Frequency addition source of optical radiation

Frequency addition source of optical radiation (acronym FASOR) is used for a certain type of guide star laser deployed at US Air Force Research Laboratory facilities SOR and AMOS.

, the resulting wavelength is The FASOR was initially used for many laser guide star experiments.

[1][2] These have ranged from mapping the photon return verse wavelength, power, and pointing location in the sky.

[4] It has also been used for its intended application of generating a laser guidestar for adaptive optics, see first reference.

The FASOR consists of two single-frequency injection-locked Nd:YAG lasers close to 1064 and 1319 nm that are both resonant in a cavity containing a lithium triborate (LBO) crystal, which sums the frequencies yielding 589.159 nm light.