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A miniature ultrabright source of temporally long, narrowband biphotons
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental setup. The biphoton source is composed of a periodically poled KTP crystal with spherically polished and coated end faces S1 and S2. So that the pump is double passed, the end face S2 is also coated at the 532 nm pump wavelength. Orthogonally polarized signal and idler photons are separated by a polarizing beam splitter (PBS) before detection by single-photon detection modules, SPDM1 and SPDM2. Long-pass and band-pass filters (F) are used to remove the pump and spurious fluorescence. Lens L1 and L2 are used to focus the pump into the crystal and to collimate the signal and idler beams.

Image of FIG. 2.
FIG. 2.

Cluster spacing and gain linewidth. The top panel illustrates the signal and idler modes (shown in black color) increasing in opposite directions. The signal and idler resonances that line up vertically (red) are resonant at both the signal and the idler wavelengths. The bottom panel shows the calculated gain curve for SPDC with a double-pass pump (solid curve) and with a single-pass pump (dashed curve). The central cluster frequency (red vertical line) is taken as the center frequency of the gain curve . Single-mode output is achieved when there is only one doubly resonant mode under the gain curve.

Image of FIG. 3.
FIG. 3.

Glauber correlation function of the signal and idler photons. The coincidence counts (black) are measured as a function of the time delay between the signal and idler photons at a pump power of 700  . The red curve (theoretical) is a fit using two exponential decays with decay constants of and  ns for greater than or less than zero. The full width at half maximum, or the correlation time, is .


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Scitation: A miniature ultrabright source of temporally long, narrowband biphotons