Isosceles Dispersive Prisms

Materials: UV grade fused silica (UVFS), CaF2 crystal,
N-SF10, N-SF11, N-SF57, N-SF66, N-BK7, N-LAK21 or N-LAF35 glass.
Become a Brewster prism at the proper apex angle with an extremely
small loss for p-polarized beam.
Widely used for precise GVD compensation in femtosecond lasers.

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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 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

Basic Properties of SF11 and N-SF11 Glass:

	SF11	N-SF11 (RoHS)
Transparency Range	410 - 2000 nm	410 - 2000 nm
Density	4.8 g/cm³	3.2 g/cm³
Thermo-Optic Coefficients (dn/dT)	6.6 x 10^-6 /^oC	-2.1 x 10^-6 /^oC
Optical Homogeneity	Δn < 10^-4/cm	Δn < 10^-4 /cm
Knoop Hardness	450	615
Abrasion Aa	N/A	187
Thermal Expansion Coefficient	8.2 x 10^-6 /K	9.4 x 10^-6/K
Thermal Conductivity	0.74 W/m/K	0.95 W/m/K
Sellmeier Equations (λ in μm):	n²=1+1.73848λ²/( λ² - 0.013607 ) + 0.31117λ²/(λ²-0.061596)+1.17491 λ²/(λ²-121.92271)	n²=1+1.73760λ²/( λ² - 0.013189) + 0.31375λ²/(λ²-0.062307)+ 1.89878 λ²/(λ²-155.23629)
Wavelength (nm)	Refractive Index
1550	1.7447	1.7434
1320	1.7486	1.7478
1064	1.7543	1.7539
800	1.7648	1.7646
632.8	1.7786	1.7786
532	1.7948	1.7948

Transmission curve of SF11:

Isosceles Prism Specifications:

Dimension Tolerance: +0.0, - 0.2 mm
Flatness: λ/6 at 632.8 nm
Surface Quality: 40-20 scratch and dig
Clear Aperture: > 80%
Bevel: 0.2 mm to 0.5 mm x 45^o
Apex Angle Tolerance: < 5'

Apex angle vs. Brewster Wavelength:

Note: The surface loss of p-polarized light incident at ~ Brewster angle is not sensitive to the Apex angle.

Material	Apex Angle Φ (deg)
Fused silica	69.1 (Brewster @ 800 nm)




	68.9 (Brewster @ 600 nm)


N-SF11	59.0 (Brewster @ 800 nm)

N-SF10	60.6 (Brewster @ 800 nm)

N-BK7	67.0 (Brewster @ 800 nm)




CaF2	69.9 (Brewster @ 800 nm)
	68.8 (Brewster @ 266 nm)
N-LAK21	63.0 (Brewster @ 400 nm)

N-LAF35	58.9 (Brewster @ 400 nm)

GVD and TOD @ 800nm:

Material	GVD @ 800 nm	TOD @ 800 nm	Apex Angle	Refractive Index @ 800 nm
UVFS	-16.5 fs²/cm	-20 fs³/cm	69.1°	1.453
SF10	-97.5 fs²/cm	-388 fs³/cm	60.6°	1.711
CaF₂	-5 fs²/cm	-12 fs³/cm	69.9°	1.430

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