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Related Experiment Video

Updated: Jun 17, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Continuous-wave optical parametric terahertz source.

Rosita Sowade1, Ingo Breunig, Iván Cámara Mayorga

  • 1Institute of Physics, University of Bonn, Wegelerstr. 8, D-53115 Bonn, Germany.

Optics Express
|January 7, 2010
PubMed
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Electro-optically tunable single-frequency lasing from neodymium-doped lithium niobate microresonators.

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We developed a novel, uncooled terahertz light source using cascaded nonlinear optical processes. This continuous-wave system generates a tunable, diffraction-limited terahertz beam with high output power.

Area of Science:

  • Photonics
  • Nonlinear Optics
  • Terahertz Science

Background:

  • Terahertz (THz) light sources are crucial for various applications, but often require cryogenic cooling, limiting their practicality.
  • Existing methods like difference frequency generation struggle with low output power.

Purpose of the Study:

  • To present a novel, continuous-wave (CW) optical parametric terahertz (THz) light source that operates without cooling.
  • To achieve tunable THz generation with high output power and a diffraction-limited beam.

Main Methods:

  • Utilizing simultaneous phase matching of two nonlinear processes within a single periodically-poled lithium niobate (PPLN) crystal.
  • Employing an optical resonator to enhance the signal wave of a primary parametric process, enabling a secondary nonlinear process.

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Last Updated: Jun 17, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

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

  • Generating a backward-traveling THz wave via cascaded nonlinear processes.

    • Main Results:

    • The developed source operates continuously without cooling, emitting a diffraction-limited THz beam.
    • The THz output is tunable from 1.3 to 1.7 THz, with power levels exceeding 1 microwatt (µW).
    • The cascaded process scheme significantly boosts THz output power (over an order of magnitude) compared to non-resonant difference frequency generation.

    Conclusions:

    • The presented optical parametric THz source offers a practical, high-power, and tunable solution for THz generation.
    • The use of cascaded nonlinear processes in an optical resonator is an effective strategy for enhancing THz output power.
    • This uncooled THz source opens new possibilities for THz spectroscopy, imaging, and sensing applications.