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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
  • Monitors induced, time-dependent absorption:
    • gray tracks,
    • laser-induced transparency (bleaching),
    • initial stages of optical damage, etc.
Quad
Solano
High-end Quad systems (coming by the end of 2019)
  • Based on spacious Quad enclosure design
  • Motorized attenuators and Imaging Unit for better productivity
  • Advanced software
  • Extended automation of standard tests
  • Individually designed sample holders
Quad high-end systems features
Motorized XYZ scanning unit 2"x2"x2"
Motorized IU, motorized attenuators
Quick-change sample holders for screening tests
Enclosed pump beam path for operator's safety
Common Quad specifications
Probe laser
Low noise class 3R HeNe
Probe wavelength
633 nm
Pump/probe crossing angle
0.12 rad
Pump chopping frequency
380-390 Hz
Sensitivity for bulk absorption, transmission detector,
10 W laser source
1 μW*
Sensitivity to surface absorption
(minimum absorbed pump power detectable)
0.1 �W*, average pump power
Transverse resolution in space
60 �m
Longitudinal resolution in space
0.6 mm*
Resolution in time
from 0.01 sec
Precision for relative measurements of absorption
<5%
Lock-in amplifier type
dual-phase
Nnumber of photodetectors
1
* approximate number (depends on the type of tested optical material)
Other features
Sensitivity of absorption measurements
10-7
- Low absorption in the bulk optical materials for high power applications such as sapphire, YAG, fused silica, LiNbO3, KTP, TeO2, etc.
Insensitive to scattering
- Photothermal systems detect thermal effect of absorption
Stanford Photo-Thermal Solutions


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