High damage threshold beamsplitters.

The beamsplitter plate is a thin optical glass plate. The first face is coated with an all-dielectric thin film having partial reflection properties. The second surface is multilayer AR coated for 45° or some other specified incident angle. This beamsplitter has low absorption and high damage threshold, suitable for high energy laser applications where cemented cubes may fail. We provide three kinds of plates, all with strictly guaranteed splitting ratio but are distinguished by the polarization of the incoming and outgoing beams. For BS plates, we obtain partially polarized outgoing beams for randomly polarized incoming light. For PBS plates, we obtain both s-polarized and p-polarized beams from randomly polarized incoming light. For NPBS plates, the polarization of the outgoing beams remains the same when the incoming beam is 45° linearly polarized or circularly polarized.

Unpolarized Beamsplitter Plates

Laser Line Unpolarized Beamsplitter Plates

• Custom R/T and incident angle are available
• Low absorption and high damage threshold

Specifications:
Material	BK7 grade A, fine annealed optical glass
Dimension Tolerance	+ 0.0 / -0.15
Thickness	3 ± 0.15
Parallelism	≤ 1´
Flatness	λ/8 at 632.8 nm
Surface Quality	40 - 20 scratch-dig
Clear Aperture	>90% diameter
R/T	50/50 ± 5% for specified wavelength  R=(Rs+Rp)/2, T=(Ts+Tp)/2
Incident angle	45°
Coatings	S1: Single wavelength beamsplitter coatings S2: AR V-Coatings, R<0.15%

Broadband Unpolarized Beamsplitter Plates

This is a conventional beamsplitter independent of polarization.

Incoming Beam  Outgoing Beams  45° Linearly polarized  Partially polarized Circularly polarized  Natural light

Laser Line Non-polarizing Beamsplitter Plates

These beamsplitters are manufactured using high-precision BK7 or UV-fused silica substrates. A slight wedge in the substrate helps to eliminate back reflections. They are fully dielectric coated, providing a true 50/50 split of energy regardless of the incoming polarization. 

Specifications:
Material	BK7 grade A, precision annealed optical glass
Dimension Tolerance	+ 0.0 / -0.15 mm
Thickness	3 ± 0.15 mm
Parallelism	30´ ± 15´
Flatness	λ/8 at 632.8 nm
Surface Quality	20 - 10 scratch-dig
Clear Aperture	85% diameter
R/T	50/50 ± 5% independent of polarization |Ts-Tp|≤5%, |Rs-Rp|≤5%
Incident angle	45° ± 3°
Absorption	<0.5%
Coatings	S1 is BS coated S2 is MgF2 AR coated, R<0.5%

Laser Line Polarizing Beamsplitter Plates

• High damage threshold
• Low wavefront distortion

Superior high energy polarizer performance is achieved through advanced coating design and meticulous production procedures. These optics have been developed for use in some of the most powerful energy laser systems. The polarizing coatings have been optimized for use with Nd:YAG lasers. When the laser light is incident at Brewster´s angle, Tp>95%, Ts<0.5% and the extinction ratio is greater than 100:1