The fluorescence excitation spectra of single organic molecules in a solid-state crystal are measured at cryogenic temperatures at the Max Planck Institute for the Science of Light in Erlangen, Germany. As a tunable laser light source, the optical parametric oscillator C-WAVE is employed. C-WAVE exhibits promising features as a laser light source for spectroscopy applications, like a broad tuning range from 450 to 650 nm, a narrow linewidth <1 MHz, and mode-hopfree tuning >25 GHz. This report presents the experimental set-up and measured spectra, and it discusses the applicability of C-WAVE for high-resolution spectroscopy.

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