Plate Beamsplitter

Beam Sampler

Beam samplers are Fresnel reflections to pick-off 1-10% of the incident beam at 45deg. They are typically used for monitoring applications where the attenuation of the transmitted beam must be kept to a minimum. The backside is wedged to eliminated internal interference fringes and AR coated to remove ghosting.

Beamsplitting Mirror

Like beam sampler, but the first surface is coated so as to get 10% to 90% of the incident beam at 45deg. The T/R ratio of dielectric beamsplitting coating is partially polarization dependent, however the absorption loss to the coating is minimal. Special design can be made for polarization independent beamsplitter.

Plate Beamsplitter Specifications

Material N-BK7 or UV Fused Silica
Dimension Tolerance: +0/-0.13mm
Surface Flatness: λ/10@633nmm
Wedge: 30 +/-10 arc minutes
Surface Quality: 40/20 Scratch-Dig
AR Coating: R < 0.5%
T/R Ratio: 10:90 to 95:5 Unpolarized Light
Clear Aperture: 90% central diameter

Standard wavelength - Narrow Band: 488, 532, 633, 780, 850, 980, 1064, 1310, 1550 nm Broadband: 450-680, 650-850, 900-1200, 1250-1570, 1500-1610 nm

Standard Sizes: 10mm, 12.7mm, 25.4mm

Custom-made beamsplitter plate at different sizes, shapes or material is also available upon request.

Plate Beamsplitter Inquiry Form