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Photothermal instruments
low absorption tests in solids, liguids, gases, thin films
- 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.
Industrial Quad systems
  • Based on spaceous Quad enclosure design
  • Noise/vibration isolation
  • Advanced software
  • Extended automation of standard tests
  • Individually designed sample holders
Industrial Quad model application
SPTS recommends Quad systems for up to 2" optics screening (crystals, coatings, etc.)
Systems based on Quad design possess higher transverse spatial resolution. Small absorption anomalies can be located
Sensitivity 10-7 allows to observe weak absorption
High 3D-resolution allows to observe inhomogeneity, optical damage, induced absorption, bleaching, photorefraction, etc.
Separates absorption in coating from the bulk for coated crystals
Motorized scanning unit along with advanced software allows using industrial systems for massive Quality Control purposes in optical industry
A set of individually designed samples holders makes testing convenient and efficient
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
Tel.: +1 408 898-0446

E-mail: info@stan-pts.com
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