Single-Pass Squeezing And Spatio-temporal Modes

Luca La Volpe, Laboratoire Kastler Brossel, ENS Paris (link)


My talk concerns a theoretical and experimental analysis of the multimode nature of the squeezed light generated by parametric down-conversion (PDC). The quantum light is generated from the single pass of a femtosecond pump pulse through a non-linear crystal. The absence of a cavity for the quantum light requires a complete theoretical treatment of the PDC Hamiltonian in the spatial and temporal domain and spatio-temporally coupled squeezed modes are found. On the experimental side, a pulse shaper allows for a complete control of the spectral mode of the local oscillator used to characterize the source by homodyne detection. The multimodal distribution of the squeezed light is experimentally demonstrated by shaping the local oscillator in different spectral and spatial modes.


GAP, Département de physique Appliquée
22 ch. de Pinchat, 1227 Carouge
Seminar room 3