Abstract
In our work, based on chemical vapor deposition method and a newly designed glass–material–glass sandwich structure, MoS2 saturable absorber (SA) with a damage threshold of higher than 0.26 J/cm2 was fabricated and employed for demonstrating high-power, large-energy rectangular mode-locked Er-doped laser operation. Stable mode-locked operation with maximum output power of 122.77 mW and largest pulse energy of 130.49 nJ were successively achieved along with power scaling process. In comparison with previous works, our results show remarkable breakthroughs both in the aspects of average output power and pulse energy. Our experimental design and results will open a new avenue for generating high-power, large-energy mode-locked fiber lasers based on two-dimensional materials as SAs.
Highlights
Two dimensional (2D) materials based ultra-fast optical modulators, exhibiting the properties of wide absorption band, ultra-fast recovery time, high damage threshold, low cost and easy preparation, have extensively promoted the advancement of ultra-fast mode-locked fiber lasers both in scientific and industrial applications [1]–[26]
To the best of our knowledge, such high average power and pulse energy exhibit subversive enhancement in comparison with other reported results, which provides a significant reference for demonstrating high average power, large energy mode-locked fiber lasers based on 2D materials as saturable absorber (SA)
Preparing SA with high damage threshold has decisive effect in demonstrating high-power and large-energy pulsed operations, in our work, we demonstrated a novel method for the isolation of the oxygen and the materials, which will exhibit significance in the improvement of the damage threshold of the materials
Summary
Two dimensional (2D) materials based ultra-fast optical modulators, exhibiting the properties of wide absorption band, ultra-fast recovery time, high damage threshold, low cost and easy preparation, have extensively promoted the advancement of ultra-fast mode-locked fiber lasers both in scientific and industrial applications [1]–[26]. Long-length laser cavity and excellent saturable absorption material with high damage threshold are the determinants for demonstrating high-power large-energy modelocked fiber laser operations. Among the widely investigated 2D materials, since its firstly successful optical absorption properties and ultra-fast application reported in 2014 [16], MoS2 have been utilized extensively for demonstrating a number of ultra-fast laser operations arranged from visible to mid-infrared due to its obvious advantages of wide absorption band, suitable bandgap value, ultra-fast recovery time and high damage threshold [17]–[19]. To the best of our knowledge, such high average power and pulse energy exhibit subversive enhancement in comparison with other reported results, which provides a significant reference for demonstrating high average power, large energy mode-locked fiber lasers based on 2D materials as SAs
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