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Photothermal instruments
Low absorption tests in solids, liguids, gases
- space and time-resolved
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Photothermal systems

Based on Photothermal Common-Path Interferometer (PCI) concept

The instrument
  • Detects the thermal effect of absorption.
  • Insensitive to scattering.
  • Has moderate 3D resolution:
    • test substrate behind the coating, interface between bonded parts
    • make 2D or 3D maps of absorption patterns
  • Can be used to monitor induced, time-dependent absorption:
    • gray tracks,
    • laser-induced transparency (bleaching),
    • initial stages of optical damage, etc.
R&D Quad systems
  • Based on spaceous Quad enclosure design
  • Basic LabView data acquisition
  • Easy change of system configuration
  • Manuals with examples of tests
  • Standard set of sample holders
R&D Quad application
SPTS recommends Quad systems for up to 2" optics testing (crystals, coatings, etc.)
R&D Quad systems can be easily re-configured on-site according to researcher's changing needs
Sensitivity 10-7 allows to observe weak absorption
Optical inhomogenities, optical damage, induced absorption, photorefraction, grey tracks in KTP, and many more
Separates absorption in coating from the bulk for coated substrates
Manual or motorized scanning unit choice gives price flexibility
Common applications
Initial stages of optical damage to glasses and crystals
- blanks
- OH groups
- Surface defects and surface contamination of substrates: fused silica, sapphire, LiNbO3, KTP and TeO2
3D map of bulk absorption (glasses and crystals)
- Longitudinal front-back surface scans
- Absorption in interfaces
- Absorption losses in multi-layered HR dielectric mirrors and AR coatings deposited onto fused silica, BK7, sapphire and other substrates
- Spatial transverse resolution
60-80 �m
- Spatial longitudinal resolution
0.6 mm*
- 2D map of surface absorption
Induced absorption effects
- Green light-induced IR absorption in lithium niobate/tantalate family of crystals including periodically-poled crystals
- Optical bleaching in organic dyes
- Gray track kinetics and gray track shape in KTP family of crystalss
* approximate number (depends on the type of tested optical material)
Stanford Photo-Thermal Solutions

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