scholarly journals Magnetic field‐switchable Laser Via Optical Pumping of Rubrene

2021 ◽  
pp. 2103870
Author(s):  
Collin F. Perkinson ◽  
Markus Einzinger ◽  
Joseph Finley ◽  
Moungi G. Bawendi ◽  
Marc A. Baldo
Keyword(s):  
Magnetic Field ◽  
Optical Pumping

SOME RESULTS OF AEROMAGNETIC SURVEYING WITH A DIGITAL CESIUM‐VAPOR MAGNETOMETER

Geophysics ◽  
1965 ◽  
Vol 30 (5) ◽  
pp. 883-890 ◽  
Author(s):  
Raoul I. Giret
Keyword(s):  
Magnetic Field ◽  
Optical Pumping ◽  
Digital Data ◽  
Cesium Vapor ◽  
Ground Station ◽  
Digital Frequency ◽  
Record Data ◽  
Frequency Meter ◽  
Magnetic Record ◽  
The Magnetic Field

This magnetometer has been developed by C.S.F. (Compagnie Générale de Télégraphie Sans Fil) and C.G.G. (Compagnie Générale de Géophysique). The magnetic field is measured by an optical pumping sensor giving a frequency proportional to the field. A digital frequency‐meter delivers a reading each second with a sensitivity of ± one period (31.5 periods for one gamma). These readings are recorded on a magnetic tape recorder and on an analog TEXAS recorder. The digital data are processed on a 1620 IBM. During the flight a second magnetometer records the variation of the earth’s field in a ground station located in the center of the area surveyed. The ground record data are subtracted from the airborne data. The following data obtained with this equipment are presented: Analog record with a sensitivity of one gamma for two mm. Restitution with 1620 IBM and CALCOMP of the magnetic record to an analog record with a sensitivity of one gamma for one cm. Isogam maps with a contour interval of one gamma and some intermediate contours at 0.5 gamma.

Improved design of a frequency-shifted feedback diode laser for optical pumping at high magnetic field

1998 ◽  
Vol 147 (1-3) ◽  
pp. 99-102 ◽  
Author(s):  
M.J Lim ◽  
C.I Sukenik ◽  
T.H Stievater ◽  
P.H Bucksbaum ◽  
R.S Conti
Keyword(s):  
Magnetic Field ◽  
Diode Laser ◽  
High Magnetic Field ◽  
Optical Pumping ◽  
Improved Design

scholarly journals Measurement of Asymmetric Optical Pumping of Ions Accelerating in a Magnetic-Field Gradient

2004 ◽  
Vol 93 (23) ◽  
Author(s):  
Xuan Sun ◽  
Earl Scime ◽  
Mahmood Miah ◽  
Samuel Cohen ◽  
Frederick Skiff
Keyword(s):  
Magnetic Field ◽  
Field Gradient ◽  
Optical Pumping ◽  
Magnetic Field Gradient

First measurements of the Mesospheric Magnetic Field in the Auroral Zone by means of laser

2020 ◽  
Author(s):  
Magnar G. Johnsen ◽  
Njål Gulbrandsen ◽  
Paul Hillman ◽  
Craig Denman ◽  
Jürgen Matzka ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Time Scales ◽  
Optical Pumping ◽  
Sodium Atom ◽  
Auroral Zone ◽  
Geomagnetic Variations ◽  
Sum Frequency ◽  
Sodium Layer ◽  
Magnetic Field Magnitude ◽  
The Magnetic Field

<p>In December 2019, for the first time, we were able to remotely measure the magnetic field in the mesospheric sodium layer, in the auroral zone.</p><p>By means of laser optical pumping and Larmor-resonance detection, it is possible to use the naturally occurring sodium layer in the mesosphere to measure Earth’s magnetic field magnitude at 90 km above ground. This is an altitude otherwise only accessible by rockets, which only will provide point measurements of very short time scales.</p><p>During the winter of 2019-20 we have applied a cw sum-frequency fasor/laser for probing the sodium-atom Larmor resonance at the Artic Lidar Observatory for Mesospheric Research (ALOMAR) at Andøya in northern Norway in order to measure and monitor the magnetic field in situ in the high latitude mesosphere over longer time scales.</p><p>The technique, which has been proved earlier at mid-latitudes, has now been confirmed and applied to high latitudes in the auroral zone during disturbed auroral and geomagnetic conditions. The magnetic field in the auroral zone is close to vertical making our measurements a notable achievement since the beam is closer to parallel with the magnetic field, contary to earlier measurements being closer to perpendicular as shown as best by theory.</p><p>This opens up for a completely new domain of measurements of externally generated geomagnetic variations related to currents in the magnetosphere-ionosphere system.</p><p>Here we report on the instrumental setup, and discuss our measurements of the mesospheric magnetic field.</p>

SELECTIVE AMPLIFICATION OF NARROW RESONANCE FORMED IN TRANSMISSION SPECTRUM OF Rb NANO-CELL IN MAGNETIC FIELD

2012 ◽  
Vol 15 ◽  
pp. 9-15
Author(s):  
A. SARGSYAN ◽  
G. HAKHUMYAN ◽  
R. MIRZOYAN ◽  
A. PAPOYAN ◽  
D. SARKISYAN ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetic Fields ◽  
Transmission Spectrum ◽  
Optical Pumping ◽  
Atomic Transition ◽  
New Method ◽  
Narrow Resonance ◽  
Selective Amplification ◽  
Resonant Transmission

Recently it was shown that "λ-Zeeman Technique" (λ-ZT) is a convenient tool to study individual transitions between the Zeeman sublevels of hyperfine levels in an external magnetic field. λ-ZT is based on resonant transmission spectrum of nanometric thin cell (NTC) of thickness L = λ, where λ is the resonant wavelength 794 nm for Rb D1 line. Narrow velocity selective optical pumping (VSOP) resonances in the transmission spectrum of the NTC are split into several components in a magnetic field. Examination of VSOP resonances allows one to identify and investigate an atomic transition in the range of magnetic fields 10 - 5000 G. Here we present a new method for selective addressing of VSOP resonance amplification (more than 10 times).

Metastability exchange optical pumping of 3He at high pressure and high magnetic field for medical applications

2007 ◽  
Vol 144 (1) ◽  
pp. 255-263 ◽  
Author(s):  
A. Nikiel ◽  
T. Palasz ◽  
M. Suchanek ◽  
M. Abboud ◽  
A. Sinatra ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Pressure ◽  
High Magnetic Field ◽  
Optical Pumping ◽  
Medical Applications

Optical Pumping and Optical Detection of Spin-Polarized Electrons in a Conduction Band

1971 ◽  
Vol 49 (14) ◽  
pp. 1850-1860 ◽  
Author(s):  
R. R. Parsons
Keyword(s):  
Magnetic Field ◽  
Conduction Band ◽  
Spin Polarization ◽  
Optical Pumping ◽  
Polarized Light ◽  
Degree Of Polarization ◽  
Polarized Electrons ◽  
Excitation Light ◽  
Circularly Polarized Light ◽  
Spin Polarized

Spin-polarized electrons are created in the conduction band of p-type GaSb by excitation with σ+ or σ− circularly polarized light. The degree of polarization of the photoluminescence is used to measure the optically pumped spin polarization. The measurements as a function of transverse magnetic field yield the spin-relaxation time and the lifetime of the photocreated electrons. The degree of polarization oscillates as a function of the photon energy of the excitation light. This effect is associated with mechanisms of rapid energy loss involving optical and acoustical phonons. The optical pumping is studied as a function of temperature in the range 3.5 °K ≤ T ≤ 11 °K. A maximum spin polarization [Formula: see text] is obtained at [Formula: see text]. The efficiency of the optical pumping is significantly increased with the application of a weak longitudinal magnetic field.

scholarly journals Полностью оптический магнитометрический датчик для задач магнитоэнцефалографии и томографии сверхслабого поля

2020 ◽  
Vol 46 (17) ◽  
pp. 43
Author(s):  
А.К. Вершовский ◽  
А.С. Пазгалев ◽  
М.В. Петренко
Keyword(s):  
Magnetic Field ◽  
Magnetic Resonance ◽  
Shot Noise ◽  
Magnetic Moment ◽  
Resonance Line ◽  
Optical Pumping ◽  
Resonance Excitation ◽  
A Cell ◽  
Resonance Line Width ◽  
The Magnetic Field

A version of the scheme of an atomic cesium vapour magnetometric sensor using magnetic resonance excitation by modulated radiation transverse to the magnetic field of hyperfine optical pumping is proposed and experimentally studied. It is shown that when using a cell with a volume of 0.125 cm3, the variational sensitivity of the sensor, estimated from the ratio of the steepness of the signal at the center of the magnetic resonance to the shot noise of the detecting radiation, reaches a level of less than 10 fT/Hz1/2 in the frequency band determined by the magnetic resonance line width (of the order of 800 Hz). The sensor, which does not use and does not emit resonant radio-frequency fields, is designed to operate in magnetoencephalographic complexes. Possible ways to increase the frequency response of the circuit for detecting relatively fast (~ 4.2 kHz in a field of 0.1 mT) proton magnetic moment precession signals in promising ultralow field tomography schemes are considered.

Sign in / Sign up

Export Citation Format

Share Document