An off-axis parabolic mirror converts plane waves into spherical ones and vice versa with high accuracy. This aspherical mirror is indispensable for spectrometers and astronomical optical instruments which require high resolution.
When a spherical mirror is used under off-axis conditions, spherical and coma aberrations occur, which cause the degradation of resolution of a spectrometer. Off-axis parabolic mirrors theoretically eliminates these aberrations and ensures
high resolution even in a short focal length compact spectrometer.
The off-axis parabolic surface used in Shimadzu off-axis parabolic mirrors is, when expressed mathematically, a part of a rotary symmetric parabolic surface represented by Y = X2/4F (where, F: focal length, Y is the rotary symmetric axis and X is the displacement on the axis.)
|Tolerance in external dimension (W and H)||0/-0.2mm|
|Tolerance in central thickness (T)||±0.2mm|
|Tolerance in focal length (on axis)||±0.5%|
|Tolerance in axis displacement||±2mm|
|Surface accuracy||with in λ /2 (λ=632.8nm)|
|Blank material||Soda glass|
|Effective area||Ref table|
|Scratches & digs(in accordance with MIL-0-13830A)||80-50|
|Storage temperature||0°C -50°C|
|Storage humidity (with no condensation)||80% RH or less|
f ' (mm)
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