- Frequency Addition Source of Optical Radiation
physics, a FASOR is an acronym for Frequency Addition Source of Optical Radiation. It is a device similar to a laserwhere the emitted light is produced in a sum-frequency generation process from two laser sources that operate at a different wavelength. The "frequencies" of the sources add directly to a summed frequency. Thus, if the source wavelengths are and , the resulting wavelength is:
The FASOR in the image is used for
laser guide starexperiments. It is tuned to D2A hyperfinecomponent of the sodium D line and used to excite sodiumatoms in the mesospheric upper atmosphere. It consists of single frequency injection locked lasers close to 1064 and 1319 nm that are both resonantin a cavity containing a Lithium Triborate(LBO) crystal which sums the frequencies yielding 589.158 nm light.
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