Condenser lens, polarizing element, light source apparatus, and

Details Condenser lens, polarizing element, light source apparatus, and Condenser lens, polarizing element, light source apparatus, and

1995-04-26

1996-11-05

Dzierzynski, Paul M.

Optical: systems and elements

Polarization without modulation

Polarizarion by dichroism

359495, G02B 530

Patent

active

055723624

ABSTRACT:
A light source apparatus of reduced thickness and high extinction ratio employs a series of columnar component elements of rhomboidal cross section. Incident and emergent surfaces are formed in periodic folds with each fold arranged for light incidence at and angle equal to or greater than the Brewster angle. At the Brewster angle, P-polarized light is transmitted without loss. For incidence at an angle greater than the Brewster angle, the transmittance of the S-polarized light is decreased with a slight decrease in transmittance of the P-polarized light, for a net increase in the extinction ratio. By using a multilayer structure, the extinction ratio is further increased. By inclusion of an ultraviolet/infrared cut-off filter and forced cooling, deterioration and deformation of the polarizing element are reduced. Arrangement of the layers with spacers and air layers prevents a decrease in extinction ratio due to multiple reflections.

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"Laser and Optics Guide II" Japan Melles Griot Inc., pp. 122-124, Jun. 1989 .

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