Patent ID: 7830512
Filing Date: 2010-11-09
Classification: G01J,G01N,G02B

Abstract:
1. A system for controlling the intensity of a beam of electromagnetic radiation as a function of wavelength comprising a source (LS) of a beam of polychromatic electromagnetic radiation and a sequence of control (P 2 ) polarizer and a beam polarizer (P), said control (P 2 ) and beam (P) polarizers being rotatable with respect to one another, such that in use the beam (P) polarizer is caused to set a polarization state in a beam exiting therefrom, and the control (P 2 ) polarizer is rotated with respect to said beam (P) polarizer to substantially uniformly control the intensity of wavelengths in the beam exiting the beam polarizer (P) over a spectrum of wavelengths; said system further comprising a control compensator (C) between said control (P