CPC H04B 10/07957 (2013.01) [G01J 3/021 (2013.01); G01J 3/14 (2013.01); G01J 3/18 (2013.01); G01J 2003/1208 (2013.01)] | 20 Claims |
1. An optical device, comprising:
a dispersion element;
a reflective optic to reflect an optical beam with a fixed offset perpendicular to a dispersion direction of the dispersion element and with a negative offset in the dispersion direction of the dispersion element,
wherein the reflective optic is aligned to the dispersion element to offset an optical beam with respect to the dispersion element and to cause the optical beam to pass through the dispersion element on a plurality of passes, offsetting the optical beam on each of the plurality of passes; and
a reflective tuning element in an optical path of the dispersion element and the reflective optic.
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