Non-polarising Cube Beamsplitters
When
using lasers it is often important to preserve the polarisation state of light
passing through an optical system. These
non-polarising cube beamsplitters are coated so that the s- and p- states of
polarisation are equally transmitted and reflected at the wavelength of
interest. Such coatings only
work for one wavelength. Nearly all
visible and near infra-red laser wavelengths can be accommodated. Due to the cement layer, power levels are restricted to low
power applications. The difference
between s– and p– polarisation will be within 5%.
As well as 50:50 split these cubes can be supplied for other split ratios
such as 33:67.
External
cube faces are anti-reflection coated for the laser wavelength. Cubes are often easier to use than plate reflectors and they
provide protection for the coating, which is internal to the cube.
Here
are some typical wavelengths offered:
413,
442, 488, 515, 527, 532, 633, 670, 680, 694, 780, 830, 905, 1047, 1053, 1064,
1310, 1319, 1540, 1550 nm.
Standard
cube sizes are 3, 5, 6.35, 10, 12.7, 20, 25.4, 38.1 and 50.8 mm but other sizes
can be supplied on request.