title: Terahertz bandwidth RF spectrum analysis of femtosecond pulses using a chalcogenide chip.
abstract: We report the first demonstration of the use of an RF spectrum analyser with multi-terahertz bandwidth to measure the properties of femtosecond optical pulses. A low distortion and broad measurement bandwidth of 2.78 THz (nearly two orders of magnitude greater than conventional opto-electronic analyzers) was achieved by using a 6 cm long As(2)S(3) chalcogenide waveguide designed for high Kerr nonlinearity and near zero dispersion. Measurements of pulses as short as 260 fs produced from a soliton-effect compressor reveal features not evident from the pulse's optical spectrum. We also applied an inverse Fourier transform numerically to the captured data to re-construct a time-domain waveform that resembled pulse measurement obtained from intensity autocorrelation.
authors.affiliation: ARC Centre for Ultrahigh bandwidth Devices for Optical Systems, Institute of Photonics and Optical Science, School of Physics, University of Sydney, New South Wales 2006, Australia. m.pelusi@physics.usyd.edu.au
authors.forename: M D
authors.initials: MD
authors.lastname: Pelusi
authors.forename: T D
authors.initials: TD
authors.lastname: Vo
authors.forename: F
authors.initials: F
authors.lastname: Luan
authors.forename: S J
authors.initials: SJ
authors.lastname: Madden
authors.forename: D-Y
authors.initials: DY
authors.lastname: Choi
authors.forename: D A P
authors.initials: DA
authors.lastname: Bulla
authors.forename: B
authors.initials: B
authors.lastname: Luther-Davies
authors.forename: B J
authors.initials: BJ
authors.lastname: Eggleton
mesh_terms: D018011:Chalcogens / Q000737:chemistry*; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D011846:Radio Waves; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D055053:Terahertz Radiation; D055068:Terahertz Spectroscopy / Q000295:instrumentation* / Q000379:methods*
chemical_list: D018011:Chalcogens