Diffraction effects in mechanically chopped laser pulses

Diffraction effects in mechanically chopped laser pulses A mechanical beam chopper consists of a rotating disc of regularly spaced wide slitswhich allow light to pass through them. A continuous light beam, after passing through therotating disc, is switched-on and switched-off periodically, and a series of opticalpulses are produced. The intensity of each pulse is expected to rise and fall smoothlywith time. However, a careful study has revealed that the edges of mechanically choppedlaser light pulses consist of periodic intensity undulations which can be detected with aphoto detector. In this paper, it is shown that the intensity undulations in mechanicallychopped laser pulses are produced by diffraction of light from the rotating disc, and adetailed explanation is given of the intensity undulations in mechanically chopped laserpulses. An experiment presented in this paper provides an efficient method to capture aone dimensional diffraction profile of light from a straight sharp-edge in the timedomain. In addition, the experiment accurately measures wavelengths of three differentlaser beams from the undulations in mechanically chopped laser light pulses. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The American Journal of Physics American Association of Physics Teachers

Diffraction effects in mechanically chopped laser pulses

Loading next page...
 
/lp/aapt/diffraction-effects-in-mechanically-chopped-laser-pulses-0f0yTQSMLG
Publisher
American Association of Physics Teachers
Copyright
© 2018 American Association of Physics Teachers.
ISSN
0002-9505
D.O.I.
10.1119/1.5029821
Publisher site
See Article on Publisher Site

Abstract

A mechanical beam chopper consists of a rotating disc of regularly spaced wide slitswhich allow light to pass through them. A continuous light beam, after passing through therotating disc, is switched-on and switched-off periodically, and a series of opticalpulses are produced. The intensity of each pulse is expected to rise and fall smoothlywith time. However, a careful study has revealed that the edges of mechanically choppedlaser light pulses consist of periodic intensity undulations which can be detected with aphoto detector. In this paper, it is shown that the intensity undulations in mechanicallychopped laser pulses are produced by diffraction of light from the rotating disc, and adetailed explanation is given of the intensity undulations in mechanically chopped laserpulses. An experiment presented in this paper provides an efficient method to capture aone dimensional diffraction profile of light from a straight sharp-edge in the timedomain. In addition, the experiment accurately measures wavelengths of three differentlaser beams from the undulations in mechanically chopped laser light pulses.

Journal

The American Journal of PhysicsAmerican Association of Physics Teachers

Published: Jun 25, 2018

There are no references for this article.

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off