Nonlinear crystals — commonly used to double or triple the frequency of laser light or create tunable light sources called optical parametric oscillators (OPOs) — have been in use for decades ...

the frequency comb is used as a light source to probe molecules or atoms under investigation. In OFC-assisted spectroscopy, the comb is used as a stable optical frequency reference, in order to ...

The approach uses high-frequency sound waves ... or even to track multiple markers at once with a single light source. “However, although acousto-optics is a fast and flexible approach ...