Abstract
Ultrafast frequency combs (FC) have found tremendous utility as precision instruments in various domains ranging from metrology, spectroscopy, and optical timekeeping [1]. The noise dynamics of FC are typically described with a succinct number of collective properties, such as the pulse energy, carrier envelope offset (CEO), or the temporal jitter of the pulse train. Haus et al. theorized that a variation in one of these parameters perturbs the FC in a manner that consists of adding a particular noise mode to the coherent field structure [2]. Thus, the entirety of the FC noise dynamics should be described by a set of noise modes in which each mode possesses a particular pulse shape. The existence of such modes would imply a non-negligible role of spectral noise correlations among the individual FC teeth. This work provides an experimental realization of such uncoupled, broadband noise modes by utilizing ultrafast pulse shaping combined with quantum noise-limited balanced homodyne detection to identify spectral correlations of both the amplitude and phase noise in a FC.
© 2015 IEEE
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