Diffraction efficiency is proportional to the square of the index modulation times the effective thickness.
Compare to the modulation index for frequency modulation.
Frequency modulation | Science Citation Index | Human Development Index | Roud Folk Song Index | Index Ventures | frequency modulation | index | Pulse-width modulation | modulation | Index term | Index on Censorship | Index Librorum Prohibitorum | Single-sideband modulation | LuxX Index | Index (publishing) | Index (database) | Index | FTSE 250 Index | Frequency Modulation | Cook Partisan Voting Index | Amplitude modulation | AEX index | A Certain Magical Index | Stock market index | stock market index | modulation (music) | Modified Frequency Modulation | Miller index | index.hu | Gunning fog index |