Broadband Dielectric Beamsplitter, 50.8 mm, N-BK7,1290-1580 nm

The 20B20BS.3 Broadband Dielectric Beamsplitter is made of N-BK7 glass, 50.8 mm in diameter, 9.4 mm thick, with a surface flatness of λ/10, and coated for 1290-1580 nm. Our broadband dielectric beamsplitters are designed to provide general purpose laser beam splitting and combining for visible through near infrared applications. Each coating is essentially achromatic across a wide spectral band so that a single optic will work for the entire range of a particular tunable laser, for several laser diode wavelengths, or for most visible laser wavelengths.

Specifications

Technical Specs

Wavelength Range
1290-1580 nm
Diameter
50.8 mm
Material
Grade A N-BK7
Coating Code
BS.3
Antireflection Coating
NC.3
Angle of Incidence
45°
Reflection
R_s = 50 ±5%, R_p ≤R_s
Damage Threshold
500 W/cm² CW, 10 J/cm² for 10 nsec pulses, typical @ 1570 nm
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
9.4 mm
Thickness Tolerance
±0.38 mm
Wedge
30 ±15 arc min
Clear Aperture
> central 80% of diameter
Chamfers
0.38-1.14 mm face width
Chamfers Angle Tolerance
45° ±15°
Durability
MIL-C-675C, moderate abrasion million cycles
Cleaning
See How to Clean Optics

Wavelength Range
1290-1580 nm
Diameter
50.8 mm
Material
Grade A N-BK7
Coating Code
BS.3
Antireflection Coating
NC.3
Angle of Incidence
45°
Reflection
R_s = 50 ±5%, R_p ≤R_s
Damage Threshold
500 W/cm² CW, 10 J/cm² for 10 nsec pulses, typical @ 1570 nm
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
9.4 mm
Thickness Tolerance
±0.38 mm
Wedge
30 ±15 arc min
Clear Aperture
> central 80% of diameter
Chamfers
0.38-1.14 mm face width
Chamfers Angle Tolerance
45° ±15°
Durability
MIL-C-675C, moderate abrasion million cycles
Cleaning
See How to Clean Optics

Resources & Downloads

Drawings And Cad

BS-1-DWG-S(72.2 kB, PDF)

Other

20B20BS.3 RoHS Certificate(264.6 kB, PDF)
20B20BS.3_ROHS2-2021.pdf(0, PDF)
BS.3 Raw Data.xlsx(181.4 kB, XLSX)

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