BRISTOL INSTRUMENTS’ wavelength meters provide accurate information for scientists and engineers who need to know the exact wavelength of their lasers. These systems use proven Michelson or Fizeau interferometer-based technology to measure absolute wavelength to a guaranteed accuracy as high as ±0.0001 nm. To achieve the reliable accuracy that is expected from Bristol Instruments, all of its wavelength meters include a built-in wavelength standard for continuous calibration. Systems are available for CW and pulsed lasers that operate at wavelengths from 350 nm to 12 µm. They are used for scientific applications at universities, government laboratories, and industry, and for the testing of WDM components and systems used for fiber communications.