Non-polarising Plate Beamsplitters
The natural tendency of optical surfaces to reflect s– and p- polarisations with different efficiencies can be a serious problem when working with lasers as the state of polarisation can change as it passes through the optical system.
These non-polarising plate beamsplitters eliminate the problem due to a special coating, which provides 50:50 transmission/reflection for all polarisations. Such coatings only work for one wavelength and angle of incidence, normally 45°.
Nearly all laser wavelengths can be accommodated. The difference between s– and p– polarisation will be within 5% for low power lasers and within 10% for high power lasers.
Here are some typical wavelengths offered:
248, 266, 355, 442, 488, 527, 532, 633, 670, 680, 694, 780, 830, 905, 980, 1047, 1053, 1064, 1310, 1319, 1540, 1550 nm.
Usual diameters are 25.4 and 50.8 mm but other sizes can be supplied on request.