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在此以前，激光主放大器包括神光－ＩＩ试验装置，开始所使用的工作物质被称作Ｎ２１型磷酸盐钕玻璃，荧光寿命 ２５０ μｓ左右，受激发射截面 ３．５ｘ１０－２０ ｃｍ２．目前在神光－ＩＩ试验装置中所使用的工作物质被称作Ｎ３１型而酸盐钕玻璃，其荧光寿命为 ３３０ μｓ
Prior to this, the main laser amplifier, including SG-II test device, the beginning of the working substance used is called N21-type phosphate neodymium glass, fluorescent life of about 250 μs, stimulated emission cross section 3.5x10-20 cm2. The working substance currently used in SG-II is called the N31-type neodymium acid salt glass and has a fluorescence lifetime of 330 μs