Dual-beam potassium Voigt filter for atomic line imaging

Kudenov, Michael W.; Pantalone, Brett; Yang, Ruonan

doi:10.1364/ao.393649

“…Examples of the former include filtering of frequency-degenerate photon pairs [213]; filtering of Mollow-triplet sidebands [214]; recording atomic spectra with single-molecule light sources [215]; free-space optical communications [216] and quantum key distribution [217]. Examples of the latter include Faraday lasers [64,[218][219][220][221]; Doppler velocimetry [222]; atmospheric LIDAR [223][224][225][226][227][228]; simultaneous atmospheric wind and temperature measurement [229]; and discerning rocket plumes from sunglints [230]. In addition, the same principle of achieving large optical rotation with minimal absorption in the vicinity of an atomic resonance has been used to realise different photonic devices, such as dichroic beam splitters (BSs) [59,231], and compact OIs [58].…”

Section: Narrowband Atomic Line Filtersmentioning

confidence: 99%

Laser spectroscopy of hot atomic vapours: from ’scope to theoretical fit

Pizzey

¹

,

Briscoe

²

,

Logue

³

et al. 2022

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The spectroscopy of hot atomic vapours is a hot topic. Many of the work-horse techniques of contemporary atomic physics were first demonstrated in hot vapours. Alkali-metal atomic vapours are ideal media for quantum-optics experiments as they combine: a large resonant optical depth; long coherence times; and well-understood atom-atom interactions. These features aid with the simplicity of both the experimental set up and the theoretical framework. The topic attracts much attention as these systems are ideal for studying both fundamental physics and has numerous applications, especially in sensing electromagnetic fields and quantum technology. This tutorial reviews the necessary theory to understand the Doppler broadened absorption spectroscopy of alkali-metal atoms, and explains the data taking and processing necessary to compare theory and experiment. The aim is to provide a gentle introduction to novice scientists starting their studies of the spectroscopy of thermal vapours whilst also calling attention to the application of these ideas in the contemporary literature. In addition, the work of expert practitioners in the field is highlighted, explaining the relevance of three extensively-used software packages that complement the presentation herein.

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“…Some other atom-based imaging techniques employ standard optical methods in combination with atomic-vapour line filters to provide narrow-band transmission and strong out-of-band rejection for imaging at specific wavelengths [28] thereby allowing the signal of interest to be extracted from unwanted background light. Atomic line filters have been used for imaging applications ranging from astronomical solar monitoring [29] and imaging of jet plumes [30] to microscopy for single DNA molecule detection [31].…”

Section: Imaging With Atomsmentioning

confidence: 99%

A practical guide to terahertz imaging using thermal atomic vapour

Downes

¹

,

Torralbo-Campo

²

,

Weatherill

³

2023

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This tutorial aims to provide details on the underlying principles and methodologies of atom-based terahertz imaging techniques. Terahertz imaging is a growing field of research which can provide complementary information to techniques using other regions of the electromagnetic spectrum. Unlike infrared, visible and ultraviolet radiation, terahertz passes through many everyday materials, such as plastics, cloth and card. Compared with images formed using lower frequencies, terahertz images have superior spatial resolution due to the shorter wavelength, while compared to x-rays and gamma rays, terahertz radiation is non-ionising and safe to use. The tutorial begins with the basic principles of terahertz to optical conversion in alkali atoms before discussing how to construct a model to predict the fluorescent spectra of the atoms, on which the imaging method depends. We discuss the practical aspects of constructing an imaging system, including the subsystem specifications. We then review the typical characteristics of the imaging system including spatial resolution, sensitivity and bandwidth. We conclude with a brief discussion of some potential applications.

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“…Some other atom-based imaging techniques employ standard optical methods in combination with atomic-vapour line filters to provide narrow-band transmission and strong out-of-band rejection for imaging at specific wavelengths [29] thereby allowing the signal of interest to be extracted from unwanted background light. Atomic line filters have been used for imaging applications ranging from astronomical solar monitoring [30] and imaging of jet plumes [31] to microscopy for single DNA molecule detection [32].…”

Section: Imaging With Atomsmentioning

confidence: 99%

A practical guide to Terahertz imaging using thermal atomic vapour

Downes¹,

Torralbo-Campo²,

Weatherill³

2022

Preprint

0

View full text Add to dashboard Cite

This tutorial aims to provide details on the underlying principles and methodologies of atom-based terahertz imaging techniques. Terahertz imaging is a growing field of research which can provide complementary information to techniques using other regions of the electromagnetic spectrum. Unlike infrared, visible and ultraviolet radiation, terahertz passes through many everyday materials, such as plastics, cloth and card. Compared with images formed using lower frequencies, terahertz images have superior spatial resolution due to the shorter wavelength, while compared to x-rays and gamma rays, terahertz radiation is non-ionising and safe to use. The tutorial begins with the basic principles of terahertz to optical conversion in alkali atoms before discussing how to construct a model to predict the fluorescent spectra of the atoms, on which the imaging method depends. We discuss the practical aspects of constructing an imaging system, including the subsystem specifications. We then review the typical characteristics of the imaging system including spatial resolution, sensitivity and bandwidth. We conclude with a brief discussion of some potential applications. Introduction. Using Atoms as SensorsAtoms in dilute vapour can make very effective sensors [1,2]. Atoms have no moving parts to wear out, they are relatively unperturbed by inter-atomic interactions, their energy levels are sensitive to applied fields, and crucially, each atom of the same isotope is identical. This final point means that atomic sensors are in effect pre-calibrated and measurements made using them are reproducible and should be, at least in principle, traceable to the SI system of measurements. Atomic systems already provide a platform for precision clocks [3,4], gyroscopes [5,6], magnetometers [7,8], gravimeters [9,10] and gradiometers [11]. Many atom-based sensors achieve optimal performance by using laser-cooling techniques to create very cold atomic samples [12], and although efforts are ongoing to simplify and miniaturise such apparatus [13,14], laser cooling inevitably introduces significant experimental complexity and cost to the setup. In contrast, for atomic sensors where inhomogeneous Doppler broadening is not a problem, setups using

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Dual-beam potassium Voigt filter for atomic line imaging

Cited by 11 publications

References 24 publications

Laser spectroscopy of hot atomic vapours: from ’scope to theoretical fit

Laser spectroscopy of hot atomic vapours: from ’scope to theoretical fit

A practical guide to terahertz imaging using thermal atomic vapour

A practical guide to Terahertz imaging using thermal atomic vapour

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