16:15 〜 16:45
▲ [21p-C302-3] [INVITED] Ultrafast spatial mode modulation by using chirped pulses of structured light
キーワード：Structured light, Optical vortex, ultrashort pulse
Structured light as optical vortex (OV) and cylindrically polarized beam are used in the various applications, owing to their properties originating in their singularity. However, the technique of precise phase control in the frequency or temporal domain simultaneously with that in the spatial domain has not been fully carried out so far. Here, we demonstrated the ultrafast beam pattern modulation by the superposition of chirped OV pulses with orthogonal spatial modes. The stable and robust modulation with a modulation frequency of sub-THz were carried out by using the precise phase control technique of the constituent pulses in both the spatial and time/frequency domain. Furthermore, we demonstrated a novel vortex Airy beam which is a superposition of an Airy beam and its laterally sheared beam with a π/2 phase shift. This new vortex Airy beam exhibits stable propagation dynamics, wherein its singular point closely follows its main lobe.