18W ultra-narrow diode laser absolutely locked to the Rb D<sub>2</sub> line

Tang, Hao; Zhao, Huizi; Wang, Rui; Li, Liang; Yang, Zining; Wang, Hongyan; Yang, Weiping; Han, Kai; Xu, Xiaojun

doi:10.1364/oe.442523

Cited by 12 publications

(10 citation statements)

References 37 publications

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“…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

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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Section: Narrowband Atomic Line Filtersmentioning

confidence: 99%

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

et al. 2022

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“…Ultra narrowband magneto-optical filters [27], which rely on complex refractive indices, are perfect candidates for non-Hermitian physics but have not yet been studied in this domain. Magneto-optical filters already see many applications in solar weather studies [28][29][30], laser frequency stabilization [31][32][33][34][35], LIDAR, [36][37][38], quantum hybrid systems [39], underwater optical communications [40] and ghost imaging [41]. Optimizing filters is a balance between maximizing transmission and minimizing bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Exploiting non-orthogonal eigenmodes in a non-Hermitian optical system to realize sub-100 MHz magneto-optical filters.

Logue¹,

Briscoe²,

Pizzey³

et al. 2023

Preprint

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Non-Hermitian physics is responsible for many of the counter-intuitive effects observed in optics research opening up new possibilities in sensing, polarization control and measurement. A hallmark of non-Hermitian matrices is the possibility of non-orthogonal eigenvectors resulting in coupling between modes. The advantages of propagation mode coupling have been little explored in magneto-optical filters and other devices based on birefringence. Magneto-optical filters select for ultra-narrow transmission regions by passing light through an atomic medium in the presence of a magnetic field. Passive filter designs have traditionally been limited by Doppler broadening of thermal vapors. Even for filter designs incorporating a pump laser, transmissions are typically less than 15% for sub-Doppler features. Here we exploit our understanding of non-Hermitian physics to induce non-orthogonal propagation modes in a vapor and realize better magneto-optical filters. We construct two new filter designs with ENBWs and maximum transmissions of 181 MHz, 42 % and 140 MHz, 17% which are the highest figure of merit and first sub-100 MHz FWHM passive filters recorded respectively. This work opens up a range of new filter applications including metrological devices for use outside a lab setting and commends filtering as a new candidate for deeper exploration of non-Hermitian physics such as exceptional points of degeneracy.

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“…Atomic filters are employed in an ever-growing range of applications, including single photon filtering [31,32], atmospheric lidar [33,34], designing frequency-selective lasers [35][36][37][38], ghost imaging [39], and optical communication [40,41]. In solar physics studies, filters are realised by cascading light through multiple thermal vapour cells [42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Voigt transmission windows in optically thick atomic vapours: a method to create single-peaked line centre filters

Briscoe

Logue

Pizzey

et al. 2023

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

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Cascading light through two thermal vapour cells has been shown to improve the performance of atomic filters that aim to maximise peak transmission over a minimised bandpass window. In this paper, we explore the atomic physics responsible for the operation of the second cell, which is situated in a transverse (Voigt) magnetic field and opens a narrow transmission window in an optically thick atomic vapour. By assuming transitions with Gaussian line shapes and magnetic fields sufficiently large to access the hyperfine Paschen-Back regime, the window is modelled by resolving the two transitions closest to line centre. We discuss the validity of this model and perform an experiment which demonstrates the evolution of a naturally abundant Rb transmission window as a function of magnetic field. The model results in a significant reduction in two-cell parameter space, which we use to find theoretical optimised cascaded line centre filters for Na, K, Rb and Cs across both D lines. With the exception of Cs, these all have a better figure of merit than comparable single cell filters in literature. Most noteworthy is a Rb-D2 filter which outputs 92% of light through a single peak at line centre, with maximum transmission 0.71 and a width of 330 MHz at half maximum.

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18W ultra-narrow diode laser absolutely locked to the Rb D₂ line

Cited by 12 publications

References 37 publications

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

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

Exploiting non-orthogonal eigenmodes in a non-Hermitian optical system to realize sub-100 MHz magneto-optical filters.

Voigt transmission windows in optically thick atomic vapours: a method to create single-peaked line centre filters

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18W ultra-narrow diode laser absolutely locked to the Rb D2 line

Cited by 12 publications

References 37 publications

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

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

Exploiting non-orthogonal eigenmodes in a non-Hermitian optical system to realize sub-100 MHz magneto-optical filters.

Voigt transmission windows in optically thick atomic vapours: a method to create single-peaked line centre filters

Contact Info

Product

Resources

About

18W ultra-narrow diode laser absolutely locked to the Rb D₂ line