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 Vd, 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 |
| Material |
Minimum Angle
of Deviation |
Vdb
|
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 |
2c
|
Click |
