spectroscopy

Single molecule spectroscopy using tunable lasers

The fluorescence excitation spectra of single organic molecules in a solid state crystal are measured at cryogenic temperatures using a single frequency tunable laser light source based on optical parametric oscillator technology. This laser exhibits promising features as a light source for spectroscopy applications, including a broad tuning range from 450 to 650 nm, narrow linewidth < 1 MHz and mode-hop-free tuning over > 25 GHz. This application note presents the experimental setup, measured spectra and discusses the applicability of this kind of laser for high-resolution spectroscopy.

FEATURE

Through the barrel

Andrew Williams finds that optical technologies are now recognised as critical tools in the ongoing quest to test and identify contaminants in alcohol, and tackle problems related to the trade in counterfeit drinks