Optical beam shaper, and radiation source unit and scanning devi

Details Optical beam shaper, and radiation source unit and scanning devi Optical beam shaper, and radiation source unit and scanning devi

1995-06-07

2000-08-22

Westin, Edward P.

Optical: systems and elements

Lens

Including a nonspherical surface

359708, G11B 700

Patent

active

061081388

ABSTRACT:
An optical beam shaper (10) for converting a radiation beam (5, 6, 7, 8) having an elliptical cross-section into a beam (9) having a more circular cross-section is described. This element (10) has a cylindrical entrance surface (12) and a toroidal exit surface (14) and can be arranged close to a diode laser (1) so that the risk of wavefront deviations due to defocusing is reduced. The element has a high coupling efficiency. The beam shaper is also provided with a grating for forming a sub-beam from the radiation beam.

REFERENCES:
patent: 3876842 (1975-04-01), Bouwhuis
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4924079 (1990-05-01), Opheij et al.
patent: 5068751 (1991-11-01), Braat et al.
patent: 5467335 (1995-11-01), Braat
M.G. et al, "Het systeem `Compact Disc Digital Audio`", Philips Techn T. 40, 82, No. 9, 1981, pp. 267-272.

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