Fresnel Biprisms

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.

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Part No.	Description	Application	Material	Wavelength	Bandwidth	Size	Aperture	Thickness	Length	Angle	Doping	Orientation	Displacement	Retardation	Delay	Coating	End cut	Holder	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:

material-bk7.GIF (10870 bytes)

Basic Properties of Fused Silica Glass:

Transparency Range: 185 - 2300 nm	Transmission Curve
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) : n²=1 + 0.69617λ²/(λ² - 0.00468) + 0.40794λ²/(λ² - 0.01351) + 0.89748 λ²/(λ²- 97.93400)
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
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%

test-pdf-file-downloadfolder (35.04KB)

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