Laser 2000

871 Series Pulsed & CW Laser Wavelength Meter

871 Series

Bristol Instruments

871 Series Pulsed & CW Laser Wavelength Meter

  • Wavelength accuracy as high as ± 0.0001 nm
  • Automatic calibration with built-in wavelength standard
  • Operation available from 375 nm to 2.5 μm
  • Sustained measurement rate of 1 kHz
  • Convenient pre-aligned fibre optic input
  • Straightforward operation with PC using
  • USB or Ethernet
  • Display software provided to control measurement parameters and report wavelength data
  • Built-in PID controller for precise laser stabilisation
  • Automatic data reporting using custom or LabVIEW programming eliminates the need for a dedicated PC
  • Convenient tablet/smartphone application reports measurement data anywhere in the laboratory
  • Includes 5 year warranty


High wavelength accuracy
The 871 Laser Wavelength Meter uses a proven Fizeau etalon design to measure the wavelength of pulsed and CW lasers to an accuracy as high as ± 0.2 parts per million (± 0.0002 nm at 1000 nm). Automatic calibration with a built-in wavelength standard guarantees this performance to ensure the most meaningful experimental results.

Fastest sustained measurement rate
The 871 Laser Wavelength Meter 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.

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.

Convenient laser input and straightforward operation
A laser under test enters the 871 Laser Wavelength Meter through a pre-aligned fibre optic input connector. This ensures optimum alignment of the laser beam to the system’s Fizeau etalons resulting in uncompromised accuracy.

The 871 Laser Wavelength Meter operates with a PC connected directly by USB or though a local area network via Ethernet. Software is provided to control measurement parameters and to report wavelength data, or the system can be integrated directly into 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 smartphone to display laser wavelength information anywhere in the laboratory.

Model 871A 871B
Laser Type Pulsed and CW
Range VIS: 375 – 1100 nm
NIR: 630 – 1700 nm
VIS: 375 – 1100 nm
NIR: 630 – 1700 nm
NIR2: 1000 – 2500 nm
Accuracy [1], [2], [3] ± 0.2 ppm (single-mode fibre)
± 0.0002 nm @ 1000 nm
± 60 MHz @ 300,000 GHz
± 0.75 ppm (single-mode fibre)
± 0.0008 nm @ 1000 nm
± 225 MHz @ 300,000 GHz± 1 ppm (multi-mode graded-index fibre ≤ 62.5 μm diameter)
± 0.001 nm @ 1000 nm
± 300 MHz @ 300,000 GHz
Repeatability [4], [5] ± 0.0075 ppm
± 0.0075 pm @ 1000 nm
± 2.25 MHz @ 300,000 GHz
± 0.0125 ppm
± 0.0125 pm @ 1000 nm
± 3.75 MHz @ 300,000 GHz
Calibration [6] Automatic with built-in wavelength standard
Display Resolution 9 digits 8 digits
Units [7] nm, μm, cm-1, GHz, THz
Optical Input Signal
Maximum Bandwidth (FWHM) 1 GHz 10 GHz
Minimum Input [8], [9], [10], [11] VIS: 3 – 300 nJ
NIR: 50 – 600 nJ
VIS: 3 – 300 nJ
NIR: 30 – 600 nJ
NIR2: 50 – 600 nJ
Measurement Rate 1 kHz
Optical Input [12], [13] Pre-aligned FC/PC fibre connector (optional free beam-to-fibre coupler)
Instrument Interface USB and Ethernet interface with Windows-based display program, and browser-based display application
Streaming via RS-422 (internal or external TTL trigger)
Internal data storage for up to 1 million measurements
Library of commands (SCPI) for custom and LabVIEW programming using any PC operating system
PID controller (± 5 V output)
Computer Requirements [14] PC running Windows 10, 1 GB available RAM, USB 2.0 (or later) port, monitor, pointing device
Environmental [8]
Warm-Up Time < 15 minutes
Temperature +15°C to +30°C (-10°C to +70°C storage)
Pressure 500 – 900 mm Hg
Humidity ≤ 90% R.H. at + 40°C (no condensation)
Dimensions and Weight
Dimensions (H x W x D) 89 mm x 432 mm x 381 mm
Weight 7.65 kg
Power Requirements 90 – 264 VAC, 47 – 63 Hz, 50 VA max
Warranty 5 Years (parts and labour)
[1] Defined as measurement uncertainty, or maximum wavelength error, with a confidence level of ≥ 99.7%.
[2] Traceable to accepted physical standards.
[3] Single-mode input fibre must have single-mode performance at the wavelength of the laser under test.
[4] Standard deviation for a 1 minute measurement period after the instrument has reached thermal equilibrium. Standard deviation for a 10 minute period is about
twice the 1 minute specification.
[5] Wavelength resolution is approximately two times repeatability.
[6] For VIS version, stabilised single-frequency HeNe laser. For NIR and NIR2 versions, laser diode locked to acetylene absorption (NIST Special Publication 260-133).
[7] Data in units of nm, μm, and cm-1 are given as vacuum values.
[8] Characteristic performance, but non-warranted.
[9] Required minimum energy from a single laser pulse. Greater sensitivity is achieved by increasing the length of the measurement window to allow for
the integration of a greater number of laser pulses.
[10] Required minimum power is approximated by multiplying the required minimum energy by the selected measurement rate.
[11] Sensitivity at specific wavelengths can be determined from graphs that are provided in the 871 Series Product Details brochure.
[12] Visual inspection and optimisation of the interference fringe pattern is not required.
[13] An FC/PC terminated input fibre is required. System will not operate with FC/APC terminated fibre.
[14] For use with Windows-based display program. Interfacing via SCPI can be done using any PC operating system.
871 Series Pulsed & CW Laser Wavelength Meter Datasheet
871 Series Pulsed & CW Laser Wavelength Meter Brochure

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871 Series

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