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872 Series Laser Wavelength Meter

Highest resolution wavelength measurement

Precisely stabilize your laser’s wavelength

The 872 Series Laser Wavelength Meter builds upon our unique Fizeau etalon technology to provide a frequency resolution as high as 200 kHz. Therefore, the model 872 can detect very small wavelength deviations making it ideal for experiments where a laser’s frequency must be actively regulated.


Fast, accurate, and reliable wavelength measurement

The 872 Laser Wavelength Meter measures the wavelength of both CW and pulsed lasers that operate from 375 to 1700 nm. The 872 system’s accuracy is ± 0.2 parts per million (± 60 MHz at 1000 nm) and its frequency resolution is better than 1 part per billion (300 kHz at 1000 nm). Automatic calibration with a built-in wavelength standard guarantees this performance to ensure the most meaningful experimental results.

The Fizeau etalons of the 872 Laser Wavelength Meter generate a spatial interferogram that is detected by a fast photodetector array. An on-board digital signal processor quickly converts the interferometric data to wavelength. Because this calculation is done within the instrument, a sustained measurement rate as high as 1 kHz is achieved.

Straightforward operation

The 871 Laser Wavelength Meter operates with a PC connected directly by USB or through a local area network via Ethernet. Software is provided to control measurement parameters and to report wavelength data.

The software also includes a proportional-integral-derivative (PID) controller. This feature compares the current wavelength measurement to a user defined set point to generate a corrective analog output voltage that can be used to stabilize a laser’s wavelength. This voltage is delivered through a BNC connector on the back panel of the 872 system.

  • Measurement resolution up to 200 kHz
  • Wavelength accuracy as high as ± 0.0001 nm
  • Automatic calibration with a built-in wavelength standard
  • Built-in PID controller for precise laser stabilization
  • Operation available from 375 to 1700 nm
  • Sustained measurement rate of 1 kHz
  • Convenient pre-aligned fiber-optic input
  • Straightforward operation via PC using USB or Ethernet
  • Automatic data reporting using custom or LabVIEW programming eliminates the need for a dedicated PC
  • Optional Fiber-Optic Switch accessory enables the characterization of up to 8 lasers with a single instrument
  • 5-year warranty covers all parts and labor

Stabilize the frequency of up to 8 lasers connected to the model 872.

Connect up to eight lasers to the model 872 with our fiber-optic switches.

Choose from a selection of convenient accessories for operation with optical fiber.