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Efficient operation of diode-pumped single-frequency thulium-doped fiber lasers near 2 (mu)m

机译：接近2μm的二极管泵浦单频掺th光纤激光器的高效运行

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摘要

Efficient operation of diode-pumped single-frequency fiber lasers at wavelengths from 1740 to 2017 nm has been demonstrated by using a very short piece of newly developed single-mode active fiber, i.e., heavily thulium-doped germanate glass fiber. At 1893 nm, the single-frequency fiber laser has a pump threshold of 30 mW, a slope efficiency of 35percent, and maximum output power of 50 mW with respect to the launched power of single-mode pump diodes at 805 nm. To the best of our knowledge, this is the highest lasing efficiency achieved in single-frequency fiber lasers operating near 2 (mu)m. Frequency noise of the single-frequency fiber laser at 1893 nm has been characterized and compared with that of single-frequency fiber lasers at 1 and 1.55 (mu)m.
机译：通过使用非常短的新开发的单模有源光纤（即重掺ul的德国锗玻璃光纤），可以证明二极管泵浦的单频光纤激光器在1740至2017 nm波长范围内的高效运行。相对于在805 nm处的单模泵浦二极管的发射功率，单频光纤激光器在1893 nm处的泵浦阈值为30 mW，斜率效率为35％，最大输出功率为50 mW。据我们所知，这是在2 µm附近工作的单频光纤激光器中达到的最高激光效率。已经表征了1893nm的单频光纤激光器的频率噪声，并将其与1和1.55μm的单频光纤激光器的频率噪声进行比较。

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