Presentation Information
[17a-WL2_101-3]Formulation of the far-field diffraction of ultrashort light pulses by a multilevel phase grating
〇Jun Amako1 (1.TCU)
Keywords:
multilevel phase grating,ultrashort light pulse,diffraction efficiency
Diffraction gratings are widely used as a means of spatio-temporal control of ultrashort light pulses. Aside from time-consuming rigorous computations, an easy-to-use analytical tool capable of handling diffracted ultrashort light pulses from a grating can be proven to be useful. Under a scalar approximation, we derived a set of closed-form equations to calculate temporal fields and energies of ultrashort light pulses diffracted into multiple orders by a multilevel phase grating. Using the equations, we analyzed far-field diffractions of femtosecond Gaussian pulses by blazed multilevel gratings to find that with shortening the initial pulse duration, the blazed-order diffraction efficiency decreases, whereas the efficiencies of other orders increase. Our formulation allows for intuitive analyses of ultrashort pulse diffractions by thin surface-relief gratings, such as pulse shaping and pulse energy delivery, whether those gratings are transmissive or reflective,