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PreprintCC BY 4.0arXiv

Shaping the spectra of second harmonic laser by spatial focusing

  • Yan-Ming Liu
  • Tao Xie
  • Xiangying Hao
  • Rui-Bo Jin
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Abstract

Accurately controlling the spectral width of second harmonic generation (SHG) is critical in applications such as nonlinear microscopy, ultrafast spectroscopy, and quantum optics, where tailored spectral properties are required. Although it is known that the focal length of the lens used to focus the pump beam influences the SHG spectrum, a simple and precise theoretical understanding of this effect has been lacking. Here, we develop a theoretical model to describe how pump focusing conditions affect SHG spectral broadening, and experimentally validate the model using BBO crystals with lenses of 50 mm and 200 mm focal lengths. Our results establish a practical method for engineering the SHG spectral width through pump focusing, providing valuable guidance for designing nonlinear optical systems with specific spectral requirements.

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Cite

BibTeXRIS
BibTeX
@misc{liu2026shaping,
  title = {{Shaping the spectra of second harmonic laser by spatial focusing}},
  author = {Yan-Ming Liu and Tao Xie and Xiangying Hao and Rui-Bo Jin},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.27011},
  eprint = {2610.27011},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.27011},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Shaping the spectra of second harmonic laser by spatial focusing
AU  - Yan-Ming Liu
AU  - Tao Xie
AU  - Xiangying Hao
AU  - Rui-Bo Jin
PY  - 2026
DA  - 2026/10/19
PB  - arXiv
DO  - 10.48550/arxiv.2610.27011
UR  - https://arxiv.org/abs/2610.27011
AB  - Accurately controlling the spectral width of second harmonic generation (SHG) is critical in applications such as nonlinear microscopy, ultrafast spectroscopy, and quantum optics, where tailored spectral properties are required. Although it is known that the focal length of the lens used to focus the pump beam influences the SHG spectrum, a simple and precise theoretical understanding of this effect has been lacking. Here, we develop a theoretical model to describe how pump focusing conditions affect SHG spectral broadening, and experimentally validate the model using BBO crystals with lenses of 50 mm and 200 mm focal lengths. Our results establish a practical method for engineering the SHG spectral width through pump focusing, providing valuable guidance for designing nonlinear optical systems with specific spectral requirements.
ER  -