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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
Custom made systems
If you have any special requirements for materials characterization or you'd like to integrate PCI in your quality control system or you are just looking for a bit different resolution, spectral range, scanning speed or any other parameter which our standard Solano and Quad instruments do not meet we'll be glad to consider your inquiry!
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 µW*, CW or average
Sensitivity to surface absorption
(minimum absorbed pump power)
0.1 µW*, CW or average
Transverse resolution in space
60 µm
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
Tel.: +1 408 353-3943

E-mail: alex.shevchuk@stan-pts.com
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