871 Series Laser Wavelength Meter


Accurate wavelength measurement of pulsed and CW lasers

The 871 Laser Wavelength Meter uses a proven Fizeau etalon design to measure the absolute wavelength of pulsed and CW lasers to an accuracy of ± 0.2 parts per million (± 0.0002 nm at 1000 nm). This performance is maintained over long periods of time because the system is automatically calibrated with a built-in wavelength standard. In addition, the laser under test enters the model 871 through a pre-aligned fiber-optic input connector. This input method eliminates the need to visually inspect and optimize the interference patterns generated by the system's etalons and therefore results in uncompromised accuracy.  


Fastest sustained wavelength measurement available

The 871 Laser Wavelength Meter's Fizeau etalon design generates a spatial interferogram that is detected by a fast photodetector array. An on-board digital signal processor quickly converts the interferometric information to wavelength. Because this calculation is done internally, a sustained measurement rate as high as 1 kHz is achieved. In addition, wavelength measurements can be reported at this rate by data streaming with an RS-422 serial interface, or an internal data buffer is available to save up to one million measurements. 


Broad wavelength coverage and straightforward operation

The 871 Laser Wavelength Meter is available in three broad wavelength configurations to satisfy many experimental requirements. These are designated as the VIS (375 – 1100 nm), NIR (630 – 1700 nm), and NIR2 (1 – 2.5 μm) wavelength ranges. The system operates with a PC, running under Windows, via USB or Ethernet. Software is provided to control the measurement parameters to report data, or the system can become part of an experiment using a library of commands for custom or LabVIEW programming. In addition, a browser based application can be used with a tablet or smart phone to display laser wavelength information anywhere in the laboratory. 

Fastest, most reliable method to accurately measure the wavelength of pulsed and CW lasers.

  • Wavelength accuracy as high as ± 0.0001 nm
  • Automatic calibration with built-in wavelength standard
  • Fastest sustained measurement rate of 1 kHz 
  • Operation available from 375 nm to 2.5 μm 
  • Pre-aligned fiber-optic input
  • Built-in PID controller for precise laser stabilization
  • Straightforward operation with PC using USB or Ethernet
  • Automatic data reporting using custom or LabVIEW programming eliminates the need for dedicated PC


  • Fiber-Optic Couplers
  • Convenient options for launching free-space laser beam into optical fiber.

  • Fiber-Optic Switch
  • Connect up to eight lasers to the model 871.