Beamsplitter, Non-Polarizing, 25.4 mm Diameter, 1550 nm Laser Line

Laser Line Non-Polarizing Plate Beamsplitters

The 10B20NP.31 Laser Line Non-Polarizing Beamsplitter is insensitive to the polarization of an incoming beam. Unlike broadband dielectric beamsplitters, which are extremely polarization sensitive, this beamsplitter provides a true 50/50 split regardless of the incoming polarization. The polarization components are matched to within 5%. Near zero absorption in these dielectric beamsplitters results in true 50/50 split of the beam and high damage threshold. They are especially useful for higher power applications where cemented cube beamsplitters may fail. This 25.4 mm diameter beamsplitter is manufactured using a high-precision BK 7 substrate to minimize wavefront distortion. A slight wedge in the substrate helps eliminate back reflections to the laser. The front surface is coated with a multilayer all-dielectric non-polarizing beamsplitter coating optimized for 1550 nm. The back surface is coated with a multilayer dielectric antireflection coating to minimize surface reflection losses and eliminate ghost images.

Specifications

Technical Specs

Wavelength Range
1550 nm
Diameter
25.4 mm
Material
Grade A N-BK7
Coating Code
NP.31
Antireflection Coating
R <0.5%
Angle of Incidence
45°±3°
Orientation
Beam should enter surface marked with an arrow
Reflection
50 ±5%, independent of polarization
Transmission
50 ±5%, independent of polarization
Polarization
S- and P-polarization components matched to within 5%
Wavefront Distortion
≤λ/10 at 632.8 nm over the clear aperture
Damage Threshold
500 W/cm² CW, 0.5 J/cm² for 10 ns 1064 nm pulses, typical
Surface Flatness
≤λ/10 at 632.8 nm over the clear aperture

Surface Quality
15-5 scratch-dig
Diameter Tolerance
+0/-0.13 mm
Thickness
6.1 mm
Thickness Tolerance
±0.38 mm
Wedge
30 ±15 arc min
Clear Aperture
> central 80% of diameter
Chamfers
0.5 mm face width
Chamfers Angle Tolerance
45° ±15°
Durability
MIL-C-675C, moderate abrasion million cycles
Cleaning
See How to Clean Optics

Wavelength Range
1550 nm
Diameter
25.4 mm
Material
Grade A N-BK7
Coating Code
NP.31
Antireflection Coating
R <0.5%
Angle of Incidence
45°±3°
Orientation
Beam should enter surface marked with an arrow
Reflection
50 ±5%, independent of polarization
Transmission
50 ±5%, independent of polarization
Polarization
S- and P-polarization components matched to within 5%
Wavefront Distortion
≤λ/10 at 632.8 nm over the clear aperture
Damage Threshold
500 W/cm² CW, 0.5 J/cm² for 10 ns 1064 nm pulses, typical
Surface Flatness
≤λ/10 at 632.8 nm over the clear aperture

Surface Quality
15-5 scratch-dig
Diameter Tolerance
+0/-0.13 mm
Thickness
6.1 mm
Thickness Tolerance
±0.38 mm
Wedge
30 ±15 arc min
Clear Aperture
> central 80% of diameter
Chamfers
0.5 mm face width
Chamfers Angle Tolerance
45° ±15°
Durability
MIL-C-675C, moderate abrasion million cycles
Cleaning
See How to Clean Optics

Resources & Downloads

3D Product Models

Download CAD Files

2D Product Drawings

Non-pol BS-S(104.2 kB, PDF)

Other

10B20NP.31 RoHS Certificate(703.2 kB, PDF)
NP.31 Raw Data.xlsx(52.4 kB, XLSX)

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