Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Theoretical Investigation of the Generation of Broad Spectrum Second Harmonics in Pna21-Ba3Mg3(BO3)3F3 Crystals

  • Kim, Ilhwan (Department of Applied Physics, Institute of Natural Science, Kyung Hee University) ;
  • Lee, Donghwa (Department of Applied Physics, Institute of Natural Science, Kyung Hee University) ;
  • Lee, Kwang Jo (Department of Applied Physics, Institute of Natural Science, Kyung Hee University)
  • Received : 2021.03.24
  • Accepted : 2021.06.21
  • Published : 2021.08.25
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Abstract

Borate nonlinear optical crystals have been used as frequency conversion devices in many fields due to their unique transparency and nonlinearity from ultraviolet to visible spectral range. In this study, we theoretically and numerically investigate the properties of broadband second harmonic generation (SHG) in the recently reported Pna21-Ba3Mg3(BO3)3F3 (BMBF) crystal. The technique is based on the simultaneous achievement of birefringence phase matching and group velocity matching between interacting waves. We discussed all factors required for broadband SHG in the BMBF in terms of two types of phase matching and group velocity matching conditions, the beam propagation direction and the corresponding effective nonlinearity and spatial walk-off, and the spectral responses. The results show that bandwidths calculated in the broadband SHG scheme are 220.90 nm (for Type I) and 165.85 nm (for Type II) in full-width-half-maximum (FWHM). The central wavelength in each case is 2047.76 nm for Type I and 1828.66 nm for Type II at room temperature. The results were compared with the non-broadband scheme at the telecom C-band.

Keywords

Acknowledgement

This study was supported by a grant from National Research Foundation of Korea (NRF-2019R1F1A1063937 and the Korea Institute of Science and Technology (KIST) (2E29580-19-147); Institute for Information & communications Technology Promotion (IITP) grant funded by the Korea government (MSIT) (No. 2020-0-00947).

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