Robert Hellwarth

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Robert Willis Hellwarth (born December 10, 1930 in Ann Arbor , Michigan ) is an American physicist who deals with (nonlinear) optics and laser physics.

Life

Hellwarth graduated from Princeton University with a bachelor's degree in engineering in 1952 (BSE) and received his doctorate in 1955 from the University of Oxford . From 1955 he was at Hughes Research Laboratories , where he was Senior Staff Physicist in 1965 . In addition, he taught as a lecturer at Caltech from 1955 to 1965 (and he was a Senior Research Fellow there from 1966 to 1970 ). Since 1970 he has been Professor of Electrical Engineering and Physics at the University of Southern California .

He was visiting scholar at the Clarendon Laboratory , Oxford (1970/71) and visiting fellow at St Peter's College , Oxford.

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In 1977 he introduced the four-wave mixing method for optical phase conjugation .

At Caltech he worked several times with Richard Feynman , for example on polarons and the treatment of measles with elementary quantum mechanics, giving a geometric interpretation of the quantum mechanics of two-state systems using the equation of a precessing vector.

He has been interested in the physics of lasers and measles since their introduction in 1960 at the Hughes Research Laboratory , where he worked at the time. In 1962, he demonstrated with FJ McClung first the principle of the Q-switch (Q switch).

He introduced various techniques into laser spectroscopy , for example what he called the Raman-induced Kerr effect and the Raman-induced phase conjugation. In 1963 he developed the theory of stimulated Raman scattering . (The term stimulated scattering comes from him). Shortly before that, he was involved in the development of the first Raman laser (with major contributions from Gisela Eckhardt and Eric Woodbury ).

In 1974 he used non-linear optical effects ( frequency doubling ) in microscopy (see multiphoton microscope ).

In 1985 he specified the physical limits of logical operations (e.g. for optical computers ) in non-linear optics.

Honors and memberships

In 1983 he received the Charles Hard Townes Award and in 1985 the Quantum Electronics Award of the IEEE .

Hellwarth is a Fellow of the National Academy of Sciences , the American Association for the Advancement of Science , the National Academy of Engineering , a Fellow of the American Physical Society , the American Academy of Arts and Sciences and the Optical Society of America, and an IEEE Fellow . He was co-editor of the IEEE Journal of Quantum Electronics.

Web links

Individual evidence

  1. ↑ Life data according to American Men and Women of Science , Thomson Gale 2004
  2. ↑ Hellwarth Theory of phase conjugation in waveguides by four wave mixing , IEEE Journal of Quantum Electronics, QE-15, 1979, pp. 101-109
  3. ^ Feynman, Hellwarth, Iddings, Platzman Mobility of slow electrons in a polar crystal , Physical Review, Volume 127, 1962, p. 1004
  4. ^ Feynman, F. Vernon, RW Hellwarth Geometric representation of the Schrödinger equation for solving maser equations , J. Appl. Phys, Volume 28, 1957, p. 49
  5. ^ Richard P. Feynman, Frank L. Vernon, and Robert W. Hellwarth: Geometrical Representation of the Schrödinger Equation for Solving Maser Problems . In: Journal of Applied Physics . tape 28 , no. 1 , 1957, pp. 49 , doi : 10.1063 / 1.1722572 (English).
  6. ↑ Hellwarth, McClung Giant optical pulsations from ruby , Journal of Applied Physics, Volume 33, 1962, pp. 828-829
  7. ↑ Hellwarth Theory of stimulated Raman scattering , Physical Review, Volume 130, 1963, pp. 1850-1852, abstract
  8. ^ Hellwarth Physical limits of logic operations employing nonlinear optical effects , Topical meeting on optical computing, Incline Village, Nevada, March 1985
personal data
SURNAME Hellwarth, Robert
ALTERNATIVE NAMES Hellwarth, Robert Willis
BRIEF DESCRIPTION American physicist
DATE OF BIRTH December 10, 1930
PLACE OF BIRTH Ann Arbor , Michigan