HighFinesse Wavelength Meter

Accurate, Sensitive and Compact, with a Large Spectral Range for High-Speed Measurements of Pulsed and Continuous Lasers

  • Up to 76 kHz measurement speed
  • < 200 kHz resolution
  • 2 MHz absolute accuracy
  • Instruments available for 192 - 11,000 nm

The HighFinesse wavelength meters are the unsurpassed high-end instruments for wave-length measurement of pulsed or continuous laser sources. They deliver the superb absolute and relative accuracy required by cutting edge scientific research, as well as industrial and medical applications.

The unmatched precision of the WS8 series with down to an absolute accuracy of 2 MHz and a measurement resolution of 200 kHz and lower is achieved by using non-moving Fizeau interferometers in a unique geometric configuration. All HighFinesse wavelength meters rely on this well proven concept. To allow even higher stability and precision, temperature and pressure effects are compensated. HighFinesse also offers the fastest commercially available wavemeters. Click here for more information. The sensitivity of the wavelength meters reaches down to the magnitude of nJ while many useful options are available such as PID laser control, offering an active feedback loop for control of the laser wavelength.

  • Specification

      Absolute Accuracy [MHz] Measurement Resolution [MHz] Speed [Hz] Wavelength Ranges [nm] Calibration
    WS8-2 2 0.2 500 330-1180 see SLR-series
    WS8-10 10 0.4 500 248-1750 see SLR-series
    WS7-30 30 1 500 248-2250 see SLR-series
    WS7-60 60 2 500 192-2250 built-in
    WS6-200 200 4 500, IR: 1500 192-11000 built-in
    WS6-600 600 20 950, IR: 1500 192-2250 built-in
    WS5 3000 500 950, IR: 1500 192-11000 built-in


  • Options

    External Trigger

    All wavelength meters detect and measure pulsed signals automatically. Additionally, this option allows the user to trigger pulsed measurements externally. The TTL option guarantees synchronization between pulsed excitation and measurement.

    Laser Control

    With the PID option it is possible to stabilize the frequency of a laser connected to the wavelength meter using a software based proportional-integral-derivative controller (PID controller). Unlike analog PID electronics, the PID option provides software based signal processing, allowing the laser to be stabilized to a specific user defined frequency or regulated with an arbitrary pattern.


    In order to measure the frequencies of more than just one laser at a time, an opto-mechanical switch is used. The combination of our high-speed wavelength meters with one of the quickest fiber switches (MEMS) available allows up to eight channels to be measured almost simultaneously.

    Linewidth Estimation

    The linewidth estimation of a singlemode laser source is performed by a special algorithm which eliminates the interferometer’s instrument response function. The algorithm enables the estimation of the linewidth with an accuracy better than the tenth of the instrument FSR.


    The spectrometer option allows the analysis of emission spectra to an accuracy of 6 GHz, for laser sources with broad emission. The software automatically searches the spectral section where the laser emission line is located and displays it on the screen. In combination with the additional Fizeau interferometer array this allows wide range applications with a single instrument.

    External Calibration

    Standard HighFinesse wavelength meters up to an absolute accuracy of 60 MHz feature autocalibration via an integrated calibration source. This guarantees the accuracy and stability of measurements with our wavelength meters. For the higher accuracies we offer a variety of frequency stabilized, narrow linewidth, laser sources with up to ± 10 kHz frequency stability for different applications.


  • Downloads

    For further technical information, datasheets and product brochures, please click here

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