Alexander Prokhorov

Soviet-Russian physicist

Alexander Prokhorov

Александр Прохоров

Prokhorov in 1964

Born|

Alexander Michael Prochoroff

(1916-07-11)11 July 1916

Peeramon, Queensland, Australia

Died| 8 January 2002(2002-01-08) (aged 85)

Moscow, Russia

Resting place| Novodevichy Cemetery, Moscow
Known for| Lasers and masers
Awards| 1964 Nobel Prize in Physics
1987 Lomonosov Gold Medal
Scientific career
Fields| Physics

Alexander Mikhailovich Prokhorov[1] (born Alexander Michael Prochoroff, Russian: Алекса́ндр Миха́йлович Про́хоров; 11 July 1916 – 8 January 2002) was a Russian physicist and researcher on lasers and masers in the former Soviet Union for which he shared the Nobel Prize in Physics in 1964 with Charles Hard Townes and Nikolay Basov.

## Early life

[edit]

Alexander Michael Prochoroff was born on 11 July 1916 at Russell Road, Peeramon, Queensland, Australia (now 322 Gadaloff Road, Butchers Creek, situated about 30 km from Atherton), to Mikhail Ivanovich Prokhorov and Maria Ivanovna (née Mikhailova), Russian revolutionaries who had emigrated from Russia to escape repression by the tsarist regime. As a child he attended Butchers Creek State School.[2][3]

In 1923, after the October Revolution and the Russian Civil War, the family returned to Russia. In 1934, Prokhorov entered the Saint Petersburg State University to study physics. He was a member of the Komsomol from 1930 to 1944. Prokhorov graduated with honors in 1939 and moved to Moscow to work at the Lebedev Physical Institute, in the oscillations laboratory headed by academician N. D. Papaleksi. His research there was devoted to propagation of radio waves in the ionosphere. At the onset of World War II, in June 1941, he joined the Red Army. Prokhorov fought in the infantry, was wounded twice in battles, and was awarded three medals, including the Medal For Courage in 1946.[4] He was demobilized in 1944 and returned to the Lebedev Institute where, in 1946, he defended his Ph.D. thesis on "Theory of Stabilization of Frequency of a Tube Oscillator in the Theory of a Small Parameter".[1][5][6]

## Research

[edit]

In 1947, Prokhorov started working on coherent radiation emitted by electrons orbiting in a cyclic particle accelerator called a synchrotron. He demonstrated that the emission is mostly concentrated in the microwave spectral range. His results became the basis of his habilitation on "Coherent Radiation of Electrons in the Synchrotron Accelerator", defended in 1951. By 1950, Prokhorov was assistant chief of the oscillation laboratory. Around that time, he formed a group of young scientists to work on radiospectroscopy of molecular rotations and vibrations, and later on quantum electronics. The group focused on a special class of molecules which have three (non-degenerate) moments of inertia. The research was conducted both on experiment and theory. In 1954, Prokhorov became head of the laboratory. Together with Nikolay Basov he developed theoretical grounds for creation of a molecular oscillator and constructed such a device based on ammonia. They also proposed a method for the production of population inversion using inhomogeneous electric and magnetic fields. Their results were first presented at a national conference in 1952, but not published until 1954–1955.[1][6]

In 1955, Prokhorov started his research in the field of electron paramagnetic resonance (EPR). He focused on relaxation times of ions of the iron group elements in a lattice of aluminium oxide, but also investigated other, "non-optical", topics, such as magnetic phase transitions in DPPH.[7] In 1957, while studying ruby, a chromium-doped variation of aluminium oxide, he came upon the idea of using this material as an active medium of a laser. As a new type of laser resonator, he proposed, in 1958, an "open type" cavity design, which is widely used today. In 1963, together with A. S. Selivanenko, he suggested a laser using two-quantum transitions. For his pioneering work on lasers and masers, in 1964, he received the Nobel Prize in Physics shared with Nikolay Basov and Charles Hard Townes.[1][6]

## Posts and awards

[edit]

Prokhorov with King Gustaf VI Adolf and wife of Townes at the Nobel Prize banquet in 1964

In 1959, Prokhorov became a professor at Moscow State University – the most prestigious university in the Soviet Union; the same year, he was awarded the Lenin Prize. In 1960, he became a member of the Russian Academy of Sciences and elected Academician in 1966. In 1967, he was awarded his first Order of Lenin (he received five of them during life, in 1967, 1969, 1975, 1981 and 1986). In 1968, he became vice-director of the Lebedev Institute and in 1971 took the position of Head of Laboratory of another prestigious Soviet institution, the Moscow Institute of Physics and Technology. In the same year, he was elected a member of the American Academy of Arts and Sciences.[5] In 1983 he was elected a Member of the German Academy of Sciences Leopoldina.[8] Between 1982 and 1998, Prokhorov served as acting director of the General Physics Institute of the Russian Academy of Sciences, and after 1998 as honorary director. After his death in 2002, the institute was renamed the A. M. Prokhorov General Physics Institute [Wikidata] of the Russian Academy of Sciences.[5][6] Prokhorov was a Member and one of the Honorary Presidents of the International Academy of Science, Munich and supported 1993 the foundation and development of the Russian Section of International Academy of Science, Moscow.[9][10]

In 1969, Prokhorov became a Hero of Socialist Labour, the highest degree of distinction in the Soviet Union for achievements in national economy and culture. He received the second such award in 1986.[6] Starting in 1969, he was the chief editor of the Great Soviet Encyclopedia. He was awarded the Frederic Ives Medal, the highest distinction of the Optical Society of America (OSA), in 2000[11] and became an Honorary OSA Member in 2001.[12] The same year, he was awarded the Demidov Prize.[13]

He died on 8 January 2002 at Moscow and was buried at Novodevichy Cemetery.

## Politics

[edit]

Prokhorov became a member of the Communist Party in 1950.[14] In 1983, together with three other academicians – Andrey Tychonoff, Anatoly Dorodnitsyn and Georgy Skryabin – he signed the famous open letter[15] called "when they lose honor and conscience"[16] (Когда теряют честь и совесть), denouncing Andrey Sakharov's article[17] in the Foreign Affairs.

## Family

[edit]

Basov and Prokhorov with wives in Stockholm in 1964

Both of Prokhorov's parents died during World War II. Prokhorov married geographer Galina Shelepina in 1941, and they had a son, Kiril, born in 1945. Following his father, Kiril Prokhorov became a physicist in the field of optics and is currently leading a laser-related laboratory at the A. M. Prokhorov General Physics Institute.[4][18]

Alexander Prokhorov on 2016 postage stamp of Russia

## Honours and awards

[edit]

* Mandelstam Prize (1948)
* Lenin Prize (1959)
* Five Orders of Lenin (including 11 May 1981)
* Order of the Patriotic War, 1st class (1985)
* Nobel Prize in Physics (1964)
* Hero of Socialist Labour, twice (1969, 1986)
* Medal For Courage
* USSR State Prize (1980)
* Order of Merit for the Fatherland, 2nd class (1996)
* State Prize of the Russian Federation (1998)
* Medal Frederick Ayvesa (2000)
* Demidov Prize (2001)
* Lomonosov Gold Medal (Moscow State University, 1987)
* Award of the Council of Ministers
* State Prize of the Russian Federation in science and technology (2003, posthumously) for the development of scientific and technological foundations of metrological support of measurements of length in the microwave and nanometer ranges and their application in microelectronics and nanotechnology
* Foreign Member of the Czechoslovak Academy of Sciences (1982)
* Jubilee Medal "In Commemoration of the 100th Anniversary since the Birth of Vladimir Il'ich Lenin"
* Medal "For the Victory over Germany in the Great Patriotic War 1941–1945"
* Jubilee Medal "Twenty Years of Victory in the Great Patriotic War 1941-1945"
* Jubilee Medal "Thirty Years of Victory in the Great Patriotic War 1941-1945"
* Jubilee Medal "Forty Years of Victory in the Great Patriotic War 1941-1945"
* Medal "For Valiant Labour in the Great Patriotic War 1941-1945"
* Medal "Veteran of Labour"
* Jubilee Medal "50 Years of the Armed Forces of the USSR"
* Medal "In Commemoration of the 800th Anniversary of Moscow"
* Medal "In Commemoration of the 850th Anniversary of Moscow"

## Books

[edit]

* A. M. Prokhorov (Editor in Chief), J. M. Buzzi, P. Sprangle, K. Wille. Coherent Radiation Generation and Particle Acceleration, 1992, ISBN 0-88318-926-7. Research Trends in Physics series published by the American Institute of Physics Press (presently Springer, New York)
* V. Stefan and A. M. Prokhorov (Editors) Diamond Science and Technology Vol 1: Laser Diamond Interaction. Plasma Diamond Reactors (Stefan University Press Series on Frontiers in Science and Technology) 1999 ISBN 1-889545-23-6.
* V. Stefan and A. M. Prokhorov (Editors). Diamond Science and Technology Vol 2 (Stefan University Press Series on Frontiers in Science and Technology) 1999 ISBN 1-889545-24-4.

## References

[edit]

1. ^ a b c d Alexander Prokhorov on Nobelprize.org  including the Nobel Lecture, 11 December 1964 Quantum Electronics
2. ^ Tablelander (newspaper) 19 July 2016 'Prokharov centenary'
3. ^ Collins, Stephen (October 2016). "National Science Week 2016 - "Prokhorov Centenary" (PDF). AOS News. 30 (3): 14–15. ISSN 1832-4436. Archived (PDF) from the original on 21 February 2022. Retrieved 21 February 2022.
4. ^ a b Основные даты жизни и деятельности академика А.М. Прохорова Archived 11 December 2010 at the Wayback Machine (in Russian)
5. ^ a b c Прохоров Александр Михайлович Archived 5 October 2015 at the Wayback Machine in Great Soviet Encyclopedia (in Russian)
6. ^ a b c d e Прохоров Александр Михайлович Archived 15 May 2011 at the Wayback Machine at warheroes.ru (in Russian)
7. ^ A. M. Prokhorov and V.B. Fedorov, Soviet Physics JETP 16 (1963) 1489.
8. ^ "List of Members". www.leopoldina.org. Archived from the original on 4 October 2017. Retrieved 4 October 2017.
9. ^ "Presidium of the International Academy of Science= Ias-icsd.org" (PDF). Archived (PDF) from the original on 2 April 2015. Retrieved 16 March 2015.
10. ^ "Foundation of the Russian Section of the International Academy of Science= ias-icsd.org". Archived from the original on 2 April 2015. Retrieved 16 March 2015.
11. ^ Frederic Ives Medal Archived 27 September 2007 at the Wayback Machine
12. ^ OSA Honorary Members Archived 20 August 2008 at the Wayback Machine
13. ^ Сост. И. Г. Бебих; Г. Н. Михайлова; А. В. Троицкий (2004). Александр Михайлович Прохоров, 1916–2002 (Материалы к биобиблиогр. ученых) 2-е изд., доп. (in Russian). М.: Наука. p. 442\. ISBN 5-02-033176-7. Archived from the original on 21 August 2007.
14. ^ "Australia's forgotten Nobel Prize winner: Laser pioneer Alexander Prokhorov". ABC News. 3 August 2016. Archived from the original on 2 April 2017. Retrieved 2 April 2017.
15. ^ Когда теряют честь и совесть Archived 19 November 2009 at the Wayback Machine (in Russian)
16. ^ "1. Андрей Сахаров. ОПАСНОСТЬ ТЕРМОЯДЕРНОЙ ВОЙНЫ (Открытое письмо доктору Сиднею Дреллу) ::: Боннэр Е.Г. - Постскриптум: Книга о горьковской ссылке ::: Боннэр Елена Георгиевна ::: Воспоминания о ГУЛАГе :: База данных :: Авторы и тексты". www.sakharov-center.ru. Archived from the original on 13 July 2021. Retrieved 13 July 2021.
17. ^ "The Montreal Gazette – Google News Archive Search". Archived from the original on 21 February 2022. Retrieved 20 February 2015.
18. ^ "Кирилл Александрович Прохоров". Archived from the original on 21 February 2015. Retrieved 20 February 2015.

## External links

[edit]

Wikimedia Commons has media related to Aleksandr Prokhorov.

* Alexander Prokhorov on Nobelprize.org  including the Nobel Lecture, 11 December 1964 Quantum Electronics
* Prokhorov's role in the invention of lasers and masers
* Prokhorov's grave in Novodevichy cemetery

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* Dorothy Hodgkin (Great Britain)

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Physics|

* Charles Hard Townes (United States)
* Nikolay Basov (Soviet Union)
* Alexander Prokhorov (Soviet Union)

Physiology or Medicine|

* Konrad Emil Bloch (United States)
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