期刊
ADVANCED PHOTONICS RESEARCH
卷 2, 期 7, 页码 -出版社
WILEY
DOI: 10.1002/adpr.202000019
关键词
femtosecond laser pulses; harmonic nanoparticles; nonlinear nanophotonics; nonlinear optics; pulse characterization; pulse propagation; random media
资金
- Deutsche Forschungsgemeinschaft (DFG) [IM37/11, INST 190/165 FUGG]
- Federal Ministry of Education and Research (BMBF) via German Academic Exchange Service [DAAD 57390412]
- National Research, Development and Innovation Fund of Hungary within the Quantum Technology National Excellence Program [2017-1.2.1-NKP-2017-00001]
The time-resolved nonlinear optical sum-frequency generation (SFG) of two differently colored, infrared (sub-)picosecond laser pulses was studied using lithium niobate nanoparticle pellets. The visible SFG emission exhibited an asymmetric pulse shape in the time domain, which can be used for an alternative type of an optical correlator and for predicting ultrashort pulse shapes inside nanoscaled, densely packed media with a nonlinear optical response.
Time-resolved nonlinear optical sum-frequency generation (SFG) of two differently colored, infrared (sub-)picosecond laser pulses is studied by means of nonlinear diffuse femtosecond-pulse reflectometry using lithium niobate nanoparticle pellets. The visible SFG emission exhibits an asymmetric pulse shape in the time domain which is explained within the framework of light propagation in random media. The analysis of the spectro-temporal data set indicates that LiNbO3 nanoparticle pellets can be used for an alternative type of an optical correlator, e.g., for the determination of a pulse's chirp parameter. This finding is generalized by means of numerical simulations. As a result, ultrashort pulse shapes can now be predicted inside nanoscaled, densely packed media with a nonlinear optical response on a comprehensive basis, giving rise to a number of prospective fields of applications.
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