Laser Spectroscopy Experiments
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Fotonica Ed Elettronica Quantistica
Fotonica ed elettronica quantistica http://www.dsf.unica.it/~fotonica/teaching/fotonica.html Fotonica ed elettronica quantistica Quantum optics - Quantization of electromagnetic field - Statistics of light, photon counting and noise; - HBT and correlation; g1 e g2 coherence; antibunching; single photons - Squeezing - Quantum cryptography - Quantum computer, entanglement and teleportation Light-matter Interaction - Two-level atom - Laser physics - Spectroscopy - Electronics and photonics at the nanometer scale - Cold atoms - Photodetectors - Solar cells http://www.dsf.unica.it/~fotonica/teaching/fotonica.html Energy Temperature LHC at CERN, Higgs, SUSY, ??? TeV 15 q q particle accelerators 10 K q GeV proton rest mass - quarks 1012K MeV electron rest mass / gamma rays 109K keV Nuclear Fusion, x rays, Sun center 106K Atoms ionize - visible light eV Sun surface fundamental components components fundamental room temperature 103K meV Liquid He, superconductors, space 1K dilution refrigerators, quantum Hall µeV laser-cooled atoms 10-3K neV Bose-Einstein condensates 10-6K peV low T record 480 picokelvin 10-9K -12 complexity, organization organization complexity, 10 K Nobel Prizes in Physics 2010 - Andre Geims, Konstantin Novoselov 2009 - Charles K. Kao, Willard S. Boyle, George E. Smith 2007 - Albert Fert, Peter Gruenberg 2005 - Roy J. Glauber, John L. Hall, Theodor W. Hänsch 2001 - Eric A. Cornell, Wolfgang Ketterle, Carl E. Wieman 1997 - Steven Chu, Claude Cohen-Tannoudji, William D. Phillips 1989 - Norman F. Ramsey, Hans G. Dehmelt, Wolfgang Paul 1981 - Nicolaas Bloembergen, Arthur L. Schawlow, Kai M. Siegbahn 1966 - Alfred Kastler 1964 - Charles H. Townes, Nicolay G. Basov, Aleksandr M. Prokhorov 1944 - Isidor Isaac Rabi 1930 - Venkata Raman 1921 - Albert Einstein 1907 - Albert A. -
Charles Hard Townes (1915–2015)
ARTICLE-IN-A-BOX Charles Hard Townes (1915–2015) C H Townes shared the Nobel Prize in 1964 for the concept of the laser and the earlier realization of the concept at microwave frequencies, called the maser. He passed away in January of this year, six months short of his hundredth birthday. A cursory look at the archives shows a paper as late as 2011 – ‘The Dust Distribution Immediately Surrounding V Hydrae’, a contribution to infrared astronomy. To get a feel for the range in time and field, his 1936 masters thesis was based on repairing a non-functional van de Graaf accelerator at Duke University in 1936! For his PhD at the California Institute of Technology, he measured the spin of the nucleus of carbon-13 using isotope separation and high resolution spectroscopy. Smythe, his thesis supervisor was writing a comprehensive text on electromagnetism, and Townes solved every problem in it – it must have stood him in good stead in what followed. In 1939, even a star student like him did not get an academic job. The industrial job he took set him on his lifetime course. This was at the legendary Bell Telephone Laboratories, the research wing of AT&T, the company which set up and ran the first – and then the best – telephone system in the world. He was initially given a lot of freedom to work with different research groups. During the Second World War, he worked in a group developing a radar based system for guiding bombs. But his goal was always physics research. After the War, Bell Labs, somewhat reluctantly, let him pursue microwave spectroscopy, on the basis of a technical report he wrote suggesting that molecules might serve as circuit elements at high frequencies which were important for communication. -
Wolfgang Pauli Niels Bohr Paul Dirac Max Planck Richard Feynman
Wolfgang Pauli Niels Bohr Paul Dirac Max Planck Richard Feynman Louis de Broglie Norman Ramsey Willis Lamb Otto Stern Werner Heisenberg Walther Gerlach Ernest Rutherford Satyendranath Bose Max Born Erwin Schrödinger Eugene Wigner Arnold Sommerfeld Julian Schwinger David Bohm Enrico Fermi Albert Einstein Where discovery meets practice Center for Integrated Quantum Science and Technology IQ ST in Baden-Württemberg . Introduction “But I do not wish to be forced into abandoning strict These two quotes by Albert Einstein not only express his well more securely, develop new types of computer or construct highly causality without having defended it quite differently known aversion to quantum theory, they also come from two quite accurate measuring equipment. than I have so far. The idea that an electron exposed to a different periods of his life. The first is from a letter dated 19 April Thus quantum theory extends beyond the field of physics into other 1924 to Max Born regarding the latter’s statistical interpretation of areas, e.g. mathematics, engineering, chemistry, and even biology. beam freely chooses the moment and direction in which quantum mechanics. The second is from Einstein’s last lecture as Let us look at a few examples which illustrate this. The field of crypt it wants to move is unbearable to me. If that is the case, part of a series of classes by the American physicist John Archibald ography uses number theory, which constitutes a subdiscipline of then I would rather be a cobbler or a casino employee Wheeler in 1954 at Princeton. pure mathematics. Producing a quantum computer with new types than a physicist.” The realization that, in the quantum world, objects only exist when of gates on the basis of the superposition principle from quantum they are measured – and this is what is behind the moon/mouse mechanics requires the involvement of engineering. -
Turning Point in the Development of Quantum Mechanics and the Early Years of the Mossbauer Effect*
Fermi National Accelerator Laboratory FERMILAB-Conf-76/87-THY October 1976 A TURNING POINT IN THE DEVELOPMENT OF QUANTUM MECHANICS AND THE EARLY YEARS OF THE MOSSBAUER EFFECT* Harry J. Lipkin' Weizmann Institute of Science, Rehovot, Israel Argonne National Laboratory, Argonne, Illinois 60^39 Fermi National Accelerator Laboratory"; Batavia, Illinois 60S10 It is interesting to hear about the exciting early days recalled by Professors Wigner and Wick. I learned quantum theory at a later period, which might be called a turning point in its development, when the general attitude toward quantum mechanics and the study of physics was very different from what it is today. As an undergraduate student in electrical engineering in 19^0 in the United States I found a certain disagreement between the faculty and the students about the "relevance'- of the curriculum. Students thought a k-year course in electrical engineering should include more electronics than a one-semester 3-hour course. But the establishment emphasized the study of power machinery and power transmission because 95'/° of their graduates would eventually get jobs in power. Electronics, they said, was fun for students who were radio hams but useless on the job market. Students at that time did not have today's attitudes and did not stage massive demonstrations and protests against the curriculum. Instead a few of us who wished to learn more interesting things satisfied all the requirements of the engineering school and spent as much extra time as possible listening to fascinating courses in the physics building. There we had the opportunity to listen to two recently-arrived Europeans, Bruno Rossi and Hans Bethe. -
Laser Spectroscopy to Resolve Hyperfine Structure of Rubidium
Laser spectroscopy to resolve hyperfine structure of rubidium Hannah Saddler, Adam Egbert, and Will Weigand (Dated: 12 November 2015) This experiment had two main goals: to create an absorption spectrum for rubidium using the technique of absorption spectroscopy and to resolve the hyperfine structures for the two rubidium isotopes using saturation absorption spectroscopy. The absorption spectrum was used to determine the frequency difference between the ground state and first excited state for both isotopes. The calculated frequency difference was 6950 MHz ± 90 MHz for rubidium 87 and 3060 MHz ± 60 MHz for rubidium 85. Both values agree with the literature values. The hyperfine structure for rubidium 87 was able to be resolved using this experimental setup. The energy differences were determined to be 260 MHz ± 10 MHz and 150 MHz ± 10 Mhz MHz. The hyperfine structure for rubidium 85 was unable to be resolved using this experimental setup. Additionally the theory of doppler broadening was used to make measurements of the full width half maximum. These values were used to calculate a temperature of 310K ± 40 K which makes sense because the experiments were performed at room temperature. I. INTRODUCTION in the theory section and how they were manipulated and used to derive the results from the recorded data. Addi- tionally there is an explanation of experimental error and The era of modern spectroscopy began with the in- uncertainty associated the results. Section V is a conclu- vention of the laser. The word laser was originally an sion that ties the results of the experiment we performed acronym that stood for light amplification by stimulated to the usefulness of the technique of laser spectroscopy. -
The Concept of the Photon—Revisited
The concept of the photon—revisited Ashok Muthukrishnan,1 Marlan O. Scully,1,2 and M. Suhail Zubairy1,3 1Institute for Quantum Studies and Department of Physics, Texas A&M University, College Station, TX 77843 2Departments of Chemistry and Aerospace and Mechanical Engineering, Princeton University, Princeton, NJ 08544 3Department of Electronics, Quaid-i-Azam University, Islamabad, Pakistan The photon concept is one of the most debated issues in the history of physical science. Some thirty years ago, we published an article in Physics Today entitled “The Concept of the Photon,”1 in which we described the “photon” as a classical electromagnetic field plus the fluctuations associated with the vacuum. However, subsequent developments required us to envision the photon as an intrinsically quantum mechanical entity, whose basic physics is much deeper than can be explained by the simple ‘classical wave plus vacuum fluctuations’ picture. These ideas and the extensions of our conceptual understanding are discussed in detail in our recent quantum optics book.2 In this article we revisit the photon concept based on examples from these sources and more. © 2003 Optical Society of America OCIS codes: 270.0270, 260.0260. he “photon” is a quintessentially twentieth-century con- on are vacuum fluctuations (as in our earlier article1), and as- Tcept, intimately tied to the birth of quantum mechanics pects of many-particle correlations (as in our recent book2). and quantum electrodynamics. However, the root of the idea Examples of the first are spontaneous emission, Lamb shift, may be said to be much older, as old as the historical debate and the scattering of atoms off the vacuum field at the en- on the nature of light itself – whether it is a wave or a particle trance to a micromaser. -
Advanced Information on the Nobel Prize in Physics, 5 October 2004
Advanced information on the Nobel Prize in Physics, 5 October 2004 Information Department, P.O. Box 50005, SE-104 05 Stockholm, Sweden Phone: +46 8 673 95 00, Fax: +46 8 15 56 70, E-mail: [email protected], Website: www.kva.se Asymptotic Freedom and Quantum ChromoDynamics: the Key to the Understanding of the Strong Nuclear Forces The Basic Forces in Nature We know of two fundamental forces on the macroscopic scale that we experience in daily life: the gravitational force that binds our solar system together and keeps us on earth, and the electromagnetic force between electrically charged objects. Both are mediated over a distance and the force is proportional to the inverse square of the distance between the objects. Isaac Newton described the gravitational force in his Principia in 1687, and in 1915 Albert Einstein (Nobel Prize, 1921 for the photoelectric effect) presented his General Theory of Relativity for the gravitational force, which generalized Newton’s theory. Einstein’s theory is perhaps the greatest achievement in the history of science and the most celebrated one. The laws for the electromagnetic force were formulated by James Clark Maxwell in 1873, also a great leap forward in human endeavour. With the advent of quantum mechanics in the first decades of the 20th century it was realized that the electromagnetic field, including light, is quantized and can be seen as a stream of particles, photons. In this picture, the electromagnetic force can be thought of as a bombardment of photons, as when one object is thrown to another to transmit a force. -
Mrifrom Picture to Proton
MRI From Picture to Proton Donald W. McRobbie Elizabeth A. Moore Martin J. Graves and Martin R. Prince The Pitt Building, Trumpington Street, Cambridge, United Kingdom The Edinburgh Building, Cambridge CB2 2RU, UK 40 West 20th Street, New York, NY 10011-4211, USA 477 Williamstown Road, Port Melbourne, VIC 3207, Australia Ruiz de Alarcón 13, 28014 Madrid, Spain Dock House, The Waterfront, Cape Town 8001, South Africa http://www.cambridge.org © Donald W. McRobbie, Elizabeth A. Moore, Martin J. Graves and Martin R. Prince 2003 This book is in copyright. Subject to statutory exception and to the provisions of relevant collective licensing agreements, no reproduction of any part may take place without the written permission of Cambridge University Press. First published 2003 Printed in the United Kingdom at the University Press, Cambridge Typeface Utopia 8.5/12 System QuarkXPress® [] A catalogue record for this book is available from the British Library Library of Congress Cataloguing in Publication data MRI from picture to proton / Donald W. McRobbie . [et al.]. p. cm. Includes bibliographical references and index. ISBN 0 521 52319 2 1. Magnetic resonance imaging. I. McRobbie, Donald W., 1958– RC78.7.N83 M756 2003 616.07Ј548–dc21 2002067238 ISBN 0 521 81859 1 hardback ISBN 0 521 52319 2 paperback Contents Acknowledgements xi 1 MR: What’s the attraction? 1 1.1 It’s not rocket science, but I like it 1 1.2 A brief history of medical imaging 2 1.3 How to use this book 4 Further reading 6 Part A The basic stuff 2 Early daze: your first -
OLC Denies FOIA Request for Opinion on Executive Orders
FEDERATION OF AMERICAN SCIENTISTS Board of Sponsors 1725 DeSales Street NW, 6th floor [email protected] (Partial List) Washington, DC 20036 www.fas.org *Sidney Altman Phone: (202) 546-3300 Fax: (202) 675-1010 Bruce Ames F.A.S. *Philip W. Anderson *Kenneth J. Arrow *Julius Axelrod *David Baltimore Frank von Hippel Hal Feiveson Henry C. Kelly Paul Beeson Chairman Secretary-Treasurer President *Baruj Benacerraf *Hans A. Bethe *J. Michael Bishop *Nicolaas Bloembergen *Norman Borlaug *Paul Boyer March 11, 2008 *Owen Chamberlain (202)454-4691 Morris Cohen *Stanley Cohen [email protected] Mildred Cohn *Leon N. Cooper Elizabeth Farris *E. .J. Corey Paul B. Cornely Office of Legal Counsel *James Cronin *Johann Deisenhofer Room 5515, 950 Pennsylvania Avenue, NW Carl Djerassi Ann Druyan Department of Justice *Renato Dulbecco John T. Edsall Washington, DC 20530-0001 Paul R. Ehrlich By fax: 202-514-0563 George Field *Val L. Fitch Jerome D. Frank *Jerome I. Friedman Dear Ms. Farris: *John Kenneth Galbraith *Walter Gilbert *Donald Glaser *Sheldon L. Glashow This is a request under the Freedom of Information Act. Marvin L. Goldberger *Joseph L. Goldstein *Roger C. L. Guillemin We request a copy of an Office of Legal Counsel opinion from the George *Dudley R. Herschbach *Roald Hoffmann W. Bush Administration pertaining in part to the efficacy of executive John P. Holdren *David H. Hubel orders. *Jerome Karle Nathan Keyfitz *H. Gobind Khorana *Arthur Kornberg In particular, Senator Sheldon Whitehouse stated on the Senate floor on *Edwin G. Krebs *Willis E. Lamb December 7 that he had examined an OLC opinion which included, *Leon Lederman *Edward Lewis according to his notes, the following statement or something resembling it: *William N. -
By Willis Lamb
FIVE ENCOUNTERS WITH FELIX BLOCH by Willis Lamb ABSTRACT The impact of Felix Bloch's work on the fields of parity non- conservation, the Mossbauer effect, nuclear induction, chemical shifts, and laser theory is described from a personal point of view. I have benefited enormously from contacts with a number of the great theoretical physicists of the twentieth century. One such relationship far exceeds all the others in respect to duration and meaning to me. I am going to describe five encounters with Felix Bloch that involved purely scientific matters. Personal matters come into the account only to set the times and places of the episodes related. The first two and the last of the five en- counters involved suggestions Felix made to me in connection with my re- search. If I had had the wit, energy, and luck to folIow up properly the earli- est two of these leads, I might have made some very good discoveries. The third encounter involved a request from him for help on his research. It turned out that he did not, after the fact, need this help. Still, the story has a certain interest for me and might provide a footnote for a history of modern physics. The fourth encounter was very slight. I had worked on a certain prob- lem in the early forties. Bloch was working in the same area in the earIy fifties. I had missed following up some interesting aspects of my work. %loch and I talked about his problem and its relationship to my earlier re- search. It later turned out that his work was capable of enormous applica- tion, in chemistry rather than in physics, so that he did not follow it up as far as he might have done. -
The Light That Shin
THE LIGHT THAT SHIN by CHARLES H. TOWNES A Nobel laureate recounts ON JULY 21, 1969, astronauts Neil Armstrong and Edwin “Buzz” Aldrin set up an array of small reflectors on the invention of the laser the moon, facing them toward Earth. At the same time, two teams of astrophysicists, one at the University of California’s Lick Observatory and the other at the University of Texas’s and the birth of quantum McDonald Observatory, were preparing small instruments on two big telescopes. Ten days later, the Lick team pointed electronics. its telescope at the precise location of the reflectors on the moon and sent a small pulse of power into the hardware they had added to it. A few days after that, the McDonald team went through the same steps. In the heart of each telescope, a narrow beam of extraordinarily pure red light emerged from a synthetic ruby crystal, pierced the sky, and entered the near vacuum of space. The two rays were still only a thousand yards wide after traveling 240,000 miles to illumi- nate the moon-based reflectors. Slightly more than a second after each light beam hit its target, the crews in California and Texas detected its faint reflection. The brief time inter- val between launch and detection of these light pulses per- mitted calculation of the distance to the moon to within an inch—a measurement of unprecedented precision. The ruby crystal for each light source was the heart of a laser (an acronym for light amplification by stimulated emis- sion of radiation), which is a device first demonstrated in 1960, just nine years earlier. -
Nicolaas Bloembergen Arthur Schawlow
Nicolaas Bloembergen Nonlinear optics is the generic title that describes what happens to material Arthur Schawlow when Irradiated with the large intensities available in laser beams. Previously the S. D. Smith, Edinburgh dipole moment induced by the incident (Heriot Watt University) light wave was considered to be adequa tely described by one constant proportio nal to the amplitude of the electric field. However, laser fields comparable with The award of the Nobel Prize to both N. light waves in a nonlinear dielectric and inter-atomic fields can be readily obtain Bloembergen of Harvard University and A. associated topics with collaborators such ed, so that the induced polarisation ex Schawlow of Stanford University has given as Armstrong, Ducuing, Pershan and panded in powers of the field can have great pleasure to the Quantum Electronics Shen, effectively re-wrote Maxwell's equa significant values — up to at least the Division of the European Physical Society. tions for the first time in 90 years and thus fifth order. In these circumstances, light Both Nicolaas Bloembergen and Arthur laid the theoretical groundwork of the sub frequencies can be mixed, and a rich Schawlow had been intimately concerned ject so thoroughly, that few effects were variety of new nonlinear effects have with the early basic physics of the laser dur observed in the following 20 years that had been discovered. ing the latter part of the 1950's and not been anticipated. Thus the first obser although Townes, Basov and Prokhorov vation of harmonic generation by Franken were the first to be honoured by the Nobel and colleagues found itself with a ready- Toronto where he obtained his Bachelor's, Committee in 1964, Bloembergen and made framework for future developments.