Konda Srinivasa Rao, Ganeev Rashid A, Kim Vyacheslav V, Ketavath Ravi, Yu Jiaqi, Li Wei
GPL photonics laboratory, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, People's Republic of China.
Laboratory of Nonlinear Optics, Institute of Astronomy, University of Latvia, Jelgavas iela 3, Riga, LV-1004, Latvia.
Nanotechnology. 2022 Nov 18;34(5). doi: 10.1088/1361-6528/ac9fdb.
We demonstrate high-order harmonic generation in Ni-doped CsPbBrperovskite nanocrystals ablated by nanosecond pulses using chirp-free 35 fs, and chirped 135 fs pulses in the case of single-color pump (800 nm) and a two-color pump (800 and 400 nm). We analyzed the spectral shift, cut-off, and intensity distribution of harmonics in the case of chirped drving pulses compared to chirp-free pulses. It is shown that the presence of Ni dopants and CsPbBrplasma components improves the harmonics emission. Also, we measured the third-order nonlinear optical (NLO) properties of these nanocrystals using 800 nm, 60 fs, 1 kHz pulses. The variations of measured NLO parameters of CsPbBrperovskite nanocrystals containing different concentrations of nickel correlate with variations of generated high-order harmonics from laser induced plasmas of studied nanocrystals in terms of harmonics intensity, cut-off, and spectral shift (in case of chirped driving pulses). The spectral shift of the harmonics generated from the Ni-doped CsPbBrperovskite nanocrystals can be used to form tunable extreme ultraviolet sources.
我们展示了在使用无啁啾35飞秒和啁啾135飞秒脉冲的纳秒脉冲烧蚀的掺镍CsPbBr钙钛矿纳米晶体中产生的高次谐波，这是在单色泵浦（800纳米）和双色泵浦（800和400纳米）的情况下。我们分析了与无啁啾脉冲相比，啁啾驱动脉冲情况下谐波的光谱位移、截止和强度分布。结果表明，镍掺杂剂和CsPbBr等离子体成分的存在改善了谐波发射。此外，我们使用800纳米、60飞秒、1千赫兹脉冲测量了这些纳米晶体的三阶非线性光学（NLO）特性。在谐波强度、截止和光谱位移（在啁啾驱动脉冲的情况下）方面，含有不同镍浓度的CsPbBr钙钛矿纳米晶体的测量NLO参数的变化与所研究纳米晶体的激光诱导等离子体产生的高次谐波的变化相关。掺镍CsPbBr钙钛矿纳米晶体产生的谐波的光谱位移可用于形成可调谐极紫外光源。
