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268:. In a widely cited 1982 paper, he introduced M. Lax's "alpha parameter" for the first time into semiconductor laser physics and used it to explain why the linewidth of a semiconductor laser is about 50 times greater than that predicted by the theory of Schawlow and Townes. The alpha parameter, also known as the "Henry factor", remains a basic laser property that aids in understanding a variety of semiconductor laser behaviors.
278:. In 1968, he and coworkers reported that the red luminescence originated from an electron-hole pair bound to a nearest neighbor donor-acceptor pair composed of zinc and oxygen. Subsequently, red as well as green GaP LEDs were manufactured and used as indicator lights in a variety of applications.
304:
in 1996. With
Kazarinov, he published "Quantum Noise in Photonics" (Rev. Mod. Phys. 68, 801–853 ), which explained the physical nature of noise in optical communications. The basic equations governing noise phenomena were derived from first principles and applied to specific examples.
320:(1999, Optical Society of America), and the Prize for Industrial Applications of Physics (2001, American Institute of Physics). He was the recipient of an Alumni Award for Distinguished Service from the University of Illinois College of Engineering (2001).
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Henry further realized that these discrete electron states would greatly alter the optical absorption edge of the semiconductor. Instead of the absorption being a smooth curve steeply rising with optical energy, it would consist of a series of steps.
241:. He also realized that the laser wavelength could be changed merely by changing the thickness of the thin quantum well layers, whereas in a conventional laser, a change in wavelength requires a change in layer composition.
521:
Reviewed in Ch. 8, "Silicon
Optical Bench Waveguide Technology," by Yuan P. Li and Charles H. Henry, 319, in Optical Fiber Telecommunications IIIB, ed. by I.P. Kaminow and T.L. Koch (San Diego, California, Academic Press,
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After Dingle's experiment showed the reality of Henry's predicted quantum effects, Henry realized that the quantum well structure would alter the density of states of the semiconductor and result in an improved
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Henry was a Fellow of the
American Physical Society, the Institute of Electrical and Electronics Engineers, and the American Association for the Advancement of Science, and was a member of Sigma Xi.
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Bell
Laboratories in 1997 as a Distinguished Member of Technical Staff. He published 133 technical papers and held 28 patents, including a 1976 patent covering what is now called the
244:
On March 7, 1975, Henry and Dingle filed a patent entitled "Quantum
Effects in Heterostructure Lasers," which was issued on Sept. 21, 1976. The story of the origin of the
183:. He joined Bell Laboratories in 1965 as a member of technical staff. From 1971 to 1975, he was head of the Semiconductor Electronics Research Department. He retired from
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U.S. Patent No. 3,982,207, filed on March 7, 1975, issued Sept. 21, 1976, "Quantum
Effects in Heterostructure Lasers"; inventors Raymond Dingle and Charles Howard Henry.
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is a waveguide for electrons, and that a heterostructure with a thin central active layer would have discrete electron modes. Such a heterostructure was later named a
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In early 1973, he proposed to
Raymond Dingle that he look for these steps, and they were observed and reported in 1974 in a paper the pair wrote with W. Wiegmann.
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206:. He was an inventor as well as an experimenter, with a particular interest in understanding the theory underlying semiconductor optical devices.
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R. Dingle, W. Wiegmann, and C. H. Henry, "Quantum States of
Confined Carriers in Very Thin AlxGa(1–x)As-GaAs-AlxGa(1–x)As Heterostructures,"
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The name quantum well was introduced into semiconductor laser physics in the late 1970s in the papers of N. Holonyak and his students.
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Throughout his career, Henry worked at the forefront of semiconductor-based optical technologies and science:
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occurred to Henry in late 1972. While thinking about optical waveguides, Henry suddenly realized that a
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In
September, 2012, Henry was inducted into the University of Illinois's Engineering Hall of Fame.
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Charles H. Henry, Foreword, "The Origin of
Quantum Wells and the Quantum Well Laser," in
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448:, ed. Peter S. Zory Jr. (San Diego, California, Academic Press, 1993), of the series
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routers, invented by C. Dragone, were fabricated with this technology and used for
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C.H. Henry, P.J. Dean, and J.D. Cuthbert, "New Red Pair Luminescence From GaP,"
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136:(May 6, 1937 – September 16, 2016) was an American physicist. He was born in
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Early in his career, Henry identified the source of red light emission in
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In addition to his seminal work on quantum wells and the invention of the
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Beginning in the mid-1980s, Henry (with R. F. Kazarinov) initiated a new
168:, a publication of the Physics Department of the University of Illinois.
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Charles H. Henry and Rudolf F. Kazarinov, "Quantum Noise in Photonics,"
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technology based on silica waveguides fabricated on silicon wafers.
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Henry's entire professional career was spent in the research area of
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C.H. Henry, "Theory of the Linewidth of Semiconductor Lasers,"
335:, where he met his wife, Helene. They lived for many years in
226:, and the modes are the electron states of the quantum well.
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He is survived by three children, Ronald, Karen, and Alice.
387:"Charles H. Henry's Obituary on The News & Observer"
164:. In March 2008, he was featured in an article in the
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316:Henry received the Morton Award (1999, IEEE), the
450:Quantum Electronics—Principles and Applications
607:University of Illinois Urbana-Champaign alumni
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489:Encyclopedia of Laser Physics and Technology
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617:Fellows of the American Physical Society
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252:, edited by Peter S. Zory Jr. (1993).
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556:from the original on 5 February 2014
248:is told by Henry in the foreword to
156:degree in physics in 1965 from the
148:degree in physics in 1959 from the
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300:Henry returned to the physics of
291:wavelength-division multiplexing
592:20th-century American inventors
485:"Linewidth Enhancement Factor"
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331:Henry was born and raised in
204:photonic integrated circuits
283:photonic integrated circuit
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546:"Engineering at Illinois"
318:Charles Hard Townes Award
287:Arrayed waveguide grating
160:, under the direction of
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612:Scientists at Bell Labs
602:Scientists from Chicago
471:IEEE J.Quant. Electron
220:double heterostructure
158:University of Illinois
95:University of Illinois
374:Physics Illinois News
196:light-emitting diodes
166:Physics Illinois News
150:University of Chicago
83:University of Chicago
266:semiconductor lasers
200:semiconductor lasers
597:American physicists
473:. QE-18, 259 (1982)
446:Quantum Well Lasers
250:Quantum Well Lasers
239:semiconductor laser
185:Lucent Technologies
368:2016-04-17 at the
262:quantum well laser
256:Other achievements
246:quantum well laser
189:quantum well laser
16:American physicist
535:. 68, 801 (1996).
309:Awards and honors
273:gallium phosphide
173:Bell Laboratories
144:. He received an
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122:Bell Laboratories
112:Scientific career
67:16 September 2016
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118:Institutions
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69:(2016-09-16)
587:2016 deaths
582:1937 births
177:Murray Hill
576:Categories
510:Phys. Rev.
391:legacy.com
350:References
337:New Jersey
181:New Jersey
48:6 May 1937
44:1937-05-06
343:in 2005.
76:Education
554:Archived
366:Archived
152:, and a
142:Illinois
56:Illinois
376:, 2008.
363:Article
333:Chicago
202:, and
138:Chicago
52:Chicago
522:1997).
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154:Ph.D.
562:2016
496:2016
454:ISBN
398:2016
276:LEDs
146:M.S.
64:Died
38:Born
175:in
100:PhD
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