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11. |
Junction lasers |
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Physics Today,
Volume 24,
Issue 3,
1971,
Page 42-48
L. A. D'Asaro,
Jose´ E. Ripper,
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摘要:
Junction lasers are devices in which laser action is produced by a high, nonequilibrium concentration of electrons and holes within the same small region of a semiconductor. Why do we want junction lasers? They are interesting not only from the viewpoint of the physics involved; their properties suit them for industrial application as well. The advantages include:▸ Smallness: Dimensions of the active region are typically one to two microns, with the largest dimension usually no more than a fraction of a millimeter.▸ Mechanical stability: The mirrors are an integral part of the laser structure, and are usually formed by cleaving the crystal.▸ High efficiency: Pulsed junction lasers have operated at as much as 40&percent; external quantum efficiency.▸ Reasonable power: Continuous output of 40 mW has been obtained at room temperature, with much higher powers at low temperatures. The record peakpower output in a 100‐nanosec pulse is about 100 watts.▸ Versatility: Junction lasers are conveniently pumped with direct current, and their output can be amplitude, frequency or pulse‐position modulated into the GHz range. They can lase at wavelengths from 20 to 0.75 microns with the proper choice of semiconductor alloy, and can operate in a single mode. Within the last year, junction lasers have been operated continuously at room temperature.
ISSN:0031-9228
DOI:10.1063/1.3022625
出版商:AIP
年代:1971
数据来源: AIP
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12. |
My World Line: An Informal Autobiography |
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Physics Today,
Volume 24,
Issue 3,
1971,
Page 51-52
George Gamow,
Ralph A. Alpher,
Robert Herman,
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ISSN:0031-9228
DOI:10.1063/1.3022626
出版商:AIP
年代:1971
数据来源: AIP
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13. |
Demonstrations in Physics |
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Physics Today,
Volume 24,
Issue 3,
1971,
Page 52-53
Julius S. Miller,
Eric M. Rogers,
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ISSN:0031-9228
DOI:10.1063/1.3022627
出版商:AIP
年代:1971
数据来源: AIP
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14. |
Thin‐Film TransistorsandApplied Solid State Science, Vol. 1: Advances in Applied Solid State Physics |
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Physics Today,
Volume 24,
Issue 3,
1971,
Page 53-56
Andrew C. Tickle,
Raymond Wolfe,
Daniel C. Mattis,
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ISSN:0031-9228
DOI:10.1063/1.3022629
出版商:AIP
年代:1971
数据来源: AIP
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15. |
Phenomenological Theories of High Energy Scattering: An Experimental Evaluation |
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Physics Today,
Volume 24,
Issue 3,
1971,
Page 56-57
V. D. Barger,
D. B. Cline,
San Fu Tuan,
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ISSN:0031-9228
DOI:10.1063/1.3022630
出版商:AIP
年代:1971
数据来源: AIP
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16. |
Tongues of Conscience: Weapons Research and The Scientists' Dilemma |
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Physics Today,
Volume 24,
Issue 3,
1971,
Page 57-59
Robert W. Reid,
Joel A. Snow,
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ISSN:0031-9228
DOI:10.1063/1.3022631
出版商:AIP
年代:1971
数据来源: AIP
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17. |
Solid State Physics |
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Physics Today,
Volume 24,
Issue 3,
1971,
Page 59-60
Ryogo Kubo,
Takeo Nagamiya,
Peter J. Price,
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ISSN:0031-9228
DOI:10.1063/1.3022632
出版商:AIP
年代:1971
数据来源: AIP
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18. |
New Books |
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Physics Today,
Volume 24,
Issue 3,
1971,
Page 60-63
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ISSN:0031-9228
DOI:10.1063/1.3022633
出版商:AIP
年代:1971
数据来源: AIP
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19. |
The Depression and World War II |
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Physics Today,
Volume 24,
Issue 3,
1971,
Page 65-66
Victor Gilinsky,
Charles Weiner,
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ISSN:0031-9228
DOI:10.1063/1.3022636
出版商:AIP
年代:1971
数据来源: AIP
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20. |
Correction |
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Physics Today,
Volume 24,
Issue 3,
1971,
Page 66-66
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摘要:
January 1971, page 17, line 5. In the letter by Robert Pearlstein two lines were omitted in the last paragraph.This passage should have read (omitted words in italic): “Dyson points out the suitability of particle experimentalists for dealing with the problem of sequencingDNA. DeWitt mentions Wigner's ideas on a nonlinear generalization ofquantum mechanics in conjunction with consciousness—a presumptive property of certain biological systems.
ISSN:0031-9228
DOI:10.1063/1.3043306
出版商:AIP
年代:1971
数据来源: AIP
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