Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-09-04
1999-11-16
Bovernick, Rodney B.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 16, 359209, 359566, G02B 2610, G02B 532
Patent
active
059867787
ABSTRACT:
Bow can be minimized by an auxiliary grating in a post deflection path of the diffracted beam from the hologon which is disposed in non-parallel relationship to the plane of rotation of the hologon. The ellipticity of the spot which generates the scan line and intensity variation in the scan beam can be minimized by using a dispersive element, preferably a prism, between the hologon and the bow compensation grating with its dispersion in a direction opposite to the direction of the dispersion of the hologon and of the auxiliary grating. Another grating before the hologon can be used to correct for wavelength shift induced cross-scan error associated with the dispersion in the hologon and a bow compensation grating following the hologon. A hologon deflector system may incorporate two identical prism elements of essentially the same shape and which are supported on the same body so that scan beam tracking errors associated with movement (vibration) of one of the prisms is compensated by the movement or vibration of the other.
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Bovernick Rodney B.
Holotek Ltd.
Lukacher Martin
Parsons David R.
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