High spectral contrast filtering produced by multiple pass reflections from paired Bragg gratings in PTR glass

Daniel Ott; Marc SeGall; Ivan Divliansky; George Venus; Leonid Glebov

doi:10.1117/12.2039700

7 March 2014 High spectral contrast filtering produced by multiple pass reflections from paired Bragg gratings in PTR glass

Daniel Ott, Marc SeGall, Ivan Divliansky, George Venus, Leonid Glebov

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Proceedings Volume 8982, Optical Components and Materials XI; 898210 (2014) https://doi.org/10.1117/12.2039700
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

The properties of multiple reflections from narrow bandwidth reflection Bragg gratings are presented. The use of multiple reflections serves to increase the suppression ratio of the out-of-band spectral content such that contributions of grating sidelobes can be mitigated. The result is a device which retains spectral and angular selectivity in a single high efficiency diffraction order but reshapes spectral/angular response to achieve higher signal to noise ratios (SNR). The material for recording these high suppression devices is photo-thermo-refractive (PTR) glass. PTR is a highly homogeneous photosensitive glass with features such as low losses and high laser damage threshold. It has recently been used with good success to record permanent volume Bragg gratings with high efficiency and narrow band selectivity for use in laser cavities. Multiple reflections from the grating surface are achieved using several different arrangements. The multiple pass grating reflections are demonstrated and compared to the performance of a single reflection from a volume Bragg grating.

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Daniel Ott, Marc SeGall, Ivan Divliansky, George Venus, and Leonid Glebov "High spectral contrast filtering produced by multiple pass reflections from paired Bragg gratings in PTR glass", Proc. SPIE 8982, Optical Components and Materials XI, 898210 (7 March 2014); https://doi.org/10.1117/12.2039700

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KEYWORDS

Reflection

Fiber Bragg gratings

Optical filters

Glasses

Reflectivity

Mirrors

Signal to noise ratio

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