ULTRA HIGH POWER SINGLE MODE FIBER LASER SYSTEM WITH NON-UNIFORMLY CONFIGURED FIBER-TO-FIBER ROD MULTIMODE AMPLIFIER

摘要

And a laser head including a booster composed of an optical fiber amplifier extending into a free space, a pump source, and a refractive element that receives the pump light and reflects it toward the output end of the booster in the opposite direction of signal propagation. The booster consists of a concentric, multi-mode ("MM") core formed in a conical shape extending to the same width and a cladding surrounding the core. The core comprises a mode transition region that extends between the small diameter SM input and the large diameter MM output core, and is configured so that amplification of the higher order mode is substantially suppressed as single-mode ("SM") signal light propagates from the input to the output core end. do. The laser head accommodates each pump light transmission cable and the output end of the Xinhua fiber. The pump source consists of a plurality of distinct sub-pumps arranged around the booster. The laser head supports a segment mirror configured to reflect the pump light from each pump sub-sources in the opposite direction to the output end of the booster, and the booster emits an amplified optical signal that substantially reaches the MM output level in SM. It is configured to.