The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
Opt Lett. 2011 Feb 15;36(4):505-7. doi: 10.1364/OL.36.000505.
We present universal formulas for the spectral and temporal output optical fields from a linear traveling-wave medium whose refractive index changes during its propagation within the medium. These formulas agree with known changes in central wavelength and energy that are associated with adiabatic wavelength conversion (AWC). Moreover, they reveal new changes to the optical pulses that have not been noticed, such as pulse compression and spectral broadening. Most significantly, we find that AWC alters the pulse power, pulse chirp, and pulse delay. All of these effects depend on whether the central wavelength is blueshifted or redshifted, the first sign of asymmetry to be reported for AWC. These findings impact the applications of AWC to optical signal processing in microphotonic and nanophotonic structures as well as in lightwave systems.
我们提出了一种线性行波介质的光谱和时域输出光场的通用公式，该介质的折射率在介质内传播过程中发生变化。这些公式与与绝热波长转换（AWC）相关的中心波长和能量的已知变化一致。此外，它们揭示了以前未注意到的光脉冲的新变化，例如脉冲压缩和光谱展宽。最重要的是，我们发现 AWC 会改变脉冲功率、脉冲啁啾和脉冲延迟。所有这些影响都取决于中心波长是蓝移还是红移，这是 AWC 报告的第一个不对称迹象。这些发现影响了 AWC 在微光子和纳米光子结构以及光波系统中的光学信号处理中的应用。
