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Home > Off-Axis Mirrors > 14TM - Toroidal Mirrors
Toroidal Mirrors
Often used in monochromators based on Czerny-Turner optical scheme

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
MaterialZerodur, Astrositall, FS, ULETM , Si, Cu, Al, Pyrex, BK7
Wavelength range, nm9 - 200
Dimensions, mmup 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 - transverse0.3 - longtitudal, 0.8 - transverse
Shape accuracy @ 632.8 nm≤λ/30λ/100