Tunable dye lasers and atomic spectroscopy

Corney, Alan

doi:10.1093/acprof:oso/9780199211456.003.0014

Cited by 9 publications

(14 citation statements)

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“…The absorption of circularly polarised light creates a non-uniform distribution between the now degenerate m F states, with the result that there will be magnetisation M x in the x-direction. The presence of a small transverse field B ⊥ leads to a situation referred to as transverse optical pumping [10]. Following the argument presented in [10], as a Rb atom acquires a magnetic dipole moment in the x-direction it will begin to precess in a plane perpendicular to B ⊥ away from the x-direction, in the process decreasing in magnitude due to relaxation effects.…”

Section: Discussionmentioning

confidence: 99%

The zero-field resonance in optical pumping experiments

James¹,

Tango²

2020

Eur. J. Phys.

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It is common for senior physics students at many universities to perform optical pumping experiments using a rubidium cell in an integrated apparatus. Such experiments provide an encounter with atomic structure in the context of a standard technique of modern atomic physics. Typically, students investigate radiofrequency resonances between Zeeman levels and measure hyperfine splitting. Despite its pivotal role in aligning the apparatus the so-called zero-field resonance is usually not investigated in such experiments. However it is instructive to look more closely at this phenomenon. We show that it is a consequence of a residual transverse magnetic field that is the result of the inability to align precisely the optical axis of the apparatus in the local N–S direction. The measured width and depth of the resonance-like minimum in transmission is found to be consistent with a very small relaxation rate for the rubidium atoms. In an appendix we show further that the measurements compare well with theory for the Hanle effect in the ground state for an arbitrary magnetic field direction relative to the optical axis of the experiment.

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Section: Discussionmentioning

confidence: 99%

The zero-field resonance in optical pumping experiments

James¹,

Tango²

2020

Eur. J. Phys.

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“…where e is the charge of the oscillating electron within dielectric material atoms, m is the mass of the oscillating electron, and B is the magnetic flux density. Empirically, the magneto-optical angle of rotation φ (in min) can be given in terms of the refractive indices of the polarized light components (n + , n − ), the speed of light c, the magnetic flux density B, and the frequency of transmitted light ω as [1,2]…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The Faraday rotation and the determination of the Verdet constant is a fundamental experiment in many undergraduate labs in physics and chemistry as it combines the main principles of optics and electromagnetism [1,2]. The Faraday rotation is defined as the rotation in plane of polarization of light passing through a transparent isotropic sample in the presence of an external longitudinal magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the Verdet constant is an optical property, named after the French physicist Émile Verdet which describes the strength of the magneto-optical effect for a particular material. Historically, it has been long proven that when transparent materials are placed in a strong uniform magnetic field, and a beam of linearly polarized light is passed coaxially and parallel with the direction of magnetic field lines, a significant rotation in transmitted light polarization is observed [1][2][3][4][5][6]. This magneto-optical rotation is commonly known as 'Faraday rotation', which is attributed to Michael Faraday's landmark observation in 1845 when he noticed the direct interaction between light polarization and magnetic field strength.…”

Section: Introductionmentioning

confidence: 99%

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Verdet constant determination of dielectric media using a new versatile, portable and low-cost magneto-optical rotator

Al-Basheer¹

2020

Eur. J. Phys.

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The full details of a newly developed versatile, portable and low-cost magneto-optical device for the accurate determination of Verdet constant over the wavelength range of 400–480 nm in undergraduate physics and chemistry labs are presented. The elevated sensitivity of the device is achieved by using a semiconducting photodiode detector coupled with an electronic circuit board, which is configured to autonomously record the finest rotation angle in the polarization direction of the transmitted light relative to a reference polarizer. Two different mechanisms to generate a strong coaxial magnetic field of ∼1.34 T are presented, using either a ring neodymium permanent magnet or a solenoid fed by a lithium-ion battery cell. Due to its versatility, portability and low-cost, the presented device is expected to replace most currently existing bulky and expensive setups.

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“…In order to measure the magnetic field experienced by the 87 Rb atoms, we detect the ground-state hyperfine splitting between two magneto-related Zeeman states using a CPT resonance. According to the Breit-Rabi formula, [22] the energy difference between two hyperfine Zeeman states in the F g = 1 and F g = 2 influenced by small magnetic field can be expressed approximately as…”

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confidence: 99%

High contrast atomic magnetometer based on coherent population trapping

Ai-Lin¹,

Yang²,

Xu³

et al. 2014

Chinese Phys. B

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We present an experimental and theoretical investigation of the coherent population trapping (CPT) resonance excited on the D1 line of 87 Rb atoms by bichromatic linearly polarized laser light. The experimental results show that a lin‖lin transition scheme is a promising alternative to the conventional circular-circular transition scheme for an atomic magnetometer. Compared with the circular light transition scheme, linear light accounts for high-contrast transmission resonances, which makes this excitation scheme promising for high-sensitivity magnetometers. We also use linear light and circular light to detect changes of a standard magnetic field, separately.

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Tunable dye lasers and atomic spectroscopy

Cited by 9 publications

References 0 publications

The zero-field resonance in optical pumping experiments

The zero-field resonance in optical pumping experiments

Verdet constant determination of dielectric media using a new versatile, portable and low-cost magneto-optical rotator

High contrast atomic magnetometer based on coherent population trapping

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