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June 2018 Issue, Volume 86, No. 6
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A mechanical beam chopper consists of a rotating disc of regularly spaced wide slits which allow light to pass through them. A continuous light beam, after passing through the rotating disc, is switched-on and switched-off periodically, and a series of optical pulses are produced. The intensity of each pulse is expected to rise and fall smoothly with time. However, a careful study has revealed that the edges of mechanically chopped laser light pulses consist of periodic intensity undulations which can be detected with a photo detector. In this paper, it is shown that the intensity undulations in mechanically chopped laser pulses are produced by diffraction of light from the rotating disc, and a detailed explanation is given of the intensity undulations in mechanically chopped laser pulses. An experiment presented in this paper provides an efficient method to capture a one dimensional diffraction profile of light from a straight sharp-edge in the time domain. In addition, the experiment accurately measures wavelengths of three different laser beams from the undulations in mechanically chopped laser light pulses.
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Letters to the Editor
by B. Cameron Reed. DOI: 10.1119/1.5036944.
Papers
by Samridhi Gambhir, and Mandip Singh. DOI: 10.1119/1.5029821.
by Jed Brody, and Charlotte Selton. DOI: 10.1119/1.5036619.
by Arijit Roy, Abhishek Mallick, Aparna Adhikari, Priyanka Guinand and Dibyendu Chatterjee. DOI: 10.1119/1.5026994.
by Luis Bilbao. DOI: 10.1119/1.5034445.
by Michael L. Honke, and Christopher P. Bidinosti. DOI: 10.1119/1.5034350.
by Lawrence N. Virgin. DOI: 10.1119/1.5025037.
by Mark A. Nurge, Robert C. Youngquist, and Stanley O. Starr. DOI: 10.1119/1.5024220.
by Michael R. R. Good. DOI: 10.1119/1.5030543.
by Stefan Borgers, Simeon V枚lkel, Wolfgang Sch枚pf, and Ingo Rehberg. DOI: 10.1119/1.5029823.
Notes and Discussions
by L. A. del Pino, and S. Curilef. DOI: 10.1119/1.5029480.
by K. M. Browne. DOI: 10.1119/1.5027490.
Apparatus and Demonstration Notes
by Tom A. Kuusela. DOI: 10.1119/1.5029829.
Book Reviews
by S枚nke Johnsen. DOI: 10.1119/1.5022186.
Books Received
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General Information, Resources for Authors, Reviewers, and Readers
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