大尺寸连熔N31型掺钕磷酸盐激光玻璃的性能研究

Properties of Large Size N31 Nd:Phosphate Laser Glass Prepared by Continuous Melting

报道了磷酸盐激光钕玻璃的连续熔炼线，以及采用连续熔炼工艺获得的400mm口径N31钕玻璃的主要性能。连熔所制备的N31-35钕玻璃的掺杂离子浓度为3．47（±0．02）×10^20cm^-3；1053nm处的折射率为1．5336~0．0005；400nm处的吸收系数平均值为O．098cm～；1053nm处的激光波长损耗为0．13～0．15％cm～；3000cm^-1处的吸收系数平均值为0．83cm^-1。400mm口径连熔N31钕玻璃的透射波前畸变在633nm处小于A／3波长。采用1053nm、脉冲为3ns激光作用下连熔钕玻璃的体破坏阈值大于40J／cm^2。结果表明，在N31钕玻璃的连续熔炼工艺中，除铂金和除水都取得了很好的效果。

The continuous melting technology is reported. The 400 mm aperture N31 Nd：phosphate laser glass prepared from continuous melting technology is fabricated. The main properties of N31-35 glass have been disclosed. Its Nd3^＋ ion concentration is 3.47 （±0.02）×10^20 cm^-3. The refractive index at 1053 nm is 1.5336± 0.0005. The absorption coefficients at 400 nm and 3000 cm^-1, the laser wavelength loss at 1053 nm are 0.098 cm^-1 and 0.83 cm^-1, 0.13-0.15% cm^-1, respectively. The PV value of transmitted wavefront is less than h/3 at 633 nm. Its bulk damage threshold with 1053 nm, 3 ns pulse laser is larger than 40 J/cm^2. The results indicate that the dehydration and platinum particle removing processes are very effective during the continuous melting.