title: High-contrast filtering by multipass diffraction between paired volume Bragg gratings.
abstract: High-contrast filtering via multiple reflections between matched volume Bragg gratings (VBGs) is demonstrated. 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 that retains spectral and angular selectivity and diffracts light into a single order with high efficiency but reshapes the spectral/angular response to achieve higher signal-to-noise ratios. We demonstrate that multipass spectral filters can be recorded with extremely high suppression ratios using reflecting Bragg gratings (RBGs) in three different configurations. These filters demonstrate roll-offs of over 150 dB/nm. Similarly, we demonstrate angular filtering by multipass transmitting gratings.
authors.forename: Daniel
authors.initials: D
authors.lastname: Ott
authors.forename: Marc
authors.initials: M
authors.lastname: SeGall
authors.forename: Ivan
authors.initials: I
authors.lastname: Divliansky
authors.forename: George
authors.initials: G
authors.lastname: Venus
authors.forename: Leonid
authors.initials: L
authors.lastname: Glebov