Nonlinear optical spectrum of diamond at femtosecond regime.
Nonlinear optical spectrum of diamond at femtosecond regime.
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DOI：
10.1038/s41598-017-14748-4
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发表时间：
2017-10-30
影响因子：
4.6
通讯作者：
Mendonça CR
中科院分区：
文献类型：
--
作者：
Almeida JMP;Oncebay C;Siqueira JP;Muniz SR;De Boni L;Mendonça CR
虽然金刚石光子学已经引起了人们的极大兴趣和有用的应用，如频率产生器件和单光子发射器，但对金刚石三阶光学非线性的基础研究仍然很少，阻碍了非线性和量子光学集成平台的发展。本文的目的是通过测量金刚石的双光子吸收系数（β）和非线性折射率（n2）的光谱，在较宽的光谱范围内为这些研究做出贡献。这些测量结果表明，β的大小从0.07增加到0.23 cm/GW，当它接近带隙能量时，在3.18到4.77 eV（390-260 nm）的区域内，而n2在0.83-4.77 eV（1500-260 nm）的整个测量范围内从0变化到1.7 × 10−19 m2/W。实验结果与间接带隙半导体非线性吸收和折射的理论模型进行了比较，表明双光子吸收是三阶非线性极化率色散的主导效应。这些数据，连同光学克尔门测量，也在这里提供，是最重要的相关性的理解超快的光学过程中的金刚石及其非线性光学特性。
Although diamond photonics has driven considerable interest and useful applications, as shown in frequency generation devices and single photon emitters, fundamental studies on the third-order optical nonlinearities of diamond are still scarce, stalling the development of an integrated platform for nonlinear and quantum optics. The purpose of this paper is to contribute to those studies by measuring the spectra of two-photon absorption coefficient (β) and the nonlinear index of refraction (n2) of diamond using femtosecond laser pulses, in a wide spectral range. These measurements show the magnitude of β increasing from 0.07 to 0.23 cm/GW, as it approaches the bandgap energy, in the region from 3.18 to 4.77 eV (390–260 nm), whereas the n2 varies from zero to 1.7 × 10−19 m2/W in the full measured range, from 0.83–4.77 eV (1500–260 nm). The experimental results are compared with theoretical models for nonlinear absorption and refraction in indirect gap semiconductors, indicating the two-photon absorption as the dominant effect in the dispersion of the third-order nonlinear susceptibility. These data, together with optical Kerr gate measurements, also provided here, are of foremost relevance to the understanding of ultrafast optical processes in diamond and its nonlinear optical properties.
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