Avrutsky Ivan, Soref Richard, Buchwald Walter
Department of Electrical and Computer Engineering, Wayne State University, Detroit, Michigan 48202, USA.
Opt Express. 2010 Sep 13;18(19):20370-83. doi: 10.1364/OE.18.020370.
Integrated chip-scale optical systems are an attractive platform for the implementation of non-linear optical interactions as they promise compact robust devices that operate reliably with lower power consumption compared to analogs based on bulk nonlinear crystals. The use of guided modes to facilitate nonlinear parametric interactions between optical fields, as opposed to bulk beams, has certain implications on optical parametric oscillations, the most important of which are additional methods for achieving phase synchronism and reduced threshold power due to the tight confinement associated with the guided modes. This work presents a theoretical investigation on the use of polarization dependent mode dispersion in guided wave structures as a means to achieve non-linear parametric oscillations from continuous wave sources with outputs in the mid-infrared region of the spectrum. An Al(2)O(3)/GaP/Al(2)O(3) waveguide system is investigated and shown to produce parametric oscillations at 3 µm to 5 µm from 1 µm to 2 µm input waves utilizing 0.14 µm to 0.30 µm GaP cores. The threshold power is shown to be 320 × less than that obtainable using more traditional quasi-phase matched bulk crystals over the same wavelength range.
集成芯片级光学系统是实现非线性光学相互作用的一个有吸引力的平台，因为它们有望制造出紧凑、坚固的器件，与基于块状非线性晶体的类似器件相比，这些器件能以更低的功耗可靠运行。与块状光束相反，利用导模来促进光场之间的非线性参量相互作用，对光学参量振荡有一定影响，其中最重要的是实现相位同步的额外方法以及由于与导模相关的紧密限制而降低的阈值功率。这项工作对在导波结构中使用偏振相关模色散作为从连续波源实现非线性参量振荡的一种手段进行了理论研究，其输出在光谱的中红外区域。研究了一种Al(2)O(3)/GaP/Al(2)O(3)波导系统，结果表明，利用0.14 µm至0.30 µm的GaP纤芯，该系统在1 µm至2 µm的输入波作用下，能在3 µm至5 µm产生参量振荡。结果表明，在相同波长范围内，其阈值功率比使用更传统的准相位匹配块状晶体可获得的阈值功率低320倍。
