Abstract

A stable $Q$-switching pulse train in a ytterbium-doped fiber laser (YDFL) cavity was generated using MAX-polyvinyl alcohol (PVA) thin film, which is composed of layered ternary metal carbide (${{\rm Ti}_3}{{\rm AlC}_2}$) as a passive saturable absorber (SA) and incorporates it in the laser cavity. MAX-PVA SA was fabricated using a solution-casting method. A self-started pulse train with a maximum repetition rate of 92 kHz and a decreasing pulse width (from 3.5 to 1.92 µs) with increasing pump power (from 214 to 260 mW) was produced. The laser’s stability was notable, with a high signal-to-noise ratio of 52 dB obtained at the highest repetition rate of 92 kHz. This finding suggests that MAX-SA could be used as an alternative to other SAs in $Q$-switched fiber lasers.

© 2020 Optical Society of America

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