title: Design of a lithium niobate Fabry-Perot étalon-based spectrometer.
abstract: The design of a tunable Fabry-Perot étalon-based filter that has a passband of 0.01 nm and a free spectral band larger than 50 nm when operated in the center of the visible spectrum is described. The filter consists of two Y-cut lithium niobate étalons having thicknesses in a vernier ratio. The polarization state of light passing through the tandem étalons is rotated 90 degrees before again being transmitted through the étalon pair. If the components are arranged in a symmetrical manner, the filter will operate with unpolarized incident light. Each étalon in double pass will have a greater transmittance than two individual étalons of the same average optical thicknesses, since variations in the physical thickness due to fabrication errors are correlated.
authors.forename: R P
authors.initials: RP
authors.lastname: Netterfield
authors.forename: C H
authors.initials: CH
authors.lastname: Freund
authors.forename: J A
authors.initials: JA
authors.lastname: Seckold
authors.forename: C J
authors.initials: CJ
authors.lastname: Walsh