AMPLIFIER FOR FIBER LASER ENABLED BY STEP-INDEX LARGE MODE AREA FIBER AND ULTRAFAST FIBER LASER COMPRISING THE SAME

摘要

The present invention relates to an optical fiber amplifier using a step index large mode area fiber and an ultra-short pulse fiber laser device including the same, and more particularly, to achieve a high core pump absorption rate and at the same time By using an optical fiber that suppresses photo darkening, maintains excellent beam profile, and facilitates fusion between optical fibers in the ultra-short pulse laser amplification system, the length of the amplified optical fiber is less than 1 m It relates to an optical fiber optical amplifier capable of obtaining sufficient amplification effect while minimizing nonlinear effects in an amplification system by maintaining the