October 12, 2020

Now Available. CS-TC03: Single-Mode, Narrow Band Photon Source Using SPDC for Hybrid Quantum Systems

Researchers at the University of Vienna have designed a photon source using Spontaneous Parametric Down-Conversion (SPDC) with a doubly resonant Optical Parametric Oscillator (OPO) utilizing an additional birefringent crystal to tune clusters independent of SPDC phase-matching. Achieving the doubly resonant condition in the OPO that enables a single mode is challenging. This photon source has a bandwidth of 10.9 MHz to match the linewidths of atomic transitions. The source also produces single-mode photon pairs at a rate of 47.5 Hz without mode filters reducing loss in the system, which enables research and applications in the quantum realm using hybrid light-matter interactions.

The Optical Parametric Oscillator (OPO) is highly dependent on the temperature of the crystal, which can alter the index of refraction and change the wavelength of the light or change length due to temperature, causing a shift in efficiency and cluster tuning capabilities. Temperature regulation of both crystals in the OPO cavity is essential. The PTC5K-CH controlled the temperature of the crystals in the OPO cavity with precision better than 2 mK, generating the necessary crystal stability.

The complete case study is available as CS-TC03.


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