Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation
Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation
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DOI：
10.1016/j.apsusc.2007.02.106
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发表时间：
2007-07-31
影响因子：
6.7
通讯作者：
Salathe, R.-P.
中科院分区：
文献类型：
--
作者：
Borca, C. N.;Apostolopoulos, V.;Salathe, R.-P.
我们报道了在未掺杂和掺镱的KY(WO4)2晶体内制备光通道波导，用于紧凑的固体激光器和三维光子器件。利用费莫秒激光脉冲的非线性吸收来诱导晶体的折射率变化。辐照损伤导致材料密度相对于周围体块降低。在这项工作中，在KY(WO4)(2)晶体中制备了两种类型的埋沟道波导。第一类（1型）是在辐照区附近形成的，这是由于存在诱导的压缩晶格应变，导致局部折射率增加。光可以更好地限制在第二种（类型11）通道波导中，这种波导是在成对的受损区域之间产生的。对于最佳受限通道（II型），在1 μ m处测量的传播损耗值为2-2.5 dB/cm。(c) 2007 Elsevier B.V.版权所有
We report on the fabrication of optical channel waveguides inside KY(WO4)2 crystals, both undoped and Yb-doped, for applications in compact solid-state lasers and three-dimensional photonic devices. Nonlinear absorption of fermosecond laser pulses has been employed in order to induce refractive-index changes in these crystals. The irradiation damage results in a decrease of the material density compared to the surrounding bulk. In this work, two types of buried channel waveguides have been fabricated in the KY(WO4)(2) crystals. First ones (type 1) were formed in the vicinity of the irradiated regions due to the presence of an induced compressive lattice strain, which causes an increase of the local refractive index. Light can be better confined in the second (type 11) of channel waveguides that are created between pairs of damaged regions. For the best confined channels (type II), the propagation loss value measured at 1 mu m amounted to 2-2.5 dB/cm. (c) 2007 Elsevier B.V. All rights reserved.