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arXiv physics/0611292physics.optics
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自成像硅拉曼放大器

Self-imaging silicon Raman amplifier

Varun Raghunathan, Hagen Renner, Robert R. Rice, Bahram Jalali

摘要:

提出了一种新型的波导光放大器。该装置由共线传播的泵浦和放大的斯托克斯光束与周期性成像的斯托克斯光束由于塔尔博特效应。讨论了该器件作为中波红外(MWIR)遥感图象放大器的应用,并描述了它的性能。硅材料由于其优良的透射特性、高热导率、高损伤阈值和成熟的制备技术而成为中波红外应用的首选材料。在这些装置中,拉曼放大过程还包括泵浦和斯托克斯信号的各种空间模式之间的四波混频。这种现象对于多模波导中的非线性相互作用是独特的,并且对最大可实现增益施加了限制,超过该限制,图像开始失真。图像失真的另一个来源是与泵浦具有最高重叠的斯托克斯模式的优先放大。这些效应引入了增益和图像质量之间的折衷。我们表明,这种权衡的一个可能的解决方案是限制泵到一个单一的高阶波导模式。

英文摘要:

We propose a new type of waveguide optical amplifier. The device consists of collinearly propagating pump and amplified Stokes beams with periodic imaging of the Stokes beam due to the Talbot effect. The application of this device as an Image preamplifier for Mid Wave Infrared (MWIR) remote sensing is discussed and its performance is described. Silicon is the preferred material for this application in MWIR due to its excellent transmission properties, high thermal conductivity, high damage threshold and the mature fabrication technology. In these devices, the Raman amplification process also includes four-wave-mixing between various spatial modes of pump and Stokes signals. This phenomenon is unique to nonlinear interactions in multimode waveguides and places a limit on the maximum achievable gain, beyond which the image begins to distort. Another source of image distortion is the preferential amplification of Stokes modes that have the highest overlap with the pump. These effects introduce a tradeoff between the gain and image quality. We show that a possible solution to this trade-off is to restrict the pump into a single higher order waveguide mode.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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