Patent ID: 7162136
Filing Date: 2007-01-09
Classification: G01J,G02B

Abstract:
1. An optical attenuator for attenuating light, comprising: a first polarizing element having a first polarization vector field that varies spatially across said first polarizing element; a second polarizing element having a second polarization vector field that varies spatially across said second polarizing element, wherein said first polarizing element and said second polarizing element are aligned in series, separated by a pre-defined distance, wherein said second polarization vector field is adapted to being in alignment with said first polarization vector field; and a mechanical means for attenuating light passing through said first polarizing element and said second polarizing element, wherein said mechanical means gradually translates said first polarizing element in relation to said second polarizing element such that said first polarization vector field is not in alignment with said second polarization vector field.