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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
Quad industrial systems features
Motorized XYZ scanning unit 1"x1"x1" or 2"x2"x2" (replaces manual version)
Programmatic control of the scanning unit. Automatic 1D/2D/3D sample scanning
Quick-change sample holders for screening tests
2 types of the Quad enclosure: with 1 port for pump lasers or with 2 ports
Choose required photothermal system configuration using System builder tab
Common Quad specifications
Probe laser
Low noise class IIIa He-Ne
Probe wavelength
633 nm
Pump/probe crossing angle
0.1 rad
Pump chopping frequency range
200-800 Hz
Sensitivity to bulk absorption
(minimum absorbed pump power per 1cm length)
1 W*, CW or average
Sensitivity to surface absorption
(minimum absorbed pump power)
0.1 W*, CW or average
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
Lock-in amplifier type
Nnumber of photodetectors
* approximate number (depends on the type of tested optical material)
Other features
Sensitivity of absorption measurements
- 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
Tel.: +1 408 898-0446

E-mail: info@stan-pts.com
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