Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Optical coherence modulation by ultrasonic waves. 2: Application to speckle reduction

Not Accessible

Your library or personal account may give you access

Abstract

Laser light, which is doubly phase modulated by an ultrasonic wave, can be utilized for speckle reduction. The double phase modulation is found to be more effective for speckle reduction than single phase modulation, since the doubly modulated laser beam for illumination is much degraded in spatial coherence with the same ultrasonic conditions. Average contrast is discussed analytically and experimentally as a measure of image-speckle reduction. Agreement between the measured and calculated results are recognized to the extent that the ultrasonic wave can be regarded as a pure phase grating. The average contrasts for two kinds of diffuser decrease similarly down to a minimum of ~0.4 by increasing the ultrasonic power.

© 1980 Optical Society of America

Full Article  |  PDF Article
More Like This
Partial coherence controlled by a progressive ultrasonic wave

Yoshihiro Ohtsuka and Yoh Imai
J. Opt. Soc. Am. 69(5) 684-689 (1979)

Modulation of optical coherence by ultrasonic waves

Yoshihiro Ohtsuka
J. Opt. Soc. Am. A 3(8) 1247-1257 (1986)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (10)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved