GSGG (Gd3Sc2Ga3O12) is a garnet-based crystal substrate material that is commonly used in a variety of applications, including laser systems, solid-state lasers, and optical amplifiers. GSGG substrates are known for their high thermal conductivity, good mechanical strength, and large nonlinear optical coefficients, which make them ideal for many laser and optical applications. The high thermal conductivity of GSGG enables efficient cooling of laser components, while its good mechanical strength ensures stability under high power densities. The large nonlinear optical coefficients of GSGG make it useful for a wide range of nonlinear optical applications, such as frequency doubling and harmonic generation.