Corbari Costantino, Gladyshev Alexey V, Lago Laure, Ibsen Morten, Hernandez Yves, Kazansky Peter G
Opt Lett. 2014 Nov 15;39(22):6505-8. doi: 10.1364/OL.39.006505.
All-fiber ns-pulsed visible laser at λ=521 nm is realized by frequency doubling an Yb-doped fiber laser with a periodically poled silica fiber. A 50-mW second-harmonic (SH) output power is produced that is over 6-orders of magnitude greater than previous results obtained with poled fibers in the visible spectral range. The normalized conversion efficiency of 0.3%/W is to date the largest demonstrated with poled fiber technology. Furthermore, 21% conversion efficiency is achieved for the doubling of 8-ps pulses from a neodymium-doped yttrium vanadate solid-state laser. The advances are made possible by the precision and flexibility offered by using the continuous periodic UV erasure, as opposite to photolithographic methods, for the fabrication of over 20-cm-long χ(2)-gratings for quasi-phase matched SH generation.
通过使用周期性极化石英光纤对掺镱光纤激光器进行倍频，实现了波长为λ=521 nm的全光纤纳秒脉冲可见激光器。产生了50 mW的二次谐波（SH）输出功率，比之前在可见光谱范围内使用极化光纤获得的结果高出6个数量级以上。0.3%/W的归一化转换效率是迄今为止极化光纤技术所展示的最高值。此外，对于掺钕钒酸钇固态激光器的8 ps脉冲倍频，实现了21%的转换效率。与光刻方法相反，通过使用连续周期性紫外擦除技术来制造长度超过20 cm的用于准相位匹配SH产生的χ(2)光栅，这种精度和灵活性使得这些进展成为可能。
