Properties of phase-shifted, chirped volume Bragg gratings

Phase-shifted volume Bragg gratings with high transmission peak and diffraction efficiency have been realized via interferometric phase-mask technique using PTR glass. This technique enables exotic configurations beyond that of a phase-shifted reflection Bragg grating. When the phase-shift is encoded into a chirped grating, a wavelength-tunable narrow-line filter element is generated. Transversally and longitudinally chirped, π-phase-shifted gratings have been fabricated and their properties and potential uses are explored.