Controlling the carrier-envelope phase of few-cycle focused laser beams with a dispersive beam expander.
We report on a procedure to focalize few-cycle laser pulses in dispersive media with controlled waveform. Stationarity of the carrier-envelope phase for extended depth of focus is attained by shaping the spatial dispersion of the ultrashort beam. An adjustable group velocity is locally tuned in order to match a prescribed phase velocity at focus. A hybrid diffractive-refractive lens system is proposed to drive the wavefield to an immersion microscope objective under convenient broadband modulation. Numerical simulations demonstrate robustness over positioning of this dispersive beam expander.
Zapata-Rodríguez
Carlos J
CJ
Departamento de Optica, Universidad de Valencia, 46100 Burjassot, Spain. carlos.zapata@uv.es
Porras
Miguel A
MA