Two-photon absorption with vector Gaussian beams

IF 2 3区 物理与天体物理 Q3 OPTICS
Ferhat Kessi
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Abstract

In this study, we present an analytical model for nonlinear absorption processes utilizing vectorial Gaussian beams within the weak nonlinearity regime. We have developed an expression for normalized transmittance, encompassing both linear and second-order nonlinear absorption, while incorporating the axial field component of tightly focused beams. This model, contextualized within the Z-scan technique framework, enables precise characterization of nonlinear absorption coefficients. Our simulations examine the effects of various polarization states and beam focusing characteristics on nonlinear absorption. The results unveil nuanced differences in nonlinear absorption among linearly polarized, circularly polarized, and unpolarized light. Notably, increasing the beam divergence angle results in broader transmittance curves, while the nonlinear absorption magnitude remains relatively stable. These findings underscore the significance of considering the full vectorial nature of tightly focused beams in nonlinear optics. Our model elucidates the intricate relationship between beam properties and nonlinear responses, with implications for applications such as nonlinear microscopy, optical limiting, and advanced photonic device development.

Abstract Image

矢量高斯光束的双光子吸收
在这项研究中,我们提出了一个非线性吸收过程的解析模型,利用向量高斯光束在弱非线性区。我们已经开发了归一化透射率的表达式,包括线性和二阶非线性吸收,同时结合紧密聚焦光束的轴向场分量。该模型,在z扫描技术框架内,能够精确表征非线性吸收系数。我们的模拟研究了不同偏振态和光束聚焦特性对非线性吸收的影响。结果揭示了线性偏振光、圆偏振光和非偏振光在非线性吸收方面的细微差别。值得注意的是,增加光束发散角,透射率曲线变宽,而非线性吸收幅度保持相对稳定。这些发现强调了在非线性光学中考虑紧密聚焦光束的完全矢量性质的重要性。我们的模型阐明了光束特性和非线性响应之间的复杂关系,对非线性显微镜、光学限制和先进光子器件开发等应用具有重要意义。
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来源期刊
Applied Physics B
Applied Physics B 物理-光学
CiteScore
4.00
自引率
4.80%
发文量
202
审稿时长
3.0 months
期刊介绍: Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.
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