In one embodiment a dispersive element is used to reflect the input beam at {HEAD ~ different angles} depending on {TAIL ~ the incident wavelength} 
depending on
In one embodiment a dispersive element is used to reflect the input beam at { HEAD ~ different angles } depending on { TAIL ~ the incident wavelength }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL