The 771 Series Laser Spectrum Analyzers from Bristol Instruments operate from 375 nm to 12 µm. These systems combine proven Michelson interferometer-based technology with fast Fourier transform analysis for accurate measurement of absolute wavelength to ± 0.0001 nm and high resolution spectral analysis to 2 GHz and an optical rejection ratio (ORR) of more than 40 dB. Two versions are available - model 771A is the most precise, measuring wavelength to an accuracy of ± 0.2 parts per million (± 0.0002 nm at 1000 nm), model 771B is a lower-priced alternative with an accuracy of ± 0.75 parts per million (± 0.0008 nm at 1000 nm).
They are available in four broad wavelength configurations to satisfy virtually any experimental requirement. These ranges are the VIS (375 - 1100 nm), NIR (520 - 1700 nm), IR (1 - 5 µm), and MIR (1.5 - 12 µm). The system operates with CW lasers, and a special measurement algorithm enables operation with pulsed lasers that have a repetition rate greater than 50 kHz and a pulse length of more than 50 ns.