title: Generation of a phase-locked Raman frequency comb in gas-filled hollow-core photonic crystal fiber.
abstract: In a relatively simple setup consisting of a microchip laser as pump source and two hydrogen-filled hollow-core photonic crystal fibers, a broad, phase-locked, purely rotational frequency comb is generated. This is achieved by producing a clean first Stokes seed pulse in a narrowband guiding photonic bandgap fiber via stimulated Raman scattering and then driving the same Raman transition resonantly with a pump and Stokes fields in a second broadband guiding kagomé-style fiber. Using a spectral interferometric technique based on sum frequency generation, we show that the comb components are phase locked.
authors.affiliation: Max Planck Institute for the Science of Light, Erlangen, Germany. amir.abdolvand@mpl.mpg.de
authors.forename: A
authors.initials: A
authors.lastname: Abdolvand
authors.forename: A M
authors.initials: AM
authors.lastname: Walser
authors.forename: M
authors.initials: M
authors.lastname: Ziemienczuk
authors.forename: T
authors.initials: T
authors.lastname: Nguyen
authors.forename: P St J
authors.initials: PS
authors.lastname: Russell