Center for Optical Technologies and Physics Department, Lehigh University, Bethlehem, Pennsylvania 18015, USA.
Opt Lett. 2011 Sep 1;36(17):3437-9. doi: 10.1364/OL.36.003437.
A solid-core tellurite glass fiber with 1.8 dB/m loss at 1.55 μm was made by using the built-in casting preform fabrication method and rod-in-tube fiber drawing technique. Pumping a 10 cm fiber piece with picosecond pulses of 3-5×10(12) W/cm(2), 0.1% of the fundamental power limited by the coherence length of 0.3-5 μm was converted into visible third-harmonic power tunable over a broad near-IR wavelength ranging from 1500 to 1680 nm. Frequency conversion from the mid-IR to near-IR was found to be even more efficient due to the longer coherence lengths of 12-20 μm in the wavelength range of 2200-2500 nm.
采用内置浇铸预制件制造法和棒管拉丝技术，制造出损耗为 1.8dB/m 的碲酸盐玻璃实芯光纤，在 1.55μm 处。用皮秒脉冲（3-5×10(12)W/cm(2)）对 10cm 光纤进行抽运，在 0.3-5μm 的相干长度限制下，0.1%的基频功率转换为可见三谐波功率，可调谐至 1500nm 至 1680nm 的宽近红外波长范围。在 2200nm 至 2500nm 的波长范围内，由于相干长度为 12-20μm，从中红外到近红外的频率转换效率更高。
