title: Supercontinuum up-conversion via molecular modulation in gas-filled hollow-core PCF.
abstract: We report on the efficient, tunable, and selective frequency up-conversion of a supercontinuum spectrum via molecular modulation in a hydrogen-filled hollow-core photonic crystal fiber. The vibrational Q(1) Raman transition of hydrogen is excited in the fiber by a pump pre-pulse, enabling the excitation of a synchronous, collective oscillation of the molecules. This coherence wave is then used to up-shift the frequency of an arbitrarily weak, delayed probe pulse. Perfect phase-matching for this process is achieved by using higher order fiber modes and adjusting the pressure of the filling gas. Conversion efficiencies of ~50% are obtained within a tuning range of 25 THz.
authors.forename: S T
authors.initials: ST
authors.lastname: Bauerschmidt
authors.forename: D
authors.initials: D
authors.lastname: Novoa
authors.forename: B M
authors.initials: BM
authors.lastname: Trabold
authors.forename: A
authors.initials: A
authors.lastname: Abdolvand
authors.forename: P St J
authors.initials: PS
authors.lastname: Russell