spectroscopy

Single molecule spectroscopy using tunable lasers

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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.

The full spectrum

David Creasey details Wasatch Photonics’ history with Jessica Rowbury and discusses the challenges and opportunities going forwards

Tunable, narrow bandwidth mid-IR laser sources for compact trace gas analysis systems with ppb sensitivity

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The ultimate instrumentation for trace gas analysis and detection in air quality monitoring as well as industrial process control would be one that can simultaneously provide a sensitive, selective, and fast, multi-gas measurement with wide dynamic range all in a compact and robust system. One of the few such promising technologies that can deliver these requirements is laser based photoacoustic spectroscopy (PAS).

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