Widely tunable continuous wave optical parametric oscillators (cw OPOs) are gaining popularity as novel sources oftunable laser light, not least due to the unprecedented wavelength coverage in the visible and the near infrared spectralrange. While the potential and the advantages of tunable cw OPOs are becoming increasingly recognized, in particularwithin the quantum research community, the experimental requirements are often challenging. In this context, we discussthe characteristics of state-of-the-art tunable cw OPO designs and describe several tuning schemes tailored to meetvarious experimental needs. In an illustrative fashion, we compare several recently published experimental datasets fromphotoluminescence excitation experiments, which have been carried out on ensembles as well as on individual quantumemitters under different experimental conditions.
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