Description
Acousto-optical modulators are ubiquitously equipped in modern research labs across fields for modulation of amplitude, phase, frequency and propagation direction of light. Efficient AOM diffraction relies on phase-matching the light beams with the sound wave. Deviation of operation parameters from the pre-aligned Bragg condition leads to reduced diffraction efficiency and distorted diffraction phase, severely limiting the tuning range and control bandwidth in traditional AOM applications. Inspired by coherent control techniques for atom interferometry, we propose a new class of AOM techniques, by splitting a single Bragg-diffraction into an N-AOM process, for efficient diffraction beyond the Bragg condition and rapid modulation with close-to-unity efficiency. In a simplest 2-AOM example, we demonstrate rapid routing of a mode-locked laser output into two paths with >90% efficiency and 15∼20dB side pulse suppression. We further demonstrate coherent stacking of successive pulses for 1/4 repetition rate prescaling with nearly two-fold enhancement of peak power. With the unprecedented acoustic optical modulation efficiency and bandwidth combination, we expect the composite AOM technique to help paving a practical pathway toward arbitrary modulation of mode-locked lasers with up to GHz repetition rate.
| Presenter name | Ruijuan Liu |
|---|---|
| online poster URL | https://webplus.fudan.edu.cn/_s854/wonference/list.psp |
| How will you attend ICAP-27? | I am planning on virtual registration for online attendance |
