In this master's thesis we study two filtering techniques, first the Faraday anomalous dispersion optical filter (FADOF) and second a monolithic Fabry-Pérot interferometer with the aim of filtering down-converted photon pairs resonant with the D1 line of 87Rb. The geometrical properties of a plano-convex lens with a high- refectivity dielectric coating applied on both sides provides us with a long term stability and a tunable Fabry-Pérot cavity suitable for narrowband frequency filtering. A transmission of 30% is reached, a free spectral range of 19.2 GHz and a bandwidth of 47.5 MHz are measured providing a proof-of-concept for a future implementation. In addition, a 852 nm DFB laser is mounted and tested by performing saturated absorption spectroscopy with the aim of locking the laser. However, the results show that the laser was mode hopping.
En col·laboració amb la Universitat Autònoma de Barcelona (UAB) i la Universitat de Barcelona (UB)
