Abstract
A cell-type saturable absorber has been demonstrated by filling the single mode photonic crystal fiber (SMPCF) with tungsten disulfide (WS2) nanosheets. The modulation depth, saturable intensity, and non-saturable loss of this SA are measured to be 3.53%, 159 MW/cm2 and 23.2%, respectively. Based on this SA, a passively mode-locked EDF laser has been achieved with pulse duration of 808 fs and repetition rate of 19.57 MHz, and signal-noise-ratio (SNR) of 60.5 dB. Our results demonstrate that the cell-type WS2 nanosheets SA can serve as a good candidate for short-pulse mode locker.
Highlights
A cell-type saturable absorber has been demonstrated by filling the single mode photonic crystal fiber (SMPCF) with tungsten disulfide (WS2) nanosheets
Because that the light directly pass through the polymeric film with low softening point, the damage threshold is relatively low for the polymeric saturable absorber (SA)
PCF-based SA can overcome the above problems in microfiber- or SPF-based SAs, this type of SA device has the following problems: 1) Relatively larger insertion loss (IL), which might arise from the lower splicing efficiency between SMF and PCF, from the PCF segment filled with nanomaterials
Summary
A cell-type saturable absorber has been demonstrated by filling the single mode photonic crystal fiber (SMPCF) with tungsten disulfide (WS2) nanosheets. Photonic crystal fiber (PCF)[52] can play as an optical platform by filling the air channels with various nanomaterials to form functional devices for mode-locking[53,54,55,56]. B. Liu first reported a nanosecond-pulse erbium-doped fiber (EDF) laser that was passively mode locked by a hollow-core PCF filled with few-layered graphene oxide solution.
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