Dual-parameter femtosecond mode-locking pulse generation in partially shared all-polarization-maintaining fiber Y-shaped oscillator with a single saturable absorber
Chen BaiYe FengWeiguang ZhangJunying ZhangTong ZhangChao MeiPandi LiuZhaojin FanJiangxiao QianJia Yu
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Saturable absorption
Bistability
Mode-Locking
We report passive mode locking of a soliton erbium-doped fiber laser based on graphene saturable absorber at repetition rate continuously scalable up to 500 MHz. The supermodes are suppressed by 50 dB at 32nd harmonic.
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Manganese oxide nanosheets (MnO 2 NSs) with two-dimensional formation and typically ultrathin thickness have gained a great deal of attention due to their excellent physical and chemical properties. However, the potential capability of MnO 2 NSs in laser application has been rarely explored. Here, we first report the MnO 2 NSs as the saturable absorber (SA) for generating Q-switched pulsed laser. The MnO 2 NSs–based SA not only shows a broadband absorption, but also possesses nonlinear saturable absorption feature. By integrating the MnO 2 NSs-SA into an erbium-doped fiber laser cavity, a stable passively Q-switched operation at central wavelength of ∼1558 nm was realized with a threshold pump power of 220 mW, and 1.26 μs pulse width with a repetition rate of 92.35 kHz was obtained. Our results indicate that the MnO 2 NSs can serve as promising candidates for constructing optical pulsed lasers.
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We demonstrate a passively Q-switched erbium-doped fiber laser (EDFL) based on graphene as a saturable absorber (SA). Two fiber Bragg gratings (FBGs) are used as the end mirrors in an all-fiber linear cavity. The Q-switched EDFL has a pump threshold of 68.2 mW. The minimum pulse duration is 0.85 μs and the highest pulse energy is 40.9 nJ. The pulse repetition rate of the fiber laser can be widely changed from 51.1 to 118.1 kHz by increasing the pump power from 68.2 to 400 mW.
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Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Z. Sun, A. G. Rozhin, F. Wang, W. I. Milne, R. V. Penty, I. H. White, and A. C. Ferrari, "Ultrafast Erbium-doped Fiber Laser Mode-locked by a Carbon Nanotube Saturable Absorber," in Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, OSA Technical Digest (CD) (Optica Publishing Group, 2009), paper CML5. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article
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Abstract Passively Q-switched erbium-doped fiber laser (EDFL) have been demonstrated using graphene oxide (GO) film as saturable absorber (SA). The aim of this experiment is to generate and demonstrate passively Q-Switched Erbium-doped fiber laser (EDFL) using GO as a saturable absorber. Stable Q-switched operation can be achieved at 1558.8 nm. By increasing the pump power from 26.32mW to 71.65mW, the repetition rate also increased from 30.58 kHz to 51.81k Hz. The pulse width of the laser were 11.2 – 4.73 µs. The maximum output power and maximum peak power obtained are 128 µW and 521.98 µW respectively at a pump power of 71.65 mW. The pulse energy reaches 2.47nJ. These results show that GO is a new potential SA material for pulsed laser applications.
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In this Letter, we demonstrate an all-polarization-maintaining, stretched-pulse Tm-doped fiber laser generating ∼200 fs pulses centered at 1945 nm. As a saturable absorber, a graphene/poly(methyl methacrylate) composite was used. To the best of our knowledge, this is the first demonstration of stretched-pulse operation of a graphene-based fiber laser at 2 μm.
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We demonstrated a mode-locked erbium-doped fiber laser based on ferroferric-oxide (Fe3O4) nanoparticles as a saturable absorber. A stable 2.93 ps mode-locked pulse was obtained at 1572.39 nm in such a laser.
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Mechanically exfoliated graphene saturable absorber based all-polarization maintaining passively mode-locked erbium doped fiber laser is presented. The laser consists of fully polarization maintaining (PM) fibers and components, providing linear output polarization state. The saturable absorber was formed by mechanical exfoliation of graphene flakes from pure graphite and deposited on a fiber connector. It was characterized using atomic force microscopy and Raman spectroscopy. Laser resonators with repetition frequency of 45.88 MHz and 114.1 MHz were investigated. The soliton pulses at 1555 nm were achieved with duration around 600 fs. The splicing procedure of PM-fibers was also optimized which results in improvement of degree of polarization (DOP).
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Abstract In this paper, passively Q-switched fiber laser is demonstrated and the laser output energy is stabilized by using 2.4 m Erbium-doped fiber laser (EDFL) with a graphene oxide used as saturable absorber (GO-SA). According to the experimental results in the Q-switched configuration, the laser cavity emits a wavelength centered at 1,558.75 nm, and by inserting the GO-SA into EDFL cavity, hence, the laser output energy around 1.68 nJ with an FWHM pulse width of 2.3 µs at 123.5 kHz was achieved.
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Passively mode-locked fiber lasers [1-6] are a unique source of solitons for telecommunications. Ultra-short pulse generation in laser systems is based on a variety of schemes including figure of eight fiber laser design [1], fast saturable absorber [3], coupled cavity [5], additive pulse mode-locking [6] and nonlinear polarization rotation [7,8]. The use of a semiconductor mirror-saturable absorber has been suggested for a passively mode-locked soliton laser [9] and its experimental verification has been reported in [10].
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