Beamsplitter Cube, Non-Polarizing, 50.8 mm, 700-1100 nm Broadband

Broadband Non-Polarizing Cube Beamsplitters

The 20BC17MB.2 Broadband Non-polarizing Hybrid Cube Beamsplitter has moderate absorption but minimal polarization sensitivity. The broad spectral flatness of this beamsplitter makes it ideal for use with multiple lasers or tunable lasers. Incoming beams are both transmitted and reflected 45%, with the s and p-polarized components matched to within 10% of each other. Hybrid beamsplitters are less sensitive to changes in angle of incidence, resulting in an optic that is chromatically neutral for both convergent and divergent beams.

The four faces are antireflection coated with a broadband multilayer dielectric coating to minimize surface reflection losses over the 700-1100 nm wavelength range, providing R<0.5% per surface. Due to the metallic nature of the hybrid coating, these beamsplitters are not intended for use with higher power lasers.

Broadband Metal-dielectric Hybrid Coatings

Three metal-dielectric hybrid broadband coatings are offered covering the 400-700 nm, 700-1100 nm, and 1100-1600 nm wavelength ranges. Incoming beams are both transmitted and reflected 45%, with the s and p-polarized components matched to within 10% of each other. Hybrid beamsplitters are less sensitive to changes in angle of incidence, resulting in an optic that is chromatically neutral for both convergent and divergent beams.

Works Great With Tunable lasers

Broadband non-polarizing hybrid cube beamsplitters have moderate absorption but minimal polarization sensitivity. The broad spectral flatness of these beamsplitters makes them ideal for use with multiple sources or tunable lasers.

Constructed With Pair of Right-Angle Prisms

These beamsplitters consist of a pair of precision right-angle prisms carefully cemented together to minimize wavefront distortion. The hypotenuse of one of the prisms is coated with a metal-dielectric hybrid beamsplitter coating optimized over a broad wavelength range. The four faces are antireflection coated with a broadband multilayer dielectric coating to minimize surface reflection losses over the wavelength range. Due to the metallic nature of the hybrid coating, these beamsplitters are not intended for use with higher power lasers.

Proper Orientation

Cube beamsplitters are formed by cementing two right angle prisms together. One of the two prisms has the partially reflective metal-dielectric coating applied to its hypotenuse. In Newport's cube beamsplitters the coated prism is marked with a visible dot. Incident light should enter the prism with the coated hypotenuse in order to minimize power passing through the optical cement. Alternatively, a beam entering via the uncoated prism results in more than triple the fluence in the cement (the transmitted component, plus a double pass by the reflected component). With higher power beams this can result in degradation of the cement.

Specifications

Technical Specs

Wavelength Range
700-1100 nm
Size
50.8 x 50.8 x 50.8 mm
Shape
Cube
Material
Grade A N-BK7
Coating Type
Broadband metal-dielectric non-polarizing
Coating Code
MB.2
Antireflection Coating
Multilayer broadband dielectric
Angle of Incidence
0°±5°
Orientation
To avoid damage, beam should enter prism marked with a dot
Reflection
R_{s, p} = 45 ±5% average, 35%≤ R_{s, p} ≤55%
Reflected Beam Deviation
90° ±5 arc min
Transmission
T_{s, p} = 45 ±5% average, 35%≤ T_{s, p} ≤55%
Transmitted Beam Deviation
≤5 arc min

Polarization
S- and P-polarization components matched to within 10%,|T_s - T_p| ≤10%, |R_s - R_p| ≤10%
Wavefront Distortion
≤λ/4 at 632.8 nm over the clear aperture
Surface Quality
40-20 scratch-dig
Surface Flatness
≤λ/4 at 632.8 nm
Damage Threshold
100 W/cm² CW, 0.1 J/cm² with 10 nsec pulses, typical
Clear Aperture
>80% of central dimension
Size Tolerance
±0.254 mm
Operating Temperature Range
-50 to 90°C
Durability
MIL-C-675C
Cleaning
See How to Clean Optics

Wavelength Range
700-1100 nm
Size
50.8 x 50.8 x 50.8 mm
Shape
Cube
Material
Grade A N-BK7
Coating Type
Broadband metal-dielectric non-polarizing
Coating Code
MB.2
Antireflection Coating
Multilayer broadband dielectric
Angle of Incidence
0°±5°
Orientation
To avoid damage, beam should enter prism marked with a dot
Reflection
R_{s, p} = 45 ±5% average, 35%≤ R_{s, p} ≤55%
Reflected Beam Deviation
90° ±5 arc min
Transmission
T_{s, p} = 45 ±5% average, 35%≤ T_{s, p} ≤55%
Transmitted Beam Deviation
≤5 arc min

Polarization
S- and P-polarization components matched to within 10%,|T_s - T_p| ≤10%, |R_s - R_p| ≤10%
Wavefront Distortion
≤λ/4 at 632.8 nm over the clear aperture
Surface Quality
40-20 scratch-dig
Surface Flatness
≤λ/4 at 632.8 nm
Damage Threshold
100 W/cm² CW, 0.1 J/cm² with 10 nsec pulses, typical
Clear Aperture
>80% of central dimension
Size Tolerance
±0.254 mm
Operating Temperature Range
-50 to 90°C
Durability
MIL-C-675C
Cleaning
See How to Clean Optics

Resources & Downloads

3D Product Models

Download CAD Files

Other

20BC17MB.2 RoHS Certificate(264.3 kB, PDF)
20BC17MB.2_ROHS2-2021.pdf(279.3 kB, PDF)

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