title: In-fiber Mach-Zehnder interferometer for gas refractive index measurements based on a hollow-core photonic crystal fiber.
abstract: We describe an in-fiber interferometer based on a gas-filled hollow-core photonic crystal fiber. Expressions for the sensitivity, figure of merit and refractive index resolution are derived, and values are experimentally measured and theoretically validated using mode field calculations. The refractive indices of nine monoatomic and molecular gases are measured with a resolution of δns< 10-6.
authors.forename: Nicholas L P
authors.initials: NL
authors.lastname: Andrews
authors.forename: Rachel
authors.initials: R
authors.lastname: Ross
authors.forename: Dorit
authors.initials: D
authors.lastname: Munzke
authors.forename: Camiel
authors.initials: C
authors.lastname: van Hoorn
authors.forename: Andrew
authors.initials: A
authors.lastname: Brzezinski
authors.forename: Jack A
authors.initials: JA
authors.lastname: Barnes
authors.forename: Oliver
authors.initials: O
authors.lastname: Reich
authors.forename: Hans-Peter
authors.initials: HP
authors.lastname: Loock