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 pulsed optical fiber laser device including the same, and more particularly, to achieve a high core pump absorption rate and at the same time By using optical fibers that suppress photo darkening, maintain excellent beam profile, and facilitate fusion between optical fibers in an ultra-short pulse laser amplification system, the length of the amplified optical fiber is less than 1 m. The present invention relates to an optical fiber amplifier capable of obtaining sufficient amplification effect while minimizing the nonlinear effect in the amplification system by maintaining it, and an ultrashort pulsed fiber laser device including the same.