Abstract
Phase-matching of light waves is a critical condition for maximizing the efficiency of nonlinear frequency conversion processes in nonlinear optical crystals; however, phase-matching, commonly achieved by tuning birefringence, is often difficult to achieve over a wide wavelength range. Here, full-wavelength phase-matching crystals that can avoid phase-mismatching across the entire optical transparency range are proposed. The anisotropic strength of bonding in the dimension of energy is confirmed theoretically to be the key to the full-wavelength phase-matching ability. We demonstrate that a crystal of guanidinium tetrafluoroborate (C(NH2)3BF4) can be phase-matched throughout its entire optical transparency range and is able to generate harmonic light as short as ~193.2 nm, which is close to its deep-ultraviolet cut-off edge. Importantly, this crystal is stable, cheap and efficient compared with commercially available nonlinear optical crystals for generation of 266 nm light. This work lays the foundation for finding a new class of crystals in which the phase-matching wavelength fully covers its optical transparency range, and also provides a high-performance crystal for generating light at 266 nm—the fourth-harmonic of a commercial 1,064 nm laser.
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The data that support the findings of this study are available from the corresponding author on reasonable requests.
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Acknowledgements
This work was financially supported by the National Key R&D Program of China (2021YFA0717800), National Natural Science Foundation of China (52002397, U2003131), West Light Foundation of CAS (XBZG-ZDSYS-202201, 2020-XBQNXZ-002), Young Elite Scientist Sponsorship Program by CAST (YESS20200068), Natural Science Foundation of Xinjiang (2022D01E087), Key Research and Development Program of Xinjiang (2022B01023-3), Key Research Program of Frontier Sciences, CAS (ZDBS-LY-SLH035), High-level Talent Project of Xinjiang Uygur Autonomous Region (2020000039), Xinjiang Tianshan Telent Program (2022TSYCCX0071), and CAS Project for Young Scientists in Basic Research (YSBR-024). We thank Z. Xu, S. Zhang and F. Zhang at Technical Institute of Physics and Chemistry, Chinese Academy of Sciences for their help with the tunable 193.2–200 nm light generation measurements; G. Zhang and B. Li at Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences for their help with 266 nm light generation and NLO coefficients test.
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M. Mutailipu proposed the idea and performed the data analysis and paper writing. J. Han grew the single crystals. Z. Li developed the theoretical calculations. F. Li and Z. Yang performed data analysis of theoretical results. J. Li and F. Zhang assisted with the optical performance characterization. X. Long supervised the crystal growth and the laser output experiments. S. Pan conceived the idea and supervised the project. All of the authors discussed the results and commented on the manuscript.
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Mutailipu, M., Han, J., Li, Z. et al. Achieving the full-wavelength phase-matching for efficient nonlinear optical frequency conversion in C(NH2)3BF4. Nat. Photon. 17, 694–701 (2023). https://doi.org/10.1038/s41566-023-01228-7
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DOI: https://doi.org/10.1038/s41566-023-01228-7
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