The percent of the incident radiant flux which is returned into the several orders has been measured for two aluminized gratings both as a function of wavelength and as a function of position on the grating surface. The effects of blaze angle and the reflectance of aluminum on the efficiency of the grating are discussed.
JAMES A. R. SAMSON, "Efficiency of Aluminized Gratings in the Spectral Range 555 to 1600 Å," J. Opt. Soc. Am. 52, 525-528 (1962)