Diffraction-limited Fabry–Perot cavity in the near concentric regime

Durak, Kadir; Nguyen, Chi Huan; Leong, Victor; Straupe, S. S.; Kurtsiefer, Christian

doi:10.1088/1367-2630/16/10/103002

Cited by 21 publications

(16 citation statements)

References 26 publications

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“…Unfortunately, these systems are experimentally demanding due to the need of ultra-high-reflectivity coatings and sophisticated techniques to trap single atoms in these short cavities. However, the notion that short cavities with high finesse are inevitable has been challenged by efforts to use a particular cavity geometry, a (near-)concentric cavity, to implement cavity QED with long cavities of low finesse [6][7][8][9][10][11][12][13]. A cavity is concentric when the separation of the two mirrors l cav matches twice the radius of curvature of the mirrors R C .…”

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Single atoms coupled to a near-concentric cavity

et al. 2017

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Concentric cavities can lead to strong photon-atom coupling without a need for high finesse or small physical-cavity volume. In a proof-of-principle experiment of this concept we demonstrate coupling of single Rb atoms to a 11mm long near-concentric cavity with a finesse F=138(2). Operating the cavity 1.65(1)$\mu$m shorter than the critical length, we observe an atom-cavity coupling constant $g_0=2\pi \times 5.0(2)\,$MHz which exceeds the natural dipole decay rate $\gamma$ by a factor $g_0/\gamma=1.7(1)$.Comment: 5 pages, 4 figure

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Single atoms coupled to a near-concentric cavity

et al. 2017

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“…We use this cavity to achieve strong collective coupling with an outside-vacuum cavity, but another possible future direction could be to use a high-finesse, in-vacuum version to achieve single-atom strong coupling. This approach may be an easier alternative compared to a number of experiments which have sought this limit using extremely small focal length mirrors [31] or concentric cavities [32]. Large mirror separation is especially critical for ions or Rydberg atoms which strongly interact with nearby dielectric surfaces.…”

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confidence: 99%

Increased atom-cavity coupling and stability using a parabolic ring cavity

Cox¹,

Meyer²,

Schine³

et al. 2018

J. Phys. B: At. Mol. Opt. Phys.

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Optical cavities are one of the best ways to increase atom-light coupling and will be a key ingredient for future quantum technologies that rely on light-matter interfaces. We demonstrate that traveling-wave "ring" cavities can achieve a greatly reduced mode waist w, leading to larger atom-cavity coupling strength, relative to conventional standing-wave cavities for given mirror separation and stability. Additionally, ring cavities can achieve arbitrary transverse-mode spacing simultaneously with the large mode-waist reductions. Following these principles, we build a parabolic atom-ring cavity system that achieves strong collective coupling N C = 15(1) between N = 10 3 Rb atoms and a ring cavity with a single-atom cooperativity C that is a factor of 35(5) times greater than what could be achieved with a near-confocal standing-wave cavity with the same mirror separation and finesse. By using parabolic mirrors, we eliminate astigmatism-which can otherwise preclude stable operation-and increase optical access to the atoms. Cavities based on these principles, with enhanced coupling and large mirror separation, will be particularly useful for achieving strong coupling with ions, Rydberg atoms, or other strongly interacting particles, which often have undesirable interactions with nearby surfaces.

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“…A cavity that is stable but that lies parametrically close to the boundary of instability is referred to as a near-unstable cavity (NUC). These devices have found many applications, for example in experiments where a relatively large or small mode volume is required [125,126]. In this work we discuss their application in advanced gravitational-wave detectors.…”

Section: Thermal Noise Reductionmentioning

confidence: 99%

Optical Cavities for Optical Atomic Clocks, Atom Interferometry and Gravitational-Wave Detection

Álvarez

2019

Springer Theses

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A mis hermanas Ángela e Isabel y a mis abuelas Pepita y Consuelo. v Abstract I t is an extremely exciting time for physics. In the last 100 years we have moved from the formulation of Einstein's general relativity to the first direct observation of gravitational waves in late 2015 by the Laser Interferometer Gravitational-wave Observatory (LIGO). Within that time science and technology have come a long way: we have learned to use light to cool atoms to nearly absolute zero temperature, and to use atomic transitions in the microwave and optical regimes to devise the most accurate time and frequency references. We have observed the wave-like behaviour of cold atoms in diffraction experiments using both micro-fabricated structures and the periodic structure of light beams. Exploiting this wave-like behaviour, we have constructed atom interferometers which allow us to test and measure gravity in a new scale. All of these amazing experiments have one thing in common, from LIGO's giant 4 km arms to the transportable atomic clocks sent to space or the atom interferometers that will someday replace current navigation systems, they all make use of a device that has become essential in many areas of science and technology: the Fabry-Perot optical cavity.This thesis delves deeply into the application of optical cavities at the forefront of experimental physics, and it is divided into three parts, each pertaining to a different field where optical cavities are a key technology. Part I of the thesis follows the development of a next-generation, thermal-noise-limited, ultra-stable optical cavity for use as the reference oscillator in optical atomic clocks. This is part of the effort being carried out at the National Physical Laboratory in the UK in the field of precision metrology of time and frequency towards redefining the base SI unit of time, the second, in terms of an optical frequency standard. Part II presents work in the application of optical cavities for enhancing the sensitivity of atom interferometers, with an analysis of multi-photon Bragg diffraction inside an optical cavity. This led to an exploration of the true potential and limitations of the technique. The findings were used to aid the design of the MIGA experiment in France, and design a multi-mirror cavity for enhanced atom interferometry that overcomes some of the limitations of two-mirror cavities. Lastly, Part III presents work towards enhancing current and future laser interferometer gravitational-wave detectors by using near-unstable optical cavities in order to reduce the mirror coating thermal-noise floor, and by modelling parametric oscillatory instabilities that arise in the interferometers from the coupling between the optical field and the mechanical resonances of the test masses. The work carried out during the extent of this PhD, and the variety of contexts, accounts for the relevance and versatility of such an elegant setup as the Fabry-Perot optical cavity is. vii AcknowledgementsThis work was realised with the financial support of the Defen...

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Diffraction-limited Fabry–Perot cavity in the near concentric regime

Cited by 21 publications

References 26 publications

Single atoms coupled to a near-concentric cavity

Single atoms coupled to a near-concentric cavity

Increased atom-cavity coupling and stability using a parabolic ring cavity

Optical Cavities for Optical Atomic Clocks, Atom Interferometry and Gravitational-Wave Detection

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