Ultrafast mode-locking, the process of generating pulses of light at femtosecond (fs) timescales, is rapidly becoming a widely used tool in the field of photonics. Recently, researchers at the University of California, Berkeley have made a significant breakthrough in this area by demonstrating the first mode-locking generation in an Er-doped fiber laser.

This breakthrough is a major development in ultrafast mode-locking, as it enables the generation of light pulses at unprecedented timescales. The Er-doped fiber laser, which was developed by the UC Berkeley researchers, is capable of producing pulses of light as short as 250 fs. This is significantly faster than the previous record of 500 fs, which was achieved using a different type of laser. The Berkeley team was also able to achieve a pulse repetition rate of up to 50 MHz, which is an improvement over the previous record of 25 MHz.

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source: Phys.org