Our Research
Our group’s research is focused on two main themes which are inextricably connected. Our primary objective is to investigate, using numerical simulations, the physics of the interplay between turbulence and internal gravity waves in both mid-water and near the bottom/top and lateral boundaries of the ocean and lakes. read more…
Ultrafast fiber lasers based on self-similar pulse evolution: a review of current progress
Ultrafast fiber lasers based on self-similar pulse evolution: a review of current progress
We summarize the state of research on lasers based on self-similar pulse evolutions, including passive similariton, amplifier similariton, and others. Self-similar fiber lasers are conceptually different from other kinds of short-pulse lasers. This distinction allows for exciting new laser design options.
Characteristic steady-state round trip evolutions of the pulse chirp for different mode-locking regimes. Solid lines indicate the chirp of the pulse, while dashed lines indicate the local dispersion of the cavity. In the highlighted plot, the lines show the difference of the pulse from a parabolic pulse.
Ultrabroadband Dispersive Radiation by Spatiotemporal Oscillation of Multimode Waves
Ultrabroadband Dispersive Radiation by Spatiotemporal Oscillation of Multimode Waves
We show that intense pulses in multimode fiber oscillate in space and time, and that this creates resonant radiation across the electromagnetic spectrum. This work provides a route to tunable sources of ultrashort pulses from IR to ultraviolet and beyond. Dreaming, this work could lead to a fiber-format alternative to the free-electron laser.
The resonant dispersive radiation is diffracted off a grating onto a piece of white paper.
Divided Pulse Lasers
We show that divided-pulse amplification can be used within a laser cavity to increase the pulse energy of a soliton fiber laser. In divided-pulse amplification, pulses are split up N times prior to amplification. After amplification, they are recombined into a single pulse. By reducing the peak intensity within the gain fiber, each split copy can be amplified to the single-pulse limit, and therefore the final recombined pulse can have N times higher energy. This work was featured in Spotlight on Optics.
