The GAGG crystals have been extensively researched as a host lattice for phosphorescent materials, and a great deal of technology has been developed to grow high-quality crystals . Besides Ce 3+ -activated GAGG single crystals , various other trivalent lanthanoid ions , such as Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Tb 3+ , Ho 3+ , Er 3+ , Tm 3+ , and Yb 3+ have been incorporated into GAGG crystals to improve their optical and luminescence properties for specific applications, including laser materials, phosphors, and high-resolution optical systems, with the aim of optimizing light emission characteristics and energy transfer efficiency [10d, 11a, 14] . So far, the effect of the replacement of Al 3+ by the In 3+ atom in the garnet structure on optical properties has only been scarcely studied. In 1993, Kawata et al. carried out research on GIGG single crystal material. In this study, the optical float zone method has also been used, but due to the high energy required in the process of collecting the energy provided by the halogen lamp in a single point in transparent materials, high temperatures have been reached, and In2O3 evaporation could not be controlled at such temperatures. For this reason, GIGG single crystals were non-stoichiometric . In addition, only the B site has been studied to be substituted by Cr 3+ . For GIGG, there is no research on A site substitution by luminescent trivalent lanthanoid ions, though these ions are relevant for the applications mentioned in the previous paragraph. Nd 3+ (4f 3 ), Ho 3+ (4f 10 ) are known activators based on their dominant emission in a selective spectral range in 4f n -4f n narrow transitions. All three cations demonstrate distinct properties that make them in principle suitable for laser applications. Nd 3+ has a dominant 4 F3/2 → 4 I11/2based emission line at ~ 1064 nm utilized in solid-state lasers. Other NIR emissions lines are at ~ 1340 nm ( 4 F3/2 → 4 I13/2) and ~ 880 nm ( 4 F3/2 → 4 I9/2). . Nd-activated YAG is a primary candidate for a four-level laser based on its excellent properties .