Broadband and high resolution measurements of cavity loss and dispersion

We present a method for broadband measurements of dispersion and loss of an optical cavity. We employ an optical frequency comb directly coupled into a cavity to scan cavity modes and retrieve their shapes and positions. Measurement data are acquired using instrumental-line-shape-free Fourier transform spectrometry. This method can be developed into a powerful tool for optical loss and dispersion measurements concerning broadband characterization of optical elements as well as absorption and dispersion spectroscopy.