Zobrazeno 1 - 10 of 25 pro vyhledávání: '"T. F. Johnston"'
1
Instrumentation techniques for beam quality and propagation-parameter measurement
Autor: M. W. Sasnett, T. F. Johnston
Publikováno v: OSA Annual Meeting.
Since “beam diameter” is a somewhat ambiguous concept and not yet standardized, instruments that measure beam diameters often adhere to differing conventions.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4514da5f280442fc0db7d869bfab26cc
https://doi.org/10.1364/oam.1993.waa.3
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2
Calibration standard for laser beam profilers: method for absolute accuracy measurement with a Fresnel diffraction test pattern
Autor: John M. Fleischer, T. F. Johnston
Publikováno v: Applied Optics. 35:1719
The absolute accuracy of a clip-level laser beam profiler is measured to the 0.3% level, by comparison of the profiler's reading to the known width of a Fresnel diffraction test pattern. A pair of opposed knife edges, illuminated by a quasi-uniform a
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d47e87b21c382ecf27ba1656f1e1e4fa
https://doi.org/10.1364/ao.35.001719
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3
Laser beam quality versus aperture size in a cw argon-ion laser
Autor: Jean-luc Doumont, M. W. Sasnett, T. F. Johnston, Anthony E. Siegman
Publikováno v: Optics Letters. 17:198
The measured beam quality of a typical argon-ion laser that uses a stable resonator is found to be slightly greater than unity for small intracavity aperture sizes, approaching M2 ≈ 1 as the mode-control aperture diameter is increased. Above a crit
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5752c48c080cac4f59e9b5de7e90a49c
https://doi.org/10.1364/ol.17.000198
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5
Production and decay of the A2 meson in 7 GeV/cπ−p interactions
Autor: A.W. Key, B.Y. Oh, A.F. Garfinkel, T. S. Yoon, W. D. Walker, T. F. Johnston, J.D. Prentice, R. Morse
Publikováno v: Nuclear Physics B. 24:253-272
The production and decay of the A 2 meson has been studied in a 3.3 events/μb, 7 GeV/ cπ − p bubble chamber experiment. The cross section for π − p→A 2 − p was found to be 120±25 μ b. The reaction π − p→A 2 − π 0 p was also obser
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::06545843976100c0f9c89c1191596e4e
https://doi.org/10.1016/0550-3213(70)90236-1
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7
MEASUREMENT OF THE LOWER‐LEVEL POPULATION OF THE ARGON ION LASER USING LASER‐INDUCED POPULATION CHANGES
Autor: T. F. Johnston
Publikováno v: Applied Physics Letters. 17:161-164
A method is described for determining the inversion ratio on a laser transition from measurements of laser‐induced changes in the upper level population. This method is used to determine the lower‐level population of the 4880‐A transition in th
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8cdc78c813adeddce21673e37f3dad4c
https://doi.org/10.1063/1.1653348
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10
Possible interpretations of the pω mass enhancement near threshold, in π−p → π−pω at 7 GeV/c
Autor: T. F. Johnston, T. S. Yoon, J.D. Prentice, N.R. Steenberg, R. Morse, W. D. Walker, A. Chao, M.S. Milgram, B.Y. Oh
Publikováno v: Nuclear Physics B. 18:1-16
An analysis is given of the threshold signal in the pω invariant mass of the one constraint reaction π − p → π − p ω at 7 GeV/ c . We find that the experimental data favour interpretation of this effect as a resonance of mass ≈ 1750 MeV a
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a77f281c0c34573415904ff8a7f034c0
https://doi.org/10.1016/0550-3213(70)90269-5
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