报道了一种输出波长在1270 nm的混合级联掺磷拉曼激光器。该激光器分别利用掺磷光纤中频移为1330 cm-1和197 cm-1的拉曼散射，使1064 nm激光两次频移，实现了1270 nm激光输出。对1270 nm的二级拉曼光设计了对称和非对称两种腔结构，并进行了对比实验。结果表明，非对称结构可有效地避免腔内激光从高反端的泄漏，降低激光阈值，提高激光器转换效率。非对称结构激光器的振荡阈值为3.70 W，抽运功率为8.66 W时，激光器最大输出总功率为2.38 W，从1064 nm到1270 nm的激光转换效率为22%。

A hybrid cascaded phosphosilicate fiber Raman laser (RFL) with output wavelength of 1270 nm is proposed. By using 1330 cm-1 and 197 cm-1 Raman shift of phosphosilicate fiber, the laser of 1064 nm is shifted to 1270 nm. Symmetric and asymmetric cavity structure are designed for the second-order Stokes Raman light. The comparative experimental results show that the asymmetric structure can reduce oscillation threshold, improve conversion efficiency and avoid the optical leakage from the cavity in the high reflection end effectively. The oscillation threshold of asymmetric phosphosilicate RFL is 3.70 W, the maximum total output power is 2.38 W with the pump power of 8.66 W, the conversion efficiency from 1064 nm to 1270 nm is 22%.