Applied Physics Letters · 1973 · 215 citations · 15 references
Thz PhotonicsEngineeringLaser ScienceLaser ApplicationsLaser PhysicsAbsorption SpectroscopyAccurate FrequenciesChemistrySpectra-structure CorrelationOptical PropertiesLaser StabilizationMolecular SpectroscopyMolecular TransitionsPhotonicsPhysicsInfrared SpectroscopyLaser SpectroscopyPhysical ChemistryQuantum ChemistryInfrared-frequency Synthesis ChainMolecular AbsorptionsMicrowave SpectroscopyCesium Frequency StandardLaser PhotochemistryNatural SciencesSpectroscopyApplied PhysicsTunable Lasers
The frequencies of three lasers stabilized to molecular absorptions were measured with an infrared-frequency synthesis chain extending upwards from the cesium frequency standard. The measured values are 29.442 483 315 (25) THz for the 10.18-μm R(30) transition in CO2, 32.134 266 891 (24) THz for the 9.33-μm R(10) transition in CO2, and 88.376 181 627 (50) THz for the 3.39-μm P(7) transition in CH4. The frequency of methane, when multiplied by the measured wavelength reported in the following letter, yields 299 792 456.2(1.1) m/sec for the speed of light.
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