A 50W FASOR used at the Starfire Optical Range

In physics, a FASOR is an acronym for Frequency Addition Source of Optical Radiation. It is a device similar to a laser where the emitted light is produced in a sum-frequency generation process from two laser sources that operate at a different wavelength. If the source wavelengths are λ₁ and λ₂, the resulting wavelength is Image File history File linksMetadata Download high resolution version (2000x3008, 4406 KB) Original caption: Though the caption states that this is a sodium laser, this is actually misleading as the lasing medium in the Starfire Optical Range LIDAR laser seen here is really a dye laser which is tuned to... Image File history File linksMetadata Download high resolution version (2000x3008, 4406 KB) Original caption: Though the caption states that this is a sodium laser, this is actually misleading as the lasing medium in the Starfire Optical Range LIDAR laser seen here is really a dye laser which is tuned to... The Starfire Optical Range, as viewed from a helicopter. ... Physics (Greek: (phúsis), nature and (phusiké), knowledge of nature) is the science concerned with the fundamental laws of the universe. ... Experiment with a laser (likely an argon type) (US Military) In physics, a laser is a device that emits light through a specific mechanism for which the term laser is an acronym: light amplification by stimulated emission of radiation. ... Nonlinear optics is the branch of optics that describes the behaviour of light in nonlinear media, that is, media in which the polarization P responds nonlinearly to the electric field E of the light. ...

Applications

The FASOR in the image is used for laser guide star experiments. It is tuned to D2A hyperfine component of the sodium D line and used to excite sodium atoms in the mesospheric upper atmosphere. It consists of 1064 nm and 1319 nm Nd:YAG single frequency injection locked lasers that are both resonant in a cavity containing a Lithium Triborate (LBO) crystal which sums the frequencies yielding 589.158 nm light. Lick Observatory laser guide star, built by LLNL. Laser guide stars are a form of artificial star created for use in astronomical adaptive optics imaging. ... Hyperfine structure is a small perturbation in the energy levels (or spectral) of atoms due to the proton-electron dipole moment interaction. ... Solar Fraunhofer lines In physics and optics, the Fraunhofer lines are a set of spectral lines named for the German physicist Joseph von Fraunhofer (1787--1826). ... General Name, Symbol, Number sodium, Na, 11 Chemical series alkali metals Group, Period, Block 1, 3, s Appearance silvery white Atomic mass 22. ... A dye laser used at the Starfire Optical Range for LIDAR and laser guide star experiments is tuned to the sodium D line and used to excite sodium atoms in the upper atmosphere. ... Acronym for Neodymium-doped Yttrium Aluminum Garnet, a compound that is used as the lasing medium for certain solid-state lasers. ... This article is about resonance in physics. ... Lithium triborate (LiB3O5, or LBO) is a non-linear optics crystal. ...