Diffraction grating interferometers, under extended source monochromatic illumination and with appropriate spatial filtering, are seen to be essentially imaging systems, linear in amplitude. By broadening the spectrum of the illumination, the system becomes linear in irradiance.
© 1985 Optical Society of America
Emmett N. Leith and R. Hershey, "Transfer functions and spatial filtering in grating interferometers," Appl. Opt. 24, 237-239 (1985)