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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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Bragg-grating-enhanced narrowband spontaneous parametric downconversion.

Li Yan1, Lijun Ma, Xiao Tang

  • 1Department of Computer Science and Electrical Engineering, University of Maryland Baltimore County,Baltimore, Maryland 21250, USA. liyan@umbc.edu

Optics Express
|April 15, 2010
PubMed
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We developed a new method using Bragg gratings in nonlinear optical waveguides to narrow the line width of entangled photons from spontaneous parametric downconversion (SPDC). This approach shows promise for generating narrow-line entangled photons for quantum applications.

Area of Science:

  • Quantum optics
  • Photonics
  • Nonlinear optics

Background:

  • Spontaneous parametric down-conversion (SPDC) is a key source of entangled photons.
  • Narrowing the spectral line width of entangled photons is crucial for many quantum technologies.
  • Existing methods for spectral control in SPDC can be complex or limited.

Purpose of the Study:

  • To propose and theoretically investigate a novel method for narrowing the spectral line width of entangled photons.
  • To explore the use of integrated Bragg gratings within nonlinear optical waveguides for spectral control.
  • To assess the feasibility of generating sub-GHz entangled photons using this integrated approach.

Main Methods:

  • Theoretical study of spectral characteristics of SPDC.

Related Experiment Videos

Last Updated: Jun 13, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
10:17

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

  • Modeling of nonlinear optical waveguides incorporating internal Bragg gratings.
  • Simulation of two distinct Bragg grating structures, including one with a midway pi-phase shifter.

    • Main Results:

    • Demonstrated that integrated Bragg gratings can effectively narrow the spectral line width of SPDC photons.
    • Identified a specific Bragg grating structure with a midway pi-phase shifter as particularly effective.
    • Achieved theoretical predictions for generating narrow-line entangled photons in the GHz to sub-GHz range.

    Conclusions:

    • The proposed method offers a promising route to generating narrow-line entangled photons.
    • Integrated photonic devices with Bragg gratings provide a viable platform for spectral control in SPDC.
    • This technique has potential applications in quantum communication and quantum information processing.