title: Second-order optical filter based on a mirrored gradient index lens.
abstract: We demonstrate a second-order bandpass filter using a single gradient index lens (GRIN) coated with mirrors. The filter becomes possible because of the residual and externally introduced small birefringence of the GRIN lens material. We show that the filter function can be trimmed by mechanical strain of the lens. Applications of the filter in microwave photonics are discussed.
authors.affiliation: OEwaves Inc., 2555 East Colorado Boulevard, Pasadena, California 91107, USA.
authors.forename: W
authors.initials: W
authors.lastname: Liang
authors.forename: A A
authors.initials: AA
authors.lastname: Savchenkov
authors.forename: A B
authors.initials: AB
authors.lastname: Matsko
authors.forename: V S
authors.initials: VS
authors.lastname: Ilchenko
authors.forename: D
authors.initials: D
authors.lastname: Seidel
authors.forename: L
authors.initials: L
authors.lastname: Maleki