Optically written gain gratings in inverted laser media are investigated both theoretically and experimentally. We present a transient analysis, valid in the nanosecond-pulsed regime, that permits calculation of the diffraction efficiency and profile of the gain grating within the medium for both transmission- and reflection-type gratings. Because of the laser amplification experienced by all interacting beams, greater-than-unity diffraction efficiency is achievable. Application to high-speed dynamic holography is demonstrated in flash-lamp-pumped Nd:YAG and compact diode-pumped Nd:YVO4 solid-state amplifiers.
A. Brignon, J.-P. Huignard, "Gain-Gratings and Dynamic Holography in Solid-State Laser Media" in Journal of Imaging Science and Technology, 1997, pp 474 - 481, https://doi.org/10.2352/J.ImagingSci.Technol.1997.41.5.art00005