Graphene Based Passively Q-Switched Nd:YAG Eye-Safe Laser

Abstract

A passively Q-switched Nd YAG eye-safe laser operating at 1444 nm with graphene as a saturable absorber is reported. Under a pump power of 23.7 W, the maximum average output power, minimum pulse width, pulse repetition rate and single pulse energy are 411 mW, 560 ns, 85 kHz, and 4.83 𝜇J, respectively. This is the first demonstration of a Nd:YAG eye-safe laser passively Q-switched by graphene.

Gold nanorods as a saturable absorber for passively Q-switching Nd:YAG lasers at 1064.3 and 1112 nm

“…Graphene and MoS 2 have a broadband absorption spectrum due to the unique zero band gap structure [11][12][13][14]. Based on graphene and MoS 2 as an SA, near-infrared passively Q-switched lasers have been experimentally demonstrated [15,16].…”

1357 nm passively Q-switched crystalline ceramic laser based on multilayer graphene

“…Compared with neodymium-doped yttrium aluminum garnet (Nd:YAG) single crystals, Nd:YAG ceramic has higher neodymium concentration with no decrease in optical quality, better mechanical properties, larger size, and lower cost [20,21]. Moreover, it also has been proved to be a promising mat erial for 1.3 μm solid state lasers.…”

Heteroclinic Bifurcation Analysis of Duffing-Van Der Pol System by the Hyperbolic Lindstedt-Poincaré Method

“…Therefore, many efforts have been made to study heteroclinic bifurcations and solutions of self-excited systems. For instance, Vakakis [5] studied the splitting of the stable and unstable manifolds of Duffing oscillator; Xu et al [6] presented a perturbation-incremental method to semi-analytically calculate the separatrices and the limit cycles of strongly nonlinear oscillators; Chan et al [7] used the perturbation-incremental method to study the stability and the bifurcations of limit cycles; Mikhlin and Manucharyan [8] used their method to derive heteroclinic trajectories of mechanical systems with several equilibrium positions; Zhang et al [9] applied the undetermined fundamental frequency method to predict the heteroclinic bifurcation of strongly nonlinear oscillator; Izydorek and Janczewska [10] studied the existence of heteroclinic solutions for second-order Hamiltonian systems. Cao et al [11] developed a modification of the perturbation-incremental method to accurately approximate homoclinic and heteroclinic orbits of certain nonlinear oscillators.…”