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利用1 cm长铒镱共掺高掺杂磷酸盐玻璃光纤制成直线型短腔光纤激光器,获得单频窄线宽、较大功率的激光输出。测量了输出功率随激光器热沉温度变化的特性;激光器热沉温度控制在11℃时,斜率效率可达24%;抽运功率为415 mW时,输出功率可达79 mW。光谱测试显示在1534 nm单纵模工作,边模抑制比(SMSR)大于50 dB。用零差法测得线宽为4.5 kHz。用低精细度法布里-珀罗(F-P)干涉方法,测量了磷酸盐玻璃光纤的折射率和热光系数分别为1.5195和-5.4×10~(-6)℃~(-1),并测得激光器在高抽运功率下斜率效率降低,输出功率呈亚线性上升的特性。对这一现象及其温度关系进行了定性分析和讨论。
The linear short-cavity fiber laser is fabricated by using 1 cm-long erbium-ytterbium co-doped highly doped phosphate glass fiber to obtain a single-frequency narrow-linewidth and relatively high-power laser output. The output power is measured with the change of the laser heat sink temperature. The slope heat efficiency can reach 24% when the laser heat sink temperature is controlled at 11 ℃, and the output power can reach 79 mW at the pumping power of 415 mW. Spectral tests show that at 1534 nm single longitudinal mode, the side mode suppression ratio (SMSR) is greater than 50 dB. The line width is 4.5 kHz measured by homodyne method. The refractive index and the thermo - optic coefficient of the phosphate glass fiber were measured by using the low - fidelity Fabry - Perot (FP) interference method to be 1.5195 and -5.4 × 10 -6 ℃, respectively The measured laser efficiency decreases at high pumping power, and the output power shows a sublinear increase. The relationship between this phenomenon and its temperature has been qualitatively analyzed and discussed.