T-PS856 - N-F2 Equilateral Dispersive Prism, 15 mm

Part No.: T-PS856

$ 178.00

T-PS856 - N-F2 Equilateral Dispersive Prism, 15 mm

Product Drawing

N-F2 is a RoHS compliant material that has been engineered to have nearly identical optical properties as F2. Like F2, it is a flint glass that offers excellent performance in the visible and NIR spectral range. It offers a high refractive index and low Abbe number, making it excellent for use in an equilateral dispersive prism.

Polarization Effects
For P-polarized light (blue line) incident on a dispersing prism at the angle of least deviation, the graph to the right shows that only a small percentage of the P-polarized light is reflected at the surface. Thus, for this polarization, the transmission through a prism fabricated from N-F2 will be excellent even though there is no AR coating on the surface.

N-SF11, F2, and N-F2
Both N-SF11 and F2 offer excellent performance in the visible range. When compared to each other, F2, which is a flint glass, has superior chemical resistance and better transmission than N-SF11. For instance, at 420 nm the theoretical internal transmittance of a 10 mm thick piece of F2 is 0.995, whereas for the same thickness of N-SF11, the internal transmittance is 0.910. If the glass is increased to a thickness of 25 mm, these internal transmission values decrease to 0.987 and 0.790, respectively. With high indices of refraction and low Abbe Numbers V_d, N-SF11 and F2 provide maximum dispersive power.

N-F2 is a RoHS compliant material that has been engineered to have nearly identical optical properties as F2. At 633 nm, both N-F2 and F2 have an index of refraction of 1.617, and they have nearly identical Abbe numbers of 36.43 and 36.37, respectively.

Material	Wavelength Range	Index of Refraction	Abbe Number
F2	385 nm - 2 µm	1.617 @ 633 nm	36.37
N-F2	420 nm - 2 µm	1.617 @ 633 nm	36.43
N-SF11	420 nm - 2.3 µm	1.779 @ 633 nm	25.76
CaF	180 nm - 8 µm	1.433 @ 633 nm	95.00
ZnSe	600 nm - 16 µm	2.403 @ 10.6 µm	N/A

Item #	A=B=C=H (mm)	Material	Minimum Angle of Deviation	V	Surface Flatness @ 633 nm

T-PS856	15 ± 0.15	N-F2	47.9° @ 633 nm	36.43	λ/10
T-PS858	20 ± 0.15
T-PS854	50 ± 0.15

Material	Minimum Angle of Deviation	V_d^b	Surface Flatness @ 633 nm	Clear Aperture	Surface Quality	Angular Tolerance	Number of Polished Faces	Index of Refraction Plot
N-F2	47.9° @ 633 nm	36.43	λ/10	70%	40-20 Scratch-Dig	±5 arcmin	2^c	Click