title: 10 kHz accuracy of an optical frequency reference based on (12)C2H2-filled large-core kagome photonic crystal fibers.
abstract: Saturated absorption spectroscopy reveals the narrowest features so far in molecular gas-filled hollow-core photonic crystal fiber. The 48-68 mum core diameter of the kagome-structured fiber used here allows for 8 MHz full-width half-maximum sub-Doppler features, and its wavelength-insensitive transmission is suitable for high-accuracy frequency measurements. A fiber laser is locked to the (12)C2H2 nu(1); + nu(3) P(13) transition inside kagome fiber, and compared with frequency combs based on both a carbon nanotube fiber laser and a Cr:forsterite laser, each of which are referenced to a GPS-disciplined Rb oscillator. The absolute frequency of the measured line center agrees with those measured in power build-up cavities to within 9.3 kHz (1 sigma error), and the fractional frequency instability is less than 1.2 x 10(-11) at 1 s averaging time.
authors.affiliation: Kansas State University, 116 Cardwell Hall, Manhattan, KS 66506, USA. corwin@phys.ksu.edu
authors.forename: Kevin
authors.initials: K
authors.lastname: Knabe
authors.forename: Shun
authors.initials: S
authors.lastname: Wu
authors.forename: Jinkang
authors.initials: J
authors.lastname: Lim
authors.forename: Karl A
authors.initials: KA
authors.lastname: Tillman
authors.forename: Philip S
authors.initials: PS
authors.lastname: Light
authors.forename: Francois
authors.initials: F
authors.lastname: Couny
authors.forename: Natalie
authors.initials: N
authors.lastname: Wheeler
authors.forename: Rajesh
authors.initials: R
authors.lastname: Thapa
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Jones
authors.forename: Jeffrey W
authors.initials: JW
authors.lastname: Nicholson
authors.forename: Brian R
authors.initials: BR
authors.lastname: Washburn
authors.forename: Fetah
authors.initials: F
authors.lastname: Benabid
authors.forename: Kristan L
authors.initials: KL
authors.lastname: Corwin