Patent ID: 6870679
Filing Date: 2005-03-22
Classification: G02B

Abstract:
1. An optical device comprising: a) at least one multilayer interference filter disposed for receiving a first collimated optical beam having a first cross-section dimension at non normal incidence and reflecting the optical energy in said first collimated optical beam as a second collimated beam having a second cross-section dimension, wherein said at least one multiplayer interference filter provides wavelength dependent group delay providing chromatic dispersion compensation to wavelengths in the first collimated optical beam, and wherein said at least one multiplayer interference filter causes a beam broadening in said second collimated beam due to a walk-off of certain wavelengths therein, and b) at least one mirror for receiving the second collimated optical beam, wherein said at least one mirror is oriented to reflect said second collimated optical beam back to said at least one multiplayer interference filter to substantially compensate for the beam broadening, whereby a third collimated optical beam is generated, the third collimated optical beam having substantially the same optical energy and cross-section dimension as said first collimated optical beam.