A multichannel interferometer that uses a rotating grating to both disperse and Doppler shift an incident far-infrared laser beam is described. The laser beam is diffracted into a fan array of many (~ 10) beams that can be directed to probe the plasma along distinct chords. The phase-shift information is multiplexed in the frequency domain so that a single detector suffices to sense the recombined probing beams.
© 1992 Optical Society of America
Original Manuscript: December 3, 1990
Published: April 1, 1992
John Howard, "Multiorder rotating grating interferometer," Appl. Opt. 31, 1419-1425 (1992)