Broadband colored-crescent generation in a single β-barium-borate crystal by intense femtosecond pulses

L. Wang, Y. X. Fan, H. Zhu, Z. D. Yan, H. Zeng, H.-T. Wang, S. N. Zhu, and Z. L. Wang
Phys. Rev. A 84, 063831 – Published 13 December 2011
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  • INTRODUCTION
  • EXPERIMENTAL SETUP
  • EXPERIMENTAL RESULTS AND DISCUSSION
  • CONCLUSION
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    A visible colored crescent with a bandwidth broader than 220 nm is observed experimentally by loosely focused femtosecond pulses in a bulk quadratic nonlinear crystal (β-BBO crystal) at certain incident angles. Through the analysis based on a simple collinear phase-matching model, we suggest that the colored crescent might be the coexistence of spontaneous parametric down-conversions (SPDCs) in the infrared range and the corresponding efficient second-order harmonic generations (SHGs) that occur in a wide spectrum. We further provide a possible mechanism for the SHG process in which the phase-mismatching angles of the frequency doubling of SPDCs in β-BBO crystal are assumed to be compensated by the strong diffraction effect during the self-focusing process of the generated intense SPDC signals.

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    • Received 24 April 2011

    DOI:https://doi.org/10.1103/PhysRevA.84.063831

    ©2011 American Physical Society

    Authors & Affiliations

    L. Wang1, Y. X. Fan1, H. Zhu1, Z. D. Yan1, H. Zeng2, H.-T. Wang1,3, S. N. Zhu1, and Z. L. Wang1,*

    • 1Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, 210093 Nanjing, China
    • 2State Key Laboratory of Precision Spectroscopy, East China Normal University, 200062 Shanghai, China
    • 3School of Physics, Nankai University, 300071 Tianjin, China

    • *zlwang@nju.edu.cn

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    Vol. 84, Iss. 6 — December 2011

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