Graphene oxide saturable absorber for a 1.03 μm passively Q-switched single crystal fiber pulsed laser

In this work, the graphene oxide (GO) samples of different oxidation degree prepared by modified Hummers method were drop-coated on sapphire substrates as saturable absorber (SA). On this basis, this work innovatively combines GO, the excellent SA, with single crystal fiber (SCF), the outstanding laser gain medium, for the first time to achieve 1.03 mu m passively Q-switched pulsed laser output with the maximum average power of 2.183 W and the repetition frequency of 317.42 kHz, which is, to our knowledge, the largest average power of passively Q-switched SCF pulsed laser output reported so far.

Automated summary

In this study, graphene oxide (GO) samples with different oxidation degrees were drop-coated onto sapphire substrates as the saturable absorber (SA). Based on this, GO, an excellent SA, is innovatively combined with single crystal fiber (SCF), an outstanding laser gain medium, to achieve 1.03 μm passively Q-switched pulsed laser output with a maximum average power of 2.183 W and a repetition frequency of 317.42 kHz. This is, to our knowledge, the largest average power of passively Q-switched SCF pulsed laser output reported so far.