Herein, we report two different dual-periodic Photonic Crystals (PCs) in dichromated gelatin emulsion which are
fabricated by four-beam holography and double-exposure holography. The minibands with high Q-factors have been
evidently located in both two structures. By taking into account the non-uniform distribution of material, the numerical
results agree quite well with the experimental results. We also compared the band-edge lasing in single-periodic PC and
miniband lasing in Moiré dual-periodic PC. Due to extremely flat dispersion and large mode volume of the miniband,
high optical conversion efficiency in miniband lasing is achieved as compared with that of band-edge lasing. Such effect
may provide potential applications in low-threshold lasers and ultra-sensitive fluorescent probes in biological assays.