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Proceedings Paper

Ultra-narrow bandpass filters based on volume Bragg grating technologies
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Paper Abstract

Free space optical communication between movable platforms, especially communication with non-cooperative targets, requires detecting low intensity signals in conditions of multiple sources of contaminating signals. In this paper, we review recent achievements in ultra-narrow bandpass filters based on volume Bragg gratings (VBGs) recorded in the bulk of photo-thermo-refractive glass. The new types of transmission filters show unique characteristics such as high throughput and bandwidths as narrow as a few picometers at any wavelength from 500 to 2700 nm. The first filter type is formed by the incoherent combination of a Fabry-Perot etalon and a VBG that enables tunable ultra-narrow band transmission with a single resonance. The filters demonstrate a bandwidth down to a few picometers at 1064 nm, a transmission exceeding 90%, an ultra-broad rejection band (several hundreds of nanometers), and an extinction ratio better than 30 dB. The second filter type is based on multiplexed frequency shifted VBGs that form a volumetric Moiré Bragg grating. The filter provides a single resonance with transmission higher than 90% in the middle of the reflection lobe of the VBG, a bandwidth down to a few picometers and high mechanical stability. Both types of ultra-narrow bandpass filters can be used for many applications requiring to transmit a single frequency and to reject other adjacent frequencies, e.g., in Lidars, or for selection of longitudinal modes in laser resonators. The new filters provide a significant advantage in terms of stability, tunability and achievable throughput for a given bandwidth.

Paper Details

Date Published: 20 April 2010
PDF: 9 pages
Proc. SPIE 7675, Photonics in the Transportation Industry: Auto to Aerospace III, 76750H (20 April 2010); doi: 10.1117/12.852637
Show Author Affiliations
Julien Lumeau, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Vadim Smirnov, OptiGrate Corp. (United States)
Alexei Glebov, OptiGrate Corp. (United States)
Leonid B. Glebov, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 7675:
Photonics in the Transportation Industry: Auto to Aerospace III
Alex A. Kazemi; Bernard C. Kress; Eric Y. Chan, Editor(s)

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