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

摘要

It includes a booster composed of an optical fiber amplifier extending into free space, a pump source, and a laser head including a refracting element that receives the pump light and reflects it toward an output end of the booster in a direction opposite to signal propagation. The booster consists of a concentric, conical multimode ("MM") core and a cladding surrounding the core. The core includes a mode transition region extending between the small-diameter SM input and the large-diameter MM output core, and is configured to substantially suppress amplification of higher-order modes as the single mode ("SM") signal propagates from the input to the output core end. do. The laser head receives each pump light transmission cable and an output end of the Xinhua optical fiber, respectively. The pump source consists of a plurality of separate sub-pumps arranged around the booster. The laser head supports a segment mirror configured to reflect the pump light from each of the pump subsources to the output end of the booster in the direction opposite to the radio wave, and the booster emits an amplified optical signal that substantially reaches the MM output level with SM. Is configured to