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Photothermal instruments
Low absorption tests in solids, liguids, gases
- space and time-resolved
- insensitive to scattering and non-thermal absorption losses
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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.
Quad
Solano
R&D Solano systems (Solano housing temporarily unavailable, completely replaceable with the Quad design)
  • Based on Solano enclosure design
  • Basic LabView data acquisition
  • Designed for testing coated substrates
  • Manuals with examples of tests
  • Standard set of sample holders
R&D Solano systems application
SPTS recommends Solano systems for up to 2" optics testing (crystals, coatings, etc.)
Solano systems are designed to effectively test all types of optical coatings including multi-layered
Sensitivity 10-7 allows to observe weak absorption
Optical inhomogenities, absorption anomalies, lack of thermal annealing, etc.
Separates absorption in coating from the bulk for coated substrates
Extra photodetectors can be used to test coatings at their design angle of incidence
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 µm
- 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
Photorefraction
* approximate number (depends on the type of tested optical material)
Stanford Photo-Thermal Solutions
Tel.: +1 408 898-0446

E-mail: info@stan-pts.com
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