Helium spectroscopy using an InGaAs laser diode

Bohler, C. L.; Marton, B.

doi:10.1364/ol.19.001346

Cited by 23 publications

(7 citation statements)

References 11 publications

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“…where D is deuterium, T is tritium, 4 He is the mass 4 isotope of helium, and n is a neutron. The ion source produces either deuterium or tritium ions while the target contains the opposite atom.…”

Section: Overview Of Problemmentioning

confidence: 99%

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Summary of Sandia research on metal tritides : FY 2007.

Browning

Kammler²,

Snow³

et al. 2008

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Sandia National Laboratories has cradle to grave responsibility for all neutron generators in the US nuclear weapons stockpile. As such, much research effort is exerted to develop a comprehensive understanding of all the major components of a neutron generator. One of the key components is the tritium containing target. The target is a thin metal tritide film. Sandia's research into metal tritides began in the early 1960's with a collaboration with the 3 Denver Research Institute (DRI) and continues to this day with a major in house research effort.This document is an attempt to briefly summarize what is known about the aging of erbium tritide and to review the major publications conducted at Sandia in FY 07. First, a review of our knowledge of helium in erbium tritide will be presented. Second, executive summaries of the six major SAND reports regarding neutron tube targets published in FY07 by Department 2735, the Applied Science and Technology Maturation Department, and research partners are presented. 4 AcknowledgmentOver the past five years a major demographic change has occurred amongst the researchers responsible for the science and technology of neutron generators. The seasoned researchers have given way to a newer generation. This work would not have been possible without the effort of the earlier generation who exhibited tremendous insight and technical capabilities. Their measurements and work form the basis of what we are trying to accomplish. Of necessity the early work was phenomenological, simply attempting to categorize the nature and magnitude of the effects of tritium in metals. With this understanding in place and with modern characterization techniques we are now able to begin unraveling the fundamental physics and chemistry of this complex field. We dedicate this work to them, the pioneers of metal tritide science.

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Section: Overview Of Problemmentioning

confidence: 99%

“…2.5 for 4 He, the allowed transitions from the 2 3 S 0 to the three 2 3 P J states. [4] The situation gets a bit more complicated when 3 He is considered. The nuclear magnetic moment, I, is 1/2 for 3 He and 0 for 4 He.…”

Section: Optical Detection Of 3 Hementioning

confidence: 99%

Summary of Sandia research on metal tritides : FY 2007.

Browning

Kammler²,

Snow³

et al. 2008

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“…Both these obstacles were circumvented recently by using diode laser pumping [14]. A commercially available diode with an inner Bragg-reflection resonator adjusted to the D 0 -line (1083.03 nm) takes about 1-3 min to saturate the nuclear polarization of 3 He.…”

Section: Free-precession 3 He-opmmentioning

confidence: 99%

Recent Progress in Optically Pumped Magnetometers

Alexandrov

2003

Physica Scripta

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Optically pumped magnetometres (OPM) are known as the most precise instruments for scalar measurement of low magnetic fields, including those of the Earth's magnetic field. For a long time OPM could not compete, in absolute accuracy, with the proton precession magnetometers, being, at the same time, much more sensitive and fast. Nowadays, due to the considerable progress in the OPM performance, several types of OPM became much more accurate than the best proton magnetometer. During the last decade the main progress was associated with OPM of the following three types: (1) The narrow-line potassium M x -OMP with the highest shot-noise-limited resolution (about 10 fT=Hz 1=2 ) and with an absolute accuracy better than 0.1 nT; (2) The ''tandem'' M x -M z -type magnetometer with a narrow line potassium M z unit of enhanced absolute accuracy (of about 10 pT); (3) The laser pumped 3 He freeprecession magnetometer of highest absolute accuracy and lowest energy consumption. Each of these three types has its own specific features, preferable in certain applications.

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“…In particular, 1083 nm laser has important applications in nonlinear frequency conversion, atomic and molecular spectroscopy efficiently [1][2][3][4][5]. For example, such laser has been used to study the multiplet of the helium (He) atom to improve measurement precision for the fine structure constant [6,7]; In addition, using this naturally occurring metastable state of He, the upper neutral atmosphere from 300 to 1000 km can be actively probed with a resonance fluorescence Doppler wind/temperature lidar operating at 1083 nm [8,9].…”

Section: Introductionmentioning

confidence: 99%

High OSNR watt-level single-frequency one-stage PM-MOPA fiber laser at 1083 nm

Yang¹,

Xu²,

Yang³

et al. 2014

Opt. Express

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A 1.03 W optical signal-to-noise ratio (OSNR) of > 70 dB single-frequency polarization-maintained master-oscillator power amplifier (PM-MOPA) laser at 1083 nm was demonstrated. The seed laser of this laser system was a distributed Bragg reflector short cavity Yb-doped phosphate fiber oscillator. A one-stage core-pumped amplification configuration was employed, in which the typical gain is 9.7 dB and the optical-to-optical conversion efficiency is 68.7%. The estimated laser linewidth is less than 3.5 kHz, the measured polarization-extinction ratio is greater than 25 dB, and the obtained relative intensity noise of fiber laser for frequencies of over 2 MHz is less than -130 dB/Hz.

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Helium spectroscopy using an InGaAs laser diode

Cited by 23 publications

References 11 publications

Summary of Sandia research on metal tritides : FY 2007.

Summary of Sandia research on metal tritides : FY 2007.

Recent Progress in Optically Pumped Magnetometers

High OSNR watt-level single-frequency one-stage PM-MOPA fiber laser at 1083 nm

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