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.
Divided Pulse Lasers
E. S. Lamb, L. G. Wright, and F. W. Wise. “Divided-Pulse Lasers” Optics Letters, Vol. 39, Issue 9, pp. 2775-2777 (2014).
Diagram of a general divided pulse laser. Pulses are divided before ampification in the gain fiber, then recombined before being output. A saturable absorber mirror (SAM) is used for mode-locking, while a dispersive delay (DD) can provide dispersion.