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