Patent ID: 7817272

Claim:
An apparatus for spectrally filtering at least one input beam, comprising: a first reflective element configured to tilt to multiple tilt orientations that each corresponds to a different angle of propagation of at least one input beam; one or more optical elements configured to change at least some of the relative angles of propagation of the input beam for different tilt orientations of the first reflective element; and a spectrally dispersive element configured to receive the input beam at a location at which the central ray of the input beam is incident at different points on the spectrally dispersive element for each of the tilt orientations, and configured to disperse spectral components of the input beam at different respective angles in a spectral plane; wherein the first reflective element is configured to tilt to select at least one and fewer than all of the dispersed spectral components to be directed to a selected output path.