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Ultrafast adiabatic second harmonic generation.

Asaf Dahan1, Assaf Levanon, Mordechai Katz

  • 1Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv, Israel.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|January 17, 2017
PubMed
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We developed a robust method for efficient ultrashort pulse conversion using adiabatic frequency conversion, accounting for nonlinear effects and experimental variations. This advanced technique ensures high performance in second harmonic generation, crucial for scientific research.

Area of Science:

  • Nonlinear optics
  • Quantum optics
  • Laser physics

Background:

  • Adiabatic frequency conversion is a key technique for ultrashort pulse manipulation.
  • Existing methods often struggle with the full nonlinear regime, including dispersion and multi-photon effects.
  • Second harmonic generation (SHG) is a fundamental nonlinear optical process with broad applications.

Purpose of the Study:

  • To generalize the adiabatic frequency conversion method for efficient ultrashort pulse conversion in the full nonlinear regime.
  • To analyze the impact of dispersion, two-photon absorption, Kerr effect, and phase mismatch on nonlinear optical processes.
  • To design and experimentally validate a robust and efficient second harmonic generation (SHG) process.

Main Methods:

  • Generalized adiabatic frequency conversion analysis incorporating dispersion, Kerr effect, and two-photon absorption.

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  • Numerical modeling for arbitrary three-wave interactions and phase-mismatched designs.
  • Experimental validation of the designed SHG process with various ultrashort pulses.

    • Main Results:

    • Demonstrated highly efficient and robust second harmonic generation (SHG) for ultrashort pulses.
    • Showcased robustness against >100 °C temperature variations, 75 nm bandwidth, and 300 fs to 3.5 ps chirp variations.
    • Identified critical dependence of adiabatic SHG design on pump intensity and crystal length.
    • Highlighted the essential role of two-photon absorption in achieving agreement with experimental results.

    Conclusions:

    • The generalized adiabatic frequency conversion method enables efficient and robust ultrashort pulse manipulation in the full nonlinear regime.
    • Accurate modeling requires consideration of two-photon absorption for high-intensity nonlinear dynamics.
    • The developed SHG design offers significant advantages for fundamental and applied research requiring efficient frequency conversion.