Laser beam optical scanner

Details Laser beam optical scanner Laser beam optical scanner

1994-04-22

1996-08-27

Moskowitz, Nelson

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 18, 359566, 25022726, G03H 122, G02B 3610, G02B 532

Patent

active

055506550

ABSTRACT:
A laser beam passes through two holograms or through a hologram twice to reduce the ratio .lambda./d so that P-polarized light, as well as S-polarized light, can be diffracted with high diffraction efficiency and uses a hologram or holograms formed on a base plate and facilitates the separation of a stamper from the base plate in producing replicas of the hologram. A laser beam (5) passes through two holograms formed on a transparent base plate or through a hologram formed on a transparent base plate twice. The ratio .lambda./d, where .lambda. is the wavelength of the laser beam and d is the grating constant of the hologram, is in the range of 0.4 to 1.1.

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