Optical fiber systems for delivering short high power pulses

摘要

Described is an optical fiber system for delivering ultrashort pulses with minimal distortions due to nonlinearity. The system is based on delivering the optical pulses in a higher order mode (HOM) of a few-moded fiber. The fiber is designed so that the dispersion for the HOM is very large. This results in a dispersion length LD for the delivery fiber that is exceptionally small, preferably less than the non-linear length LNL. Under these conditions the system may be designed so the optical pulses experience minimum non-linear impairment, and short pulse/high peak power levels are reproduced at the output of the delivery fiber.

主权项

1. A method for generating short high power optical pulses, said method comprising:
(a) generating optical laser pulses, (b) propagating the optical laser pulses through a pulse stretcher; (c) converting the propagating mode of the optical laser pulses to one particular higher order mode, (d) propagating the optical laser pulses in the one particular higher order mode along a length L of higher order mode optical fiber to an output, wherein the higher order mode optical fiber exhibits a characteristic dispersion length LD, a characteristic nonlinear length LNL, a negative dispersion D and an effective area Aeff at the one particular higher order mode such that LD is less than LNL so that short high power optical laser pulses are generated at the one particular higher order mode.