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Updated: May 17, 2026

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

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

Published on: May 30, 2014

Blue-pumped whispering gallery optical parametric oscillator.

Christoph Sebastian Werner¹, Tobias Beckmann, Karsten Buse

¹Laboratory for Optical Systems, Department of Microsystems Engineering—IMTEK, University of Freiburg, Georges-Köhler-Allee 102, Freiburg 79110, Germany.

|October 18, 2012

Summary

We developed a compact whispering gallery optical parametric oscillator (OPO) with a low threshold. This device demonstrates tunable visible light generation, paving the way for broader spectral coverage.

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Area of Science:

Optics and Photonics
Nonlinear Optics
Quantum Optics

Background:

Whispering gallery mode resonators offer high optical confinement.
Optical parametric oscillators (OPOs) are crucial for light generation and frequency conversion.

Purpose of the Study:

To demonstrate a millimeter-sized whispering gallery optical parametric oscillator (WG-OPO).
To investigate the tuning capabilities and threshold performance of the WG-OPO.

Main Methods:

Fabrication of a millimeter-sized whispering gallery resonator.
Pumping the resonator with a 488 nm wavelength laser.
Tuning the output signal and idler wavelengths via temperature variation.

Main Results:

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

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Achieved a low pump threshold of 160 μW.
Demonstrated tunability of the signal field from 707 to 865 nm.
Demonstrated tunability of the idler field from 1120 to 1575 nm.
Observed limited conversion efficiency due to pump absorption loss.

Conclusions:

The developed WG-OPO shows potential for covering the entire visible spectrum.
Further optimization could overcome limitations and enhance efficiency.