Abstract

High peak power laser pulses using a few meter-long rare-earth elements doped optical fiber are prominently being used in the industrial and commercial areas like medical, remote sensing, and as a booster in communication [1, 2]. This all could be possible due to the unique characteristics of optical fibers such as good spatial beam quality, compactness, stability, and ease of use. The phenomenal growth of pulsed fiber lasers has primarily been driven by ytterbium-doped fiber lasers operating around 1 µm wavelength. Extending these advancements to the 1.5 µm spectral region of ocular safety could open up new possibilities in industry, metrology, and medicine. Also, the use of low nonlinearity large mode area (LMA) fibers at around 1.5 µm in conjunction with a strong mode-locking mechanism can result in the generation of ultrashort pulses with ~ MW peak powers and more than ~ 1 µJ energy [3].

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