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Often used in monochromators based on Czerny-Turner optical scheme |
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Toroidal mirrors are focusing devices having two different radii
whose axes are oriented perpendicularly. They are utilized in
instances where a beam must be focused and folded. Rather than
using both a spherical mirror and a plane mirror for this purpose,
both functions may be combined in one element. Toroidal mirrors
also correct for the astigmatism that result when a spherical
mirror is used off axis.
Standard Specifications
| Standard | Enhanced |
| Material | Zerodur, Astrositall, FS, ULETM , Si, Cu, Al, Pyrex, BK7 |
| Wavelength range, nm | 9 - 200 |
| Dimensions, mm | up to 500 | up to 1200 |
| Clear Aperture (CA) | <90% | up to 100% |
| Focal length tolerances | ±0.5% | ±0.01% |
| Micro-roughness, nm (RMS) | ~2 | ≤0.4 |
| Slope Error, arcsec (RMS) | 1 - longtitudal, 4 - transverse | 0.3 - longtitudal, 0.8 - transverse |
| Shape accuracy @ 632.8 nm | ≤λ/30 | λ/100 |
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