Samenvatting

Groeblacher Labs, at the TU Delft tries to achieve entanglement using optomechanical resonators like nanobeams. This is done by using the side peaks generated by the optomechanical resonators. These peaks are separated by 5 GHz in relation to the resonance peak of the optomechanical resonator. Because these peaks are of small power compared to the resonance peak of the resonator a filter should be applied to filter out the unwanted peaks. The goal of this project is to develop this filter. The filter is build using two optical cavities, that opperate at the 1556 nm wavelength, of different FSRs (18 GHz and 17 GHz) to have no overlap and to achieve high suppression (-60 dB) of the other peaks. The band- width of the filter is determined by the FWHM, which should be within the range of 50 MHz - 60 MHz. A high efficiency of the whole filter setup is also required. The measured FWHM for both cavities are 33.3 MHz for the 18 GHz cavity and 32.3 MHz for the 17 GHz cavity. The total efficiency of the setup is 65%.