Generation of pulse trains with nonconventional temporal correlation properties

Abstract

We apply time dependent spectral phase modulation to generate pulse trains that are spectrally and temporally partially coherent in an ensemble averaged sense. We consider, in particular, quadratic spectral phase modulation of Gaussian pulses, and demonstrate two particular types of nonuniformly correlated pulse trains. The controlled partial temporal coherence of the nonstationary fields is generated using a pulse compressor and experimentally verified with frequency resolved optical gating (FROG). We show that the correlation characteristics of such pulse trains can be retrieved directly from the FROG spectrograms provided one has certain a priori knowledge of the pulse train. Our results open a pathway for experimental confirmation of several correlation induced effects in the temporal domain.

Partially coherent sources whose coherent modes are spatiotemporal optical vortex beams

“…The incoherent sum is realized by generating the coherent modes in succession or on independent pulses, which are then integrated by the detector. This approach is similar to that described in [68,69]. The initial pulsed laser source (the input into the FTPS) should have a coherence time that is longer than the pulse duration, but shorter than the pulse repetition time.…”

Propagation Properties of Generalized Schell-Model Pulse Sources in Dispersive Media

“…In addition, the behaviors of twisted space-time partially coherent beams and spatiotemporal vortex pulses carrying an orbital angular momentum were explored both experimentally and theoretically [28][29][30][31][32][33], which provides guidance on applications related to sculpturing spatiotemporal wave packets and spatiotemporal spin-orbit angular momentum coupling. Recently, spectral phase-modulated pulses trains and phasestructured complex temporal degree of coherence pulse sources were introduced [34][35][36], which show the nontrivial phase function can be used to control the distribution of the average arrival time of the pulse train. These inspire us to explore the theoretical model of the random pulse with the temporal coherence being the function of the n-th power difference of two instants.…”