title: Moiré volume Bragg grating filter with tunable bandwidth.
abstract: We propose a monolithic large-aperture narrowband optical filter based on a moiré volume Bragg grating formed by two sequentially recorded gratings with slightly different resonant wavelengths. Such recording creates a spatial modulation of refractive index with a slowly varying sinusoidal envelope. By cutting a specimen at a small angle, to a thickness of one-period of this envelope, the longitudinal envelope profile will shift from a sine profile to a cosine profile across the face of the device. The transmission peak of the filter has a tunable bandwidth while remaining at a fixed resonant wavelength by a transversal shift of incidence position. Analytical expressions for the tunable bandwidth of such a filter are calculated and experimental data from a filter operating at 1064 nm with bandwidth range 30-90 pm is demonstrated.
authors.forename: Sergiy
authors.initials: S
authors.lastname: Mokhov
authors.forename: Daniel
authors.initials: D
authors.lastname: Ott
authors.forename: Ivan
authors.initials: I
authors.lastname: Divliansky
authors.forename: Boris
authors.initials: B
authors.lastname: Zeldovich
authors.forename: Leonid
authors.initials: L
authors.lastname: Glebov