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Claude Cohen-Tannoudji developed methods for controlling atomic internal states and motion with light. With Jean Dalibard, he explained how polarization gradients produce laser cooling below the simple Doppler cooling limit.
The essential link is between a spatially changing atomic light shift and state-changing optical pumping. The pumping delays let moving chemical atoms lose kinetic energy through repeated transitions between different light-shift potentials. This supplied a microscopic explanation for unexpectedly low experimental temperatures.[ref]
Portrait of Claude Cohen-Tannoudji
. Amir Bernat; existing Commons crop by Wabbuh. Creative Commons Attribution-ShareAlike 4.0 International selected from the offered multiple licenses; no need to choose GFDL or an older CC license., via Wikimedia Commons. Source.Jean Dalibard developed, with Claude Cohen-Tannoudji, models explaining laser cooling below the simple Doppler cooling limit. Spatially changing wave polarization makes the light shifts of atomic sublevels vary with position.
In Sisyphus cooling, moving chemical atoms climb a light-shift potential and are optically pumped into a lower-energy sublevel. Repeating that sequence removes kinetic energy. The mechanism depends on internal-state structure and optical pumping, explaining why a two-level Doppler model misses the additional cooling.[ref]
Portrait of Jean Dalibard
. © Barande Jérémy /EP. (Ecole polytechnique). CC BY-SA 2.0, via Wikimedia Commons. Source.Frederick Reines co-developed a coincidence method for detecting reactor electron antineutrinos. A prompt Positron signal followed by delayed neutron capture made an otherwise rare interaction recognizable. Calibration sources tested the response, while reactor-off data and changes to the capture conditions tested backgrounds. The result demonstrates why identifying a particle requires a reproducible pattern of observables and controls, rather than an unexplained excess of detector counts.[ref]
Detection of the Free Neutrino: a Confirmation by Clyde Cowan and others. 1956, prompt/delayed signals, calibrations, reactor comparisons and neutron-capture controls
A physicist and founding dean at the University of California, Irvine.[ref]
A Message from the Chair by Manoj Kaplinghat. Independent professional identity
Portrait of Frederick Reines
. US Department of Energy; source Fermilab (fnal.gov); existing Commons contrast adjustment by Hohum. Public domain in the United States (US Department of Energy employee work). Source usage terms, via Wikimedia Commons. Source.Clyde Cowan and Frederick Reines detected reactor electron antineutrinos through inverse beta decay, . The Positron supplied a prompt annihilation signal; capture of the neutron supplied a delayed signal. Requiring this pair and comparing operation at different reactor powers separated the weak interaction signature from background. Their 1956 report tested both the timing and physical origin of the signals, including changes to the neutron-capture material.[ref]
Detection of the Free Neutrino: a Confirmation by Clyde Cowan and others. 1956, reaction, prompt/delayed coincidence, reactor dependence and cadmium checks
A physicist who taught at the Catholic University of America from 1958 to 1974.[ref]
History by Catholic University of America Department of Physics. Independent professional identity
Portrait of Clyde Cowan
. US Army. Public domain in the United States (U.S. Army work). Source usage terms, via Wikimedia Commons. Source.Manoj Kaplinghat studies connections between particle, dark matter and astronomical structure. The research programme described by his institution uses gravitational lensing and stellar motions to investigate matter distributions in galaxies and clusters.[ref]
Dark matter, Gravitational lensing by University of California, Irvine. Research description: lensing, dwarf-galaxy kinematics and particle properties
These measurements connect microscopic matter models with macroscopic dynamics. Inferring a particle's properties requires more than estimating total mass: the spatial distribution, velocities and possible interactions must also be consistent with the observations.
An experimental condensed matter physicist who coauthored the discovery experiments on low-temperature phases of helium-3. Measurements in a Pomeranchuk cell revealed changes in the nuclear magnetic resonance signal at millikelvin temperatures, linking unusual pressure behavior to changes in the liquid's magnetic response. The observations supplied independent probes of the new quantum phases.[ref]
New Magnetic Phenomena in Liquid He3 below 3 mK by Douglas Dean Osheroff and others. Abstract: Pomeranchuk cell, frequency shift and absorption change
An experimental atomic physicist who led a report of laser cooling below the Doppler cooling limit. Several ballistic-motion measurements checked the temperature of sodium released from optical molasses, establishing an unexpected failure of the simple cooling model.[ref]
An experimental physicist who coauthored measurements of sodium released from optical molasses. Their temperature was substantially below the conventional Doppler cooling limit, giving experiments a concrete reason to seek additional laser cooling mechanisms.[ref]
An experimental atomic physicist who coauthored the 1988 sub-Doppler cooling observation in optical molasses. Tracking chemical atoms after release linked their ballistic motion to the velocity spread and hence to temperature.[ref]
Observation of Atoms Laser Cooled below the Doppler Limit by Paul D. Lett and others. Abstract: ballistic motion as thermometry
An experimental physicist who coauthored a study finding sodium chemical atoms colder than the Doppler cooling limit. Complementary measurements of free expansion checked that the low inferred temperature was a physical result.[ref]
Observation of Atoms Laser Cooled below the Doppler Limit by Paul D. Lett and others. Abstract: complementary ballistic measurements
An experimental atomic physicist who coauthored a 1988 observation of sodium cooled below the Doppler cooling limit. The result exposed the limitations of a simple Doppler cooling description of optical molasses.[ref]
A theoretical particle physicist who, with Gerardus 't Hooft, developed a consistent procedure for regularization and renormalization of gauge theories. Their 1972 paper handles divergent loop calculations while preserving the identities needed for gauge consistency in nonanomalous cases. This made higher-order predictions in theories such as the electroweak interaction calculable rather than formally infinite.[ref]
Regularization and renormalization of gauge fields by Gerardus 't Hooft and Martinus Justinus Godefridus Veltman. Abstract and introduction: overlapping divergences, Ward identities and arbitrary perturbative order
Herbert Kroemer developed semiconductor-device designs that use changes of material composition to control carrier motion. A heterojunction introduces band offsets, while a graded band edge can create a quasielectric force on carriers. The resulting design language goes beyond treating every device region as the same material under a different voltage. In double heterostructures, carrier confinement and optical guiding can concentrate recombination in a useful active region, enabling improved semiconductor light sources.[ref]
Nobel Lecture: Quasielectric fields and band offsets: teaching electrons new tricks by Herbert Kroemer. Reviews of Modern Physics 73, 783 (2001), band offsets, graded composition and heterostructure devices
A physicist who studied semiconductor devices at Santa Barbara.[ref]
Professional profile of Herbert Kroemer. Independent professional identity
Portrait of Herbert Kroemer
. Javier Chagoya, Naval Postgraduate School, 24 October 2008; existing Commons crop by TDKR Chicago 101. Public domain in the United States (US federal government work). Source usage terms, via Wikimedia Commons. Source.A physicist who helped achieve continuous operation of semiconductor lasers at room temperature. A double heterostructure surrounded a thin active layer with different semiconductor layers, reducing the current needed to sustain lasing. This addressed a practical obstacle in early devices and helped make laser diodes useful for optical communication and other technologies.[ref]
https://www.kyotoprize.org/en/laureates/izuo_hayashi/. Achievement digest and citation: 1970 continuous operation and double-heterostructure confinement
Robert Noyce devised a semiconductor device structure that integrates electrical connections with the semiconductor surface. His patent places conducting paths over an insulating layer and connects them to selected regions through openings in that layer. This makes interconnection part of fabrication rather than requiring every connection to be a separate external wire. The design connects surface insulation, device junctions and patterned conductors in the development of the integrated circuit.[ref]
Semiconductor device-and-lead structure by Robert Noyce. US2981877A, surface insulating layer, contact openings and deposited conducting leads
Portrait of Robert Noyce
. Intel Free Press; existing Commons crop by Wabbuh. CC BY-SA 2.0, via Wikimedia Commons. Source.A semiconductor physicist who devised the planar process for manufacturing semiconductor devices. His patent uses an insulating surface coating while forming and protecting device junctions, making surface treatment part of reliable fabrication. This links the chemistry of a semiconductor surface to the repeatability and integration of electronic components.[ref]
Method of manufacturing semiconductor devices by Jean Hoerni. Patent description and claims: coated wafer, junction formation and device protection
A physicist who helped develop photolithography for manufacturing small semiconductor devices. His oral history describes adapting photographic reduction and light-sensitive coatings to pattern transistors, motivated by the need to fit circuits into a restricted space. Transferring a reduced pattern to the device surface made reproducible small features possible and linked optical imaging with semiconductor fabrication.[ref]
Oral History of Jay W. Lathrop. pp. 4–6 and 8–9: photographic reduction, light-sensitive resist, masks and transistor fabrication
Masatoshi Koshiba helped turn underground neutrino detectors into astronomical instruments. The Kamiokande II report of the 1987 supernova burst described eleven electron-like events over about thirteen seconds. These rare interactions supplied information about the collapsing star through weakly interacting particles rather than only its escaping light. The observation joined the timing and energy measurements of particle detection with a transient event far outside the solar system.[ref]
Portrait of Masatoshi Koshiba
. Source. An experimental physicist who contributed to the 1962 rocket experiment reported with Riccardo Giacconi, Herbert Gursky and Bruno Benedetto Rossi. The payload used large-area Geiger counters with thin mica windows to detect soft X-rays; surrounding scintillation counters rejected charged-particle background. As the rocket rotated, the detectors scanned the sky and found a strong directional excess. The result supplied early evidence for X-ray sources outside the Solar system.[ref]
Evidence for x Rays From Sources Outside the Solar System by Riccardo Giacconi and others. Printed pp. 439–440: detector windows, anticoincidence shielding, sky scan and count-rate peak
An experimental physicist whose thin-film measurements helped motivate the theory of type-II superconductors. After changing the deposition procedure on Alexander Shalnikov's advice, Zavaritskii found critical-field behavior that differed from the familiar limiting case of Ginzburg-Landau theory. Discussion with Alexei Alexeyevich Abrikosov led to examining a different material-parameter regime, connecting a troublesome experiment with a new class of superconducting behavior.[ref]
Nobel Lecture: Type-II superconductors and the vortex lattice by Alexei Alexeyevich Abrikosov. p. 975: thin-film experiments, revised preparation and interpretation in a different parameter regime
Pinned article: Introduction to the OurBigBook Project
Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
Intro to OurBigBook
. Source. We have two killer features:
- topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculusArticles of different users are sorted by upvote within each article page. This feature is a bit like:
- a Wikipedia where each user can have their own version of each article
- a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.Figure 1. Screenshot of the "Derivative" topic page. View it live at: ourbigbook.com/go/topic/derivativeVideo 2. OurBigBook Web topics demo. Source. - local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
Figure 2. You can publish local OurBigBook lightweight markup files to either OurBigBook.com or as a static website.Figure 3. Visual Studio Code extension installation.Figure 5. . You can also edit articles on the Web editor without installing anything locally. Video 3. Edit locally and publish demo. Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension. - Infinitely deep tables of contents:
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact
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