Chromatis™ is a production-grade test instrument designed specifically to measure group delay dispersion in optical components for femtosecond applications.  It is a broadband optical test instrument that quickly and accurately characterizes the full dispersive properties of optical components and coatings.  Carefully managing optical dispersion is critical for optimal performance of ultrafast laser systems, multi-layer mirrors, and multiple quantum well structures.  Chromatis™ is user friendly, self-calibrating, and highly accurate.

Read the Photonics Spectra article on Chromatis™:

KMLabs’ Chromatis™ instrument was used for judging the SPIE Damage Symposium Thin Film Coating Competition in 2015 and 2016.  Results for 2015 and 2016 are available through SPIE.

Key performance parameters of the Chromatis™ instrument include:

  • Group Delay Dispersion (GDD) accuracy:  ± 5 fs²
  • Measurement of both polarizations simultaneously
  • Rapid measurements – typically a few seconds per optic
  • He-Ne reference laser for automated, built-in self-calibration of every measurement.  Chromatis™ does not use a spectrometer, and no spectrometer calibration is necessary
  • Standard designs for 1” and 2″ diameter optics, highly repeatable fixtures and opto-mechanical referencing
  • Precision fixtures available for:
    1. 0° Angle of Incidence (AOI) in Reflection
    2. 5° – 70° AOI in Reflection
    3. 0° -70° AOI in Transmission
    4. Mirror pair measurement with variable AOI  (6° -54°) (available as upgrade option)
  • Reference optics for reflection and transmission modes of operation
  • Three user-replaceable detector modules (Silicon module included with standard system):
    1. Silicon:  500nm – 1100nm
    2. InGaAs:  1000nm – 1650nm (available as upgrade option)
    3. NEW in 2017: PbS: 1400nm – 2200 nm (available as an upgrade option)
  • Simple, intuitive graphical user interface for technicians or power users.  Generate and customize your measurement reports.
  • Laptop computer included, with pre-installed measurement and control software
  • On-site installation and training visit available as upgrade option.
  • Customized measurement configurations available

The example below shows where a coating company wanted to make a coating with a fixed amount of GDD over a wavelength range around 1030nm.  The KMLabs Chromatis™ was invaluable in the optimization of GDD for this coating design.


Optimizing dispersion curve of mirrors for use in a high-power OPO