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Narrow-band single photons from a single-resonant optical parametric oscillator far below threshold

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4 Author(s)
Scholz, M. ; Nano-Optics Group, Physics Department, Humboldt University, D-10117 Berlin, Germany ; Wolfgramm, F. ; Herzog, U. ; Benson, O.

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We present a single-resonant optical parametric oscillator pumped far below threshold as a source for narrow-band single photons. Spontaneous generation of single photons via parametric downconversion is modified and follows the cavity transfer function. Cross-correlation measurements between signal and idler beams show a cavity bandwidth of 62 MHz. As the main improvement to prior realizations, our cavity is locked to the pump beam via the Hänsch-Couillaud method and therefore allows the continuous generation of heralded single photons with long-term stability.

Published in:

Applied Physics Letters  (Volume:91 ,  Issue: 19 )