Laser Thin Film Polarisers

Knight Optical’s Laser Optics range include Thin Film Polarisers which separate the s- and p-polarised light with negligible absorbance within the coating for low loss performance. The laser thin film polarisers are optimised for 515nm and 1030nm design wavelengths, ideal for Ytterbium (Yb) doped lasers including diode-pumped solid-state lasers (DPSSL) and fiber lasers, as well as Nd:YAG lasers emitting at 1064nm. Currently, we stock thin film polarisers which work at either 45° or at Brewster angle (55.4°), both of which have been coated using ion beam sputtered (IBS) technology, creating a compact and durable coating, with a LIDT suited for ultrafast laser applications. Often used within a laser resonator to separate the different polarisation states and can be used as an alternative to polarising beamsplitter cubes or Glan-type polarising prisms. The following are the tolerances for the laser polarisers: Material::UV Fused Silica Diameter::+0/-0.1mm Thickness::+/-0.1mm Surface Quality: :< 20/10 Parallelism::< 3 arc mins Chamfer::0.2-0.4mm x 45 deg Coating S1::Rs > 99.9% & Tp > 98% @ Design W/L (515nm, 1030nm, 1064nm) Coating S2:::ARp < 0.1% @ Design W/L