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Optical and Laser Devices
Aspherical Mirrors
Off-axis Parabolic Mirrors
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.)
Features
- Shimadzu off-axis parabolic mirrors are replicated by master mirrors that pass through rigorous inspections such as zone, Foucault, and interference tests.
- At the rear side of each mirror, a C mark is grooved to indicate the mounting direction (points to the rotary symmetric axis).
Standard Specifications
| 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 |
| Coating | Aluminum |
| 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 |
Standard Products
| Width W (mm) |
Height H (mm) |
Central thickness D (mm) |
Focal length (on axis) f (mm) |
Focal length (off axis) f ' (mm) |
0ff-axis angle (q ) |
Axis displacement A (mm) |
Vertical depth V (mm) |
Effective area (mm) |
Part No. (P/N) |
| 40 | 40 | 16 | 125.0 | 134.0 | 15 | 67.0 | 9.0 | j 36 | 205-84354 |
| 40 | 40 | 16 | 200.0 | 205.0 | 9 | 63.3 | 5.0 | j 36 | 205-84356 |
| 40 | 40 | 16 | 200.0 | 209.0 | 12 | 85.0 | 9.0 | j 36 | 205-84357 |
| 40 | 40 | 16 | 275.0 | 279.1 | 7 | 67.5 | 4.1 | j 36 | 205-84358 |
| 40 | 40 | 16 | 275.0 | 281.9 | 9 | 87.1 | 6.9 | j 36 | 205-84329 |
| 55 | 55 | 16 | 275.0 | 277.55 | 5.5 | 52.96 | 2.55 | j 50 | 205-84370 |
| 60 | 60 | 16 | 275.0 | 279.1 | 7 | 67.5 | 4.1 | j 55 | 205-84378 |
| 64 | 64 | 16 | 787.0 | 789.16 | 3 | 82.49 | 2.16 | j 60 | 205-84381 |
Schematic Outline
Applications
- Spectrometers
- Interferometers
- Astronomical optical instruments
- Spectrum analyzers
- Beam Expander and Beam Collimator
Examples of application in spectrometers
- Littrow-type spectrometer
- Czerny-Turner spectrometer
Optional Specification
- Off-axis parabolic mirrors with the following optional coating are available upon request
- Al + MgF2 (for vacuum ultraviolet)
- Au (for vacuum ultraviolet)
- Au (for infrared)
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