Operation with CW and pulsed lasers
The 772B-MIR Laser Spectrum Analyzer combines proven Michelson interferometer technology with fast Fourier transform analysis to characterize the spectral properties of CW and pulsed lasers that operate from 1 to 12 μm.
When used with CW lasers, the model 772B-MIR operates and performs just like Bristol’s 771B-MIR Laser Spectrum Analyzer. What makes the 772B-MIR system unique is that it employs a sophisticated algorithm to enable the measurement of pulsed lasers that have a repetition rate as low as 50 Hz.
Pulsed laser operation
When used with pulsed lasers, a single scan of the Michelson interferometer does not generate an interferogram that is sufficient to convert to a spectrum. Therefore, data from a number of laser pulses are collected from multiple scans of the interferometer to “build” a more complete interferogram.
Spectral analysis and wavelength measurement
The 772B-MIR Laser Spectrum Analyzer has a spectral resolution of 4 GHz and wavelength accuracy of ± 10 parts per million (± 0.08 nm at 8 μm). An optical rejection ratio of about 15 - 20 dB is achieved assuming a sufficient number of laser pulses (≥ 30,000) are used to generate the interferogram.
The 771 Laser Spectrum Analyzer operates with a PC connected directly by USB or through a local area network via Ethernet. Software is provided to control measurement parameters, display spectra, and to report wavelength data.
Spectrum of QCL with a pulse rate of 50 Hz and a pulse length of 50 ns.