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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1994),
  • paper CWH5

Sodium vapor dispersive Faraday filter for daytime lidar operation

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Abstract

Narrowband filters are necessary in free-space optical communication to extract a weak narrowband signal in the presence of a broadband optical background. Conventional interference filters can not provide extremely narrow bandwidth (0.01-1Å) with a highly stable transmission peak and a reasonably large field-of-view. The idea of using a circularly birefringent, dichroic medium between crossed polarizers as such a filter, first introduced and demonstrated by Ohman,1 has recently been revived and actively pursued for laser-based applications.

© 1994 Optical Society of America

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