Microfiber-based WS 2 -film saturable absorber for ultra-fast photonics
Microfiber-based WS 2 -film saturable absorber for ultra-fast photonics
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DOI：
10.1364/ome.5.000479
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发表时间：
2015-03
影响因子：
2.8
通讯作者：
P. Yan;A. Liu;Yushan Chen;Hao Chen;S. Ruan;C. Guo;Sifan Chen;I. Li;Haipeng Yang;Juguang Hu-J
中科院分区：
文献类型：
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作者：
P. Yan;A. Liu;Yushan Chen;Hao Chen;S. Ruan;C. Guo;Sifan Chen;I. Li;Haipeng Yang;Juguang Hu-J
利用脉冲激光沉积(PLD)方法制备了二硫化钨(WS2)薄膜SA，实现了被动锁模掺铒光纤(EDF)激光器。WS2薄膜与厚度有关，有两种不同的状态：大块的WS2[面对等离子体羽流]和微小的WS2薄片[在等离子体羽流的阴影下]。这种SA器件表现出低插入损耗(IL)和高功率耐受能力。有趣的是，SA器件具有与薄膜状态相关的不同的非线性吸收机制。在泵浦功率为54 mW时，获得了稳定的基模锁定(FML)，脉冲宽度为675 ps，信噪比(SNR)为65 d B。在最大泵浦功率为395 mW时，获得了高达1 GHz的谐波锁模(HML)重复率，脉冲宽度为452ps，信噪比为48dB。实验结果表明，WS2-PLD薄膜可以作为超快激光系统的一种有前途的SA。
In this paper, we demonstrated a passively mode-locked erbium-doped fiber (EDF) laser by incorporating a tungsten disulfide (WS2) film SA fabricated by pulsed laser deposition (PLD) method. The WS2 film was thickness-dependent, which had two different states: the bulk WS2 [faced to plasma plume] and tiny WS2 flakes [in the shadow of plasma plume]. This SA device demonstrated low insertion loss (IL) and high power tolerance ability. Interestingly, the SA device possessed different nonlinear absorption regimes related with the film states. By employing this new type of SA, we obtained stable fundamental mode-locking (FML) at pump power of 54 mW, and the generated soliton pulse had pulse duration of 675 fs and signal-to-noise ratio (SNR) of 65 dB. At the maximum pump power of 395 mW, we also obtained up to 1 GHz repetition rate of harmonic mode-locking (HML) with pulse duration of 452 fs and SNR of 48 dB. The experimental results show that WS2-PLD film can serve as a promising SA for ultrafast laser systems.