Noise spectroscopy of an optical microresonator

Kozlov, G. G.

doi:10.1134/s1063776113040055

Cited by 2 publications

(2 citation statements)

References 13 publications

(13 reference statements)

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“…Selection. Lacking data, we used the additive rule for the double capture by H 2 , which is well documented (Allison 1958;McClure 1963;Kozlov & Bondar' 1966;Williams 1966;Schryber 1967;Toburen & Nakai 1969;Salazar-Zepeda et al 2010), and O 2 (Allison 1958, given per atom of oxygen) at low proton impact energies. We supplement these estimates with the measurements in water by Toburen & Nakai (1969) at high energies.…”

Section: H + -H 2 Omentioning

confidence: 99%

Solar wind charge exchange in cometary atmospheres

Wedlund

Bodewits

Alho

et al. 2019

A&A

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Context. Solar wind charge-changing reactions are of paramount importance to the physico-chemistry of the atmosphere of a comet, mass-loading the solar wind through an effective conversion of fast light solar wind ions into slow heavy cometary ions. Aims. To understand these processes and place them in the context of a solar wind plasma interacting with a neutral atmosphere, numerical or analytical models are necessary. Inputs of these models, such as collision cross sections and chemistry, are crucial. Methods. Book-keeping and fitting of experimentally measured charge-changing and ionization cross sections of hydrogen and helium particles in a water gas are discussed, with emphasis on the low-energy/low-velocity range that is characteristic of solar wind bulk speeds (<20 keV u−1/2000 km s−1). Results. We provide polynomial fits for cross sections of charge-changing and ionization reactions, and list the experimental needs for future studies. To take into account the energy distribution of the solar wind, we calculated Maxwellian-averaged cross sections and fitted them with bivariate polynomials for solar wind temperatures ranging from 105 to 106 K (12–130 eV). Conclusions. Single- and double-electron captures by He2+ dominate at typical solar wind speeds. Correspondingly, single-electron capture by H+ and single-electron loss by H− dominate at these speeds, resulting in the production of energetic neutral atoms (ENAs). Ionization cross sections all peak at energies above 20 keV and are expected to play a moderate role in the total ion production. However, the effect of solar wind Maxwellian temperatures is found to be maximum for cross sections peaking at higher energies, suggesting that local heating at shock structures in cometary and planetary environments may favor processes previously thought to be negligible. This study is the first part in a series of three on charge exchange and ionization processes at comets, with a specific application to comet 67P/Churyumov-Gerasimenko and the Rosetta mission.

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Section: H + -H 2 Omentioning

confidence: 99%

Solar wind charge exchange in cometary atmospheres

Wedlund

Bodewits

Alho

et al. 2019

A&A

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“…In general, the angle of Faraday rotation is proportional to the optical path length, which can be increased by placing the active medium into a cavity, either a macroscopic one [16] or a microcavity [17][18][19]. Another method to increase the spectroscopic sensitivity is to increase the probe intensity sent through the sample while keeping the photon flux incident on the photodetector at a low level by diminishing the light intensity using a high polarization extinction (HPE) geometry [20].…”

Section: Introductionmentioning

confidence: 99%

Increased sensitivity of spin noise spectroscopy using homodyne detection in n -doped GaAs

et al. 2018

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We implement the homodyne detection scheme for an increase of the polarimetric sensitivity in spin noise spectroscopy. Controlling the laser intensity of the local oscillator, which is guided around the sample and does not perturb the measured spin system, we are able to improve the signal-to-noise ratio. The opportunity of additional amplification of the measured signal strength allows us to reduce the probe laser intensity incident onto the sample and therefore to approach the non-perturbative regime. The efficiency of this scheme with signal enhancement by more than a factor of 3 at low probe powers is demonstrated on bulk -doped GaAs where the reduced electron-spin relaxation rate is shown experimentally. Additionally, the control of the optical phase provides us with the possibility to switch between the measurement of Faraday rotation and ellipticity without changes in the optical setup.

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Noise spectroscopy of an optical microresonator

Cited by 2 publications

References 13 publications

Solar wind charge exchange in cometary atmospheres

Solar wind charge exchange in cometary atmospheres

Increased sensitivity of spin noise spectroscopy using homodyne detection in n -doped GaAs

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