title: Dynamic ultrafast laser spatial tailoring for parallel micromachining of photonic devices in transparent materials.
abstract: Femtosecond laser processing of bulk transparent materials can generate localized positive changes of the refractive index. Thus, by translation of the laser spot, light-guiding structures are achievable in three dimensions. Increasing the number of laser processing spots can consequently reduce the machining effort. In this paper, we report on a procedure of dynamic ultrafast laser beam spatial tailoring for parallel photoinscription of photonic functions. Multispot operation is achieved by spatially modulating the wavefront of the beam with a time-evolutive periodical binary phase mask. The parallel longitudinal writing of multiple waveguides is demonstrated in fused silica. Using this technique, light dividers in three dimensions and wavelength-division demultiplexing (WDD) devices relying on evanescent wave coupling are demonstrated.
authors.affiliation: Laboratoire Hubert Curien, UMR 5516 CNRS, Université Jean Monnet, 42000 Saint Etienne, France.
authors.forename: C
authors.initials: C
authors.lastname: Mauclair
authors.forename: G
authors.initials: G
authors.lastname: Cheng
authors.forename: N
authors.initials: N
authors.lastname: Huot
authors.forename: E
authors.initials: E
authors.lastname: Audouard
authors.forename: A
authors.initials: A
authors.lastname: Rosenfeld
authors.forename: I V
authors.initials: IV
authors.lastname: Hertel
authors.forename: R
authors.initials: R
authors.lastname: Stoian