title: Graphene-based Y-branch laser in femtosecond laser written Nd:YAG waveguides.
abstract: We report on Q-switched waveguide lasers on the graphene-based crystalline Y-branch platform. By applying direct femtosecond laser writing of Nd:YAG laser crystal, a surface waveguide splitter with Y-branch geometry has been fabricated with depressed cladding configuration. The Q-switched lasing operation at 1064 nm is achieved in transmission mode, by attaching a two-layer graphene on the resonator output mirror, as well as by using interaction between the evanescent field and a few-layer graphene that was positioned right above the Y-type waveguide. Q-switched laser with a maximum average power of 173 mW, pulse energy and duration of 63 nJ and 90 ns is obtained. This work opens a way for laser-written crystalline devices as compact, direct-pump laser sources for diverse applications.
authors.forename: Hongliang
authors.initials: H
authors.lastname: Liu
authors.forename: Chen
authors.initials: C
authors.lastname: Cheng
authors.forename: Carolina
authors.initials: C
authors.lastname: Romero
authors.forename: Javier R
authors.initials: JR
authors.lastname: Vázquez de Aldana
authors.forename: Feng
authors.initials: F
authors.lastname: Chen