The Birefringent Filter

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Abstract:

The basic principles of birefringent filter operation are briefly discussed and references given to papers which discuss the theory. Off-axis effects are investigated as well as field of view limitations, and methods for extending the field of view are considered. The split element filter is described it uses only half as many polarizers as a conventional filter, after the first polarization. Wave length adjustment possibilities are evaluated for conventional and split element filters. The usefulness of various crystal materials is mentioned. Finally, the polarization interferometer is discussed as a way of accomplishing the narrow-band transmission of an impossibly thick birefringent filter element. Several possible forms of interferometer are mentioned.

Author(s):
Evans, John W. ; Roberts, Walter O.
Author Organization(s):
HIGH ALTITUDE OBSERVATORY BOULDER CO
Descriptive Note:
Special rept.
Pagination:
0040

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
N8ONR-648(01)
Project Number(s):
NR-015-801, NR-046-708
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_6_Net Centric; JCA_6.3.3_Spectrum Management; JCA_6.1_Information Transport; JCA_6.3_Net Management
Modernization Areas:
Directed Energy; Microelectronics
Communities of Interest:
Air Platforms
Descriptor(s):
*OPTICAL FILTERS, OPTICAL PROPERTIES, INTERFEROMETERS, POLARIZING FILTERS, BIREFRINGENCE
Field(s)/Group(s):
Astronomy, Optics
Keyword(s):
*ASTRONOMICAL INSTRUMENTS
Report Date:
1948 Dec 01