Cavity-Ringdown (CRD) Loss Meter and Reflectometer


Our reflectometer GLACIER® uses the extreme sensitivity of cavity ring-down spectroscopy to quantify the losses of advanced optical coatings down to 5 ppm. As a typical application the device can characterize supra-mirrors with up to 99.9995% reflectivity. Conventional absorption and reflection measurements are not sufficiently sensitive to quantify today´s super-reflective mirror coatings and are typically limited to the >1000 ppm range (corresponding to <99.9% reflectivity). Cavity ring-down spectroscopy measures optical losses by the decay of the energy stored inside a cavity.
The technique reaches unrivalled sensitivity because the losses are experienced over and over again after every round trip inside the cavity. Smaller losses lead to longer intra-cavity dwell time thereby automatically increasing the measurement precision. The device features high-speed data acquisition and allows to record measurements within seconds. It is delivered complete with a computer and a user-friendly software interface for acquisition and real-time analysis.

Key Product Features

  • Reflectivity measurements
    • Reflectivities up to 99.9995%
    • Various angles of incidence: 5° - 45° (and 0°)
    • s and p polarization (separately)
  • Antireflective coating characterization: Reflectivity down to 0.0005% (5 ppm)
  • Simple and reproducible alignment: for 0.5", 1" and 2" optics
  • Spring-loaded mirror fixtures for reproducible mounting without strain
  • Computer and user-friendly software interface included
  • High-speed data acquisition and real-time analysis: Complete measurement and analysis within seconds
  • Available wavelengths:
    • 375 - 1550 nm
    • other wavelenghts are available upon request
  • Standard Footprint: 90 x 45 cm2 (standard size)

A family of GLACIERs to choose from. Pick the one that suits your needs best:

Number of wavelengths One Three Three*
Maximum number of wavelengths Three Four Unlimited!
Possible to add more wavelengths at a later point Yes** Yes** Yes
Wavelength range 375 — 1550 nm
(diode laser based)
355, 532 and 1064 nm
4th wavelength:
diode laser based
(375 — 1550 nm)
450 — 2000 nm
(freely selected)
Laser source Diode laser Microchip laser Supercontinuum with monochromator
Footprint 90 x 45 cm2
90 x 55 cm2 for more
than 1 wavelength
90 x 55 cm2 90 x 55 cm2
Reflectivity measurements Reflectivities up to 99.9995%
Antireflective coating characterization Reflectivity down to 0.0005% (5 ppm)
Angle of incidence 5° - 45° and 0°
Polarization s and p (separately)
Optics size 0.5", 1"
(2” and more upon request)
Software Computer and user-friendly software interface included

*Included in the basic version, more can be added.

**Factory upgrade required. For GLACIER, a bigger footprint should be considered in advance (90 x 55 cm2).