Afocal systems to generate multiple foci in zone of focal plane of an F-theta lens
Applications:


| Description | Afocal system to provide 1, 2, 4, 8 foci near focus of F-Θ lenses | ||||
| Focal length of F-Θ lenses (examples) | f’ = 100 mm | f’ = 160 mm | |||
| ΔF, μm (8 foci layout) |
step | total, from 1st to 8th | step | total, from 1st to 8th | |
| air | 30 | 210 | 77 | 538 | |
| Glass (x1.5) | 45 | 315 | 115 | 805 | |
| Al2O3 (x1.8) | 53 | 370 | 135 | 945 | |
| Clear Aperture, mm | 20 | ||||
| Numerical aperture (NA) | 0.1 | 0.063 | |||
| Spectral band, nm | _1030: 1020 - 1080 _343/515: 335 - 365, 510 - 540 other wavelengths on request |
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| 2ω, μm waist in air by D1/e² = 14 mm, M² = 1 |
1030 nm | 9.4 | 15.0 | ||
| 515 nm | 4.7 | 7.5 | |||
| 343 nm | 3.1 | 5.0 | |||
| Angular field of view | ± 3° | ||||
| Working Distance | focal plane of F-Θ lens | ||||
| Recommended maximum pulse energy | 25 mJ at 5 ns | ||||
| Mounting | C-Mount (1” -32 UN 2A), at entrance and exit | ||||
| Diameter, mm | 54 | ||||
| Length, mm | 59 | ||||
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* ΔF in material is n times larger than in air, where n is refractive index of the material: * The foXXus systems create 1, 2, 4 or 7 along the optical axis in focus zone of a focusing lens * Changing ΔF through rotation of adjustment rings * The crack inside material is typically longer than ΔF defined by optical design |
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