title: Time-resolved measurement shows a spectral distribution shift in an intense pulsed light system.
abstract: For an intense pulsed light (IPL) device, knowledge of the spectral output is useful in order to provide effective treatment and target specific structures in the skin. It is also a requirement in order to perform a safety assessment. A novel spectral measurement system has been developed to detect the optical radiation output of intense pulsed light devices. The system has a time resolution of 450 mus and a wavelength resolution of 0.6 nm. This enabled us to observe spectral changes, both within a pulse and between pulses, in a pulse train. The output from a free discharge IPL source and four different treatment handpieces was measured. A shift in the spectral distribution between pulses, and within a pulse, was discovered. The spectral shift is more prominent for higher radiant exposures.
authors.affiliation: University of Dundee Photobiology Unit, Ninewells Hospital and Medical School, Dundee, DD1 9SY, UK. e.d.eadie@dundee.ac.uk
authors.forename: Ewan
authors.initials: E
authors.lastname: Eadie
authors.forename: Paul
authors.initials: P
authors.lastname: Miller
authors.forename: Teresa
authors.initials: T
authors.lastname: Goodman
authors.forename: Harry
authors.initials: H
authors.lastname: Moseley
mesh_terms: D055095:Optics and Photonics; D010789:Phototherapy; D013057:Spectrum Analysis