Wavelength sensitive beam combiner with aberration correction

Details Wavelength sensitive beam combiner with aberration correction Wavelength sensitive beam combiner with aberration correction

1998-07-17

2000-03-28

Spyrou, Cassandra

Optical: systems and elements

Diffraction

From grating

359637, 359 16, 369 4437, 369112, G02B 518, G02B 2744

Patent

active

060439351

ABSTRACT:
A wavelength sensitive hologram which combines the 780 nm laser beam and the 650 nm laser beam to produce a compact DVD optical pickup. The 780 nm laser beam is incident on the hologram at an angle so that the first order diffraction from the hologram propagates along the optical axis of the hologram. The wavefront recorded on the hologram also contains aberration correction components so that the focused 780 nm laser beam on the CD substrate is nearly perfect or at least diffraction limited. The 650 nm laser beam is incident normal to the hologram plane so that the 0 order diffraction of the 650 nm laser beam remains propagating along the optical axis of the hologram.

REFERENCES:
patent: 5754512 (1998-05-01), Komma
patent: 5875167 (1999-02-01), Katayama
Wai-Hon Lee, "Holographic grating scanners with aberration corrections," Applied Optics, vol. 16, No. 5, pp. 1392-1399, May 1977.

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