Highly Er/Yb co-doped phosphosilicate fibers with low optical losses were fabricated by the MCVD method, utilizing an all-gas-phase deposition technique developed “in house.” Important characteristics such as photodarkening and photosensitivity of these fibers were thoroughly investigated. An almost negligible impact of photodarkening-induced losses (no more than 1 dB/m) was discovered in the near-infrared spectral region. The photosensitivity of hydrogen-loaded fiber samples was studied using excimer laser irradiation at a wavelength of 193 nm. A photoinduced refractive index value of ${1} \times {{10}^{- 3}}$ at the total UV irradiation exposure dose of $550\,\,{\rm J/cm}^{2}$ was achieved. A single-frequency laser with a Fabry–Perot short cavity was designed by inscribing highly reflective (${\rm R} \gt {99.9}\%$) and partially reflective (${\rm R} = {94.3}\%$) fiber Bragg gratings directly in the Er/Yb co-doped phosphosilicate fiber core. The laser showed stable CW output emitting with a narrow peak centered at 1551.5 nm in the absence of any signs of ${{\rm Yb}^{3 +}}$ parasite lasing in a wavelength range from 1000 to 1100 nm.

中文翻译：

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高灵敏度Er / Yb共掺杂磷硅酸盐光纤，用于连续波单频光纤激光器应用

利用“内部”开发的全气相沉积技术，通过MCVD方法制造了具有低光损耗的高Er / Yb共掺杂磷硅酸盐纤维。彻底研究了这些纤维的重要特性，例如光暗化和光敏性。在近红外光谱区域发现了光暗化引起的损耗（不超过1 dB / m）的影响几乎可以忽略。使用准分子激光辐射在193 nm波长下研究了含氢纤维样品的光敏性。在$ 550 \，\，{\ rm J / cm} ^ {2} $的总紫外线照射剂量下，光诱导的折射率值为$ {1} \乘以{{10} ^ {-3}} $。已实现。通过刻画高反射率（$ {\ rm R} \ gt {99.9} \％$）和部分反射率（$ {\ rm R} = {94.3} \％ $）光纤布拉格光栅直接位于Er / Yb共掺杂的磷硅酸盐光纤纤芯中。激光器显示出稳定的连续波输出，中心波长为1551.5 nm处有一个狭窄的峰，在1000至1100 nm的波长范围内没有任何{{{rm Yb} ^ {3 +}} $寄生激光的迹象。