The instrument is manufactured based on the photothermal common path interferometer (PCI) technology, which is an improved thermal lens measurement technology. The focused beam of the pump laser produces a local thermal effect, and the optical probe undergoes phase distortion in the heated area. The detector records the wavefront changes caused by the phase distortion. Because the wavefront is very sensitive to phase changes, the cause of the phase change is interference, so this change can be clearly seen near the area where the distortion occurs, so the far-field measurement of the thermal lens is realized in the near field, which greatly reduces the measurement noise and improves the sensitivity of the instrument, and can achieve an ultra-high sensitivity of less than 0.1ppm.
At present, almost all companies in the world that research laser materials have PCI weak absorption testers to control the weak absorption characteristics of materials. The PCI test is already a recognized instrument in the industry.
-
General Properties
- High sensitivity: better than 0.1 ppm
- 3D measurement of sample surface and interior
- Insensitive to surface scattering
- Open instrument design, easy to adjust the optical path and sample
- Mainly used in the fields of absorption characteristics testing of materials and films, precision monitoring of film manufacturing processes, etc., can be used for the following specific applications:
> Optical materials: material body absorption of glass and crystals, material uniformity, laser induced absorption, annealing effect, etc.
> HR, AR films: weak absorption of film layers, surface defects and contamination, etc.
> Nonlinear laser crystals such as KTP, BBO, LBO, CBO, LiNbO3, LiTaO3, etc.: gray trace characterization, induced absorption, etc.
> Glued surfaces: optical glue interface, liquid crystal battery, etc.
> Liquid and gas samples
-
Other Accessories
- Optional measurement methods: transmission, reflection, angle test, etc.
- Optional pump laser wavelengths: 1319nm, 1064nm, 532nm, 355nm
- Optional measurement channels: standard single pump light, optional 2 channels, 3 channels
