Second harmonic generation with giant angular and spectral acceptance

Jacopo Parravicini*, Ludovica Falsi, Fabrizio Di Mei, Luca Tartara, Aharon J. Agranat, Eugenio Delre

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Frequency conversion and, more specifically, second harmonic generation, is a fundamental phenomenon in nonlinear optics, both for applications and fundamental research. The occurring of this last effect in crystals requires that the frequency-doubled propagating beam interferes constructively with the pump itself, a phase-matching (PM) condition which is due to momentum-conservation laws. These lead to wavelength-dependent constraints on the process geometry while the wavevector mismatch is accompanied by chromatic walk-off. Conversely, collinear PM in SHG can be obtained either through optical birefringence, which introduces wavelength and polarization constraints, and quasi-phase-matching, that requires periodic material microstructuring. We present the experimental demonstration of SHG with a spectral acceptance of more than 100 nm angular and acceptance up to ±40°, with no polarization selectivity or chromatic walk-off. This is achieved in a disordered potassium-based perovskite manifesting giant broadband refraction (GR), which determines a natural and unconditioned PM with no chromatic walk-off. Results open the way to highly efficient versatile and adaptable nonlinear optical devices.

Original languageAmerican English
Title of host publication2023 23rd International Conference on Transparent Optical Networks, ICTON 2023
EditorsMarek Jaworski, Marian Marciniak
PublisherIEEE Computer Society
Number of pages4
ISBN (Electronic)9798350303032
StatePublished - 2023
Event23rd International Conference on Transparent Optical Networks, ICTON 2023 - Bucharest, Romania
Duration: 2 Jul 20236 Jul 2023

Publication series

NameInternational Conference on Transparent Optical Networks
ISSN (Electronic)2162-7339


Conference23rd International Conference on Transparent Optical Networks, ICTON 2023

Bibliographical note

Publisher Copyright:
© 2023 IEEE.


  • angular acceptance
  • nonlinear optics
  • perovskite crystals
  • photonic devices
  • second-harmonic-generation
  • spectral acceptance


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