheme to polarize the muonium (μ(+)e(-), lifetime 2.2 μs), for which the pumping wavelength is 122 nm. From numerical solutions of a set of density matrix equations, we find that the use of only a single, two, and five pulses with a ps duration at the peak intensity of 2×10(8) W/cm(2) and a 5 ns time interval results in the degrees of spin-polarization of 33, 50, and 80 %, respectively, within the time scale of a few tens of ns.

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Section: Modelmentioning

confidence: 99%

A scheme to polarize nuclear-spin of atoms by a sequence of short laser pulses: application to the muonium

Nakajima¹

2010

Opt. Express

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“…The spectrometer was calibrated from absolute energy measurements performed at 193 nm with a pyroelectric detector and the spectral sensitivity curve of the detector given by the supplier. We have shown in a previous paper [25] that the polarization of the VUV wave was identical to the polarization of the wave at ω vis .…”

Section: Methodsmentioning

confidence: 62%

Enhanced generation of vacuum-ultraviolet radiation by four-wave mixing in mercury using pulsed laser vaporization

et al. 2007

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The efficiency of a coherent VUV source at 125 nm, based on 2-photon resonant four-wave mixing in mercury vapor, has been enhanced by up to 2 orders of magnitude. This enhancement was obtained by locally heating a liquid Hg surface with a pulsed excimer laser, resulting in a high density vapor plume in which the nonlinear interaction occurred. Energies up to 5 µJ (1 kW peak power) have been achieved while keeping the overall Hg cell at room temperature, avoiding the use of a complex heat pipe. We have observed a strong saturation of the VUV yield when peak power densities of the fundamental beams exceed the GW/cm 2 range, as well as a large intensity-dependant broadening (up to ~30 cm -1 ) of the two-photon resonance. The source has potential applications for high resolution interference lithography and photochemistry.

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“…Pulsed sources of coherent EUV and soft x-ray light employing high harmonic generation with intensity in the range 10 11 -10 14 W/cm 2 are nowadays available [40], although polarization still remains an issue. Another possibility would be to employ vacuum ultraviolet (VUV) lasers, for which circular polarization is practicable (see, e.g., [41][42][43]), and exploit the Doppler effect such that the photon frequency in the ion's rest frame of reference matches the transition energy. All these laser sources offer a bandwidth of several eV, i.e., much wider than the sub-eV hyperfine structure of 2 3 S 1 .…”

Section: Experimental Requirements and Discussionmentioning

confidence: 99%

Hyperfine transitions in He-like ions as a tool for nuclear-spin-dependent parity-nonconservation studies

2011

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In this paper a scheme is proposed for measuring nuclear-spin-dependent parity-nonconservation effects in highly charged ions. The idea is to employ circularly polarized laser light for inducing the transition between the level (1s2s) 1 S 0 and the hyperfine sublevels of (1s2s) 3 S 1 in He-like ions with nonzero nuclear spin. We argue that an interference between the allowed magnetic dipole M1 and the parity-violating electric dipole E1 decay channel leads to an observable asymmetry of order 10 −7 in the transition cross section, in the atomic range 28 Z 35. Experimental requirements for asymmetry measurements are discussed in the case of He-like 77 34 Se.

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Polarization properties of coherent VUV light at 125 nm generated by sum-frequency four-wave mixing in mercury

Cited by 16 publications

References 29 publications

A scheme to polarize nuclear-spin of atoms by a sequence of short laser pulses: application to the muonium

A scheme to polarize nuclear-spin of atoms by a sequence of short laser pulses: application to the muonium

Enhanced generation of vacuum-ultraviolet radiation by four-wave mixing in mercury using pulsed laser vaporization

Hyperfine transitions in He-like ions as a tool for nuclear-spin-dependent parity-nonconservation studies

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