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超短线性腔是实现单频激光稳定输出的最简单的结构,针对石英玻璃光纤掺杂离子浓度低、输出功率小的缺点,选择对稀土离子具有较高溶解度的磷酸盐玻璃作为增益介质,研究了Yb3+掺杂磷酸盐玻璃(P2O5-B2O3-K2O-BaO-Al2O3-Nb2O5-Sb2O3)的光谱特性,解决了Yb2O3高浓度掺杂和提高Yb3+荧光寿命的问题。实验表明磷酸盐玻璃对Yb2O3溶解度摩尔分数可达6%(质量分数为15.5%);通过除水技术,Yb3+离子2F5/2能级的寿命达到1.84 ms。在此基础上采用管棒法拉制出了磷酸盐玻璃单模光纤,通过光栅选频,利用1.4 cm光纤实现了中心波长1063.5 nm,功率51.6 mW的单频激光输出。
The ultra-short linear cavity is the simplest structure for stable output of single-frequency laser. According to the disadvantage of low concentration and low output power of quartz glass fiber, phosphate glass with high solubility for rare earth ions is chosen as the gain medium. The spectral characteristics of Yb3 + -doped phosphate glass (P2O5-B2O3-K2O-BaO-Al2O3-Nb2O5-Sb2O3) solved the problem of high Yb2O3 doping and increasing the fluorescence lifetime of Yb3 +. Experiments show that the solubility of phosphate glass to Yb2O3 molar fraction of up to 6% (mass fraction of 15.5%); through the water removal technology, Yb3 + ion 2F5 / 2 energy level life of 1.84 ms. On this basis, the phosphate glass single mode fiber was drawn by pipe sticking method. The single frequency laser output with center wavelength of 1063.5 nm and power of 51.6 mW was achieved by grating selection with 1.4 cm fiber.