Laser Frequency/Wavelength

The ORNL Metrology Laboratory (ORNLML) maintains an intrinsic Iodine-stabilized laser frequency and wavelength standard for certifying the frequency and/or wavelength of Helium-Neon (HeNe) lasers.  HeNe lasers are typically used for dimensional measurements and velocity/speed measurements using laser interferometers.  The frequency/wavelength of the laser is a contributor to the uncertainty of dimensional measurements using laser interferometry and must be considered when establishing traceability of laser interferometers.   The ORNL Metrology Laboratory can also provide calibration for other applications where knowledge of the frequency/wavelength of HeNe lasers is important. The ORNLML is accredited by the National Voluntary Laboratory Accreditation Program (NVLAP) for laser wavelength over the range of 632.991011 to 632.991595nm with an uncertainty of 0.09 parts in 10⁹,K=2.