title: Non-resonant wavelength modulation saturation spectroscopy in acetylene-filled hollow-core photonic bandgap fibres applied to modulation-free laser diode stabilisation.
abstract: In this paper the application of Wavelength Modulation (WM) techniques to non-resonant saturation spectroscopy in acetylene-filled Hollow-Core Photonic Bandgap Fibres (HC-PBFs) and modulation-free Laser Diode (LD) frequency stabilisation is investigated. In the first part WM techniques are applied to non-resonant pump-probe saturation of acetylene overtone rotational transitions in a HC-PBF. A high-power DFB chip-on-carrier mounted LD is used in conjunction with a tuneable External Cavity Laser (ECL) and the main saturation parameters are characterized. In the second part a novel feedback system to stabilize the DFB emission wavelength based on the WM saturation results is implemented. Modulation-free locking of the DFB laser frequency to the narrow linewidth saturation feature is achieved for both constant and variable LD temperatures.
authors.affiliation: Semiconductor Photonics Group, School of Physics, Trinity College Dublin, Ireland. pinedavp@tcd.ie
authors.forename: Pablo
authors.initials: P
authors.lastname: Pineda-Vadillo
authors.forename: Michael
authors.initials: M
authors.lastname: Lynch
authors.forename: Christy
authors.initials: C
authors.lastname: Charlton
authors.forename: John F
authors.initials: JF
authors.lastname: Donegan
authors.forename: Vincent
authors.initials: V
authors.lastname: Weldon
mesh_terms: D000114:Acetylene / Q000737:chemistry* / Q000528:radiation effects; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D054023:Lasers, Semiconductor; D017785:Photons; D013057:Spectrum Analysis / Q000295:instrumentation*
chemical_list: D000114:Acetylene