The grating thickness limit l<sub>FP</sub> between the Raman–Nath and the Bragg diffraction regimes is calculated for an index grating placed in an asymmetric Fabry–Perot resonator with a totally reflecting back mirror and compared with that which was obtained for the same grating with no cavity l<sub>M</sub>. Owing to the increase of the effective interaction length inside the Fabry–Perot cavity, the stronger the front mirror reflectivity R<sub>1</sub> of the cavity, the smaller the thickness above which the whole diffracted intensity can be concentrated into one unique diffracted beam: l<sub>FP</sub>=[(1−√R<sub>1</sub>)/(1+√R<sub>1</sub>)]l<sub>M</sub>/2.
© 2002 Optical Society of America
Ludivine Menez, Isabelle Zaquine, Alain Maruani, and Robert Frey, "Bragg thickness criterion for intracavity diffraction gratings," J. Opt. Soc. Am. B 19, 965-972 (2002)