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Proceedings Paper

Stable and tunable performance of ultra-narrow bandpass and high edge slope dichroic optical filters
Author(s): Markus Fredell; Thomas Rahmlow Jr.; William Cote; Robert Mann; Robert Johnson Jr.
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Paper Abstract

Laser based applications including optical communications, LIDAR and Raman spectroscopy benefit from ultra-narrow (< 1.0 nm) bandpass and high edge slope dichroic optical filters by rejecting off-band ambient and scattered light. However, applications for these filters are limited by shifts in wavelength due to temperature and angle of incidence, system f-number, doppler shift and pointing error of the gimbal as well as the stability of the source. Passive design techniques such as athermalization, use of high refractive index materials and widening the passband are compared with active tuning options. Adding thermal or tilt tuning can expand the operational range of the filter and mitigate the compromise to signal to noise which follows from widening the passband.

Paper Details

Date Published: 2 March 2020
PDF: 8 pages
Proc. SPIE 11272, Free-Space Laser Communications XXXII, 112721F (2 March 2020); doi: 10.1117/12.2547866
Show Author Affiliations
Markus Fredell, Omega Optical, Inc. (United States)
Thomas Rahmlow Jr., Omega Optical, Inc. (United States)
William Cote, Omega Optical, Inc. (United States)
Robert Mann, Omega Optical, Inc. (United States)
Robert Johnson Jr., Omega Optical, Inc. (United States)

Published in SPIE Proceedings Vol. 11272:
Free-Space Laser Communications XXXII
Hamid Hemmati; Don M. Boroson, Editor(s)

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