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We present an efficient and robust source of photons at the $^{87}$Rb D1-line(795 nm) with a narrow bandwidth of $\delta=226(1)$ MHz. The source is based onnon-degenerate, cavity-enhanced spontaneous parametric down-conversion in amonolithic optical parametric oscillator far below threshold. The setup allowsfor efficient coupling to single mode fibers. A heralding efficiency of$\eta_{\mathrm{heralded}}=45(5)$ % is achieved, and the uncorrected number ofdetected photon pairs is $3.8 \times 10^{3}/(\textrm{s mW})$. For pairgeneration rates up to $5\times 10^{5}/$s, the source emits heralded singlephotons with a normalized, heralded, second-order correlation function$g^{(2)}_{c}<0.01$. The source is intrinsically stable due to the monolithicconfiguration. Frequency drifts are on the order of $\delta/20$ per hourwithout active feedback on the emission frequency. We achieved fine-tuning ofthe source frequency within a range of $ > 2$ GHz by applying mechanicalstrain.

An efficient, tunable, and robust source of narrow-band photon pairs at the $^{87}$Rb D1 line