epi grade polished substrate for optical modules

{"cid":"91189418","title":"4-inch SGGG Large-Size Substrate, Gadolinium Gallium Garnet Single Crystal, (111) EPI-Grade Polished, Faraday Rotator for 1.6T\/CPO Optical Modules, High-Capacity Magneto-Optical Film Epitaxy","imgUrl":"https:\/\/img.chinax.com\/nimg\/ba\/70\/619d4faef2e234c9a98c416ce0d5-200x200-1.jpg","attrs":{"Brand Name":"Crystro","Model Number":"SCR-2026-08-26-03","Crystal Structure":"Cubic, space group Ia3d","Lattice Uniformity":"Full-wafer \u2264 0.003\u00c5","Dislocation Density":"\u2264 10 cm\u207b\u00b2\uff08 80% central area\uff09","Total Thickness Variation":"\u2264 6 \u03bcm","Flatness (Max-Min)":"\u2264 6 \u03bcm\uff0880% central effective area\uff09","Dielectric Constant":"\u03b5 \u2248 30","Place of Origin":"China","Lattice Constant":"12.497 \u00b1 0.003 \u00c5","Nominal Size":"4 inch (\u03a6101.6 mm)","Payment Terms":"T\/T,Western Union,MoneyGram","Surface Roughness":"Ra \u2264 1 nm\uff0cEPI ready"}}