Introduction of TFP Polarizer

Thin-film polarizers (TFPs) can split a laser beam into two parts with orthogonal polarizations. Conversely, TFPs can be used to combine two beams with orthogonal polarizations. TFPs consist of a coated plate that is oriented at Brewster’s angle with respect to the incoming beam. The thin-film coating serves to enhance the beam’s s-polarized reflectivity while maintaining the p-polarized component’s high transmission.
Thin film polarizers (TFP) are used to separate the polarization directions of light (s- and p-polarization). If the TFP is installed under the Brewster angle (material-dependent), complete cancellation of the p-polarized component is achieved.
LAYERTEC produces thin film polarizers on flat substrates for wavelengths between 260 nm and 2500 nm. In contrast to polarization beam splitter cubes, they have high laser damage thresholds and are therefore optimally suited for use in high-power lasers.
TFPs are manufactured for angles of incidence > 40°. At the Brewster angle, they have a much wider bandwidth and higher Ts/Tp ratio. Typical polarization ratios are Ts/Tp > 500 for AOI = 45° or 55°. An extended wavelength range with limited polarization ratio can be achieved by choosing incidence angles beyond the Brewster angle.