Up to the present time no image-forming depolarizing filter has been described which will work for monochromatic light. This paper describes a simple monochromatic depolarizer. This depolarizer consists of two variable wave plates whose axes are separated by an angle of 45°. The retardation of the first wave plate varies from zero to 2π. The second wave plate varies from zero to 4π. This variation is made to occur in a time which is short compared to the time constant of the apparatus in which the depolarizer is used. Typical components are Z cut plates of ammonium-dihydrogen-phosphate. The retardation of these plates can be made to vary by applying an electric field along the optic axis.
A discussion is also given of the Lyot depolarizer which is effective for light which covers a wide wavelength range. Tolerances are derived for the behavior of the Lyot depolarizer and experimental measurements are shown of its behavior.
© 1951 Optical Society of AmericaFull Article | PDF Article
OSA Recommended Articles
Gabriel Biener, Avi Niv, Vladimir Kleiner, and Erez Hasman
Opt. Lett. 28(16) 1400-1402 (2003)
Ismo Vartiainen, Jani Tervo, and Markku Kuittinen
Opt. Lett. 34(11) 1648-1650 (2009)
Bruce H. Billings
J. Opt. Soc. Am. 39(10) 802-808 (1949)