Material: High grade BK7 (N-BK7) or UV grade fused silica (UVFS) glass
Large apex angle close to 180°
Widely used in interferometers, auto/cross-correlators, and GRENOUILLEs.
With a base of 1.0mm for apex angle > 160°.
With/without a base for apex angle =< 160°
Uncoated for standard products. AR coating available upon request.
Application Examples:
Part No. | Material | Size | Angle | Coating | Price | Availability | Add to Cart |
Basic Properties of BK7 and N-BK7 Glass:
BK7 |
N-BK7 (RoHS) | |
Transparency Range | 360 - 2000 nm | 360 - 2500 nm |
Density | 2.51 g/cm3 | 2.51 g/cm3 |
Thermo-Optic Coefficients (dn/dT) |
2.3 x 10-6 /oC | 2.3 x 10-6 /oC |
Optical Homogeneity | Δn < 10-6/cm | Δn < 10-6/cm |
Knoop Hardness | 610 | 610 |
Thermal Conductivity | 1.1 W/m/K | 1.1 W/m/K |
Thermal Expansion Coefficients |
8 x 10-6/K |
7.1 x 10-6/K |
Sellmeier Equations (λ in µm) |
n2=1+1.03961λ2/(λ2- 0.0060007 ) + 0.23179λ2/(λ2-0.020018)+1.01047 λ2/(λ2-103.5600) | n2=1+1.03961λ2/(λ2- 0.0060007 ) + 0.23179λ2/(λ2-0.020018)+1.01047 λ2/(λ2-103.5607) |
Wavelength (nm) | Index of Refraction | |
400 | 1.5308 | 1.5308 |
532 | 1.5194 | 1.5194 |
588 | 1.5167 | 1.5167 |
632.8 | 1.5150 | 1.5150 |
800 | 1.5108 | 1.5108 |
1064 | 1.5066 | 1.5066 |
Transmission curve:
Basic Properties of Fused Silica Glass:
Transparency Range: 185 - 2300 nm |
|
Density: 2.2 g/cm3 | |
Thermo-Optic Coefficients: dn/dT= 1.0 x 10-5 /oC |
|
Optical Homogeneity: Δn < 10-6/cm | |
Mohs Hardness: 7 | |
Thermal Conductivity: 1.4 W/m/K | |
Thermal Expansion Coefficient: | α = 0.54 x 10-6/K |
Sellmeier Equations: (λ in μm) : |
|
Wavelength(nm) | Index of refraction |
1550 | 1.4440 |
1320 | 1.4466 |
1064 | 1.4496 |
800 | 1.4533 |
632.8 | 1.4570 |
532 | 1.4607 |
400 | 1.4701 |
355 | 1.4761 |
266 | 1.4997 |
213 | 1.5352 |
Fresnel Biprism Specifications
Dimension Tolerance:+/- 0.2 mm
Apex Angle Tolerance: < 6'
Protective Bevel: ~ 0.2 mm for biprisms without a base
Flatness: λ/4 at 632.8 nm
Surface Quality: 20-10 scratch and dig
Clear Aperture: > 80%
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