All-fiber passively mode-locked Tm-doped NOLM-based oscillator operating at 2-μm in both soliton and noisy-pulse regimes

Li, Jianfeng; Zhang, Zuxing; Sun, Zhongyuan; Luo, Hongyu; Liu, Yong; Yan, Zhijun; Mou, Chengbo; Zhang, Lin; Turitsyn, Sergei K.

doi:10.1364/oe.22.007875

Cited by 168 publications

(70 citation statements)

References 26 publications

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“…First demonstrated by Horowitz et al [8], this particular regime of fiber lasers has been drawing attention due to its potential for generating very broad spectra covering hundreds of nanometers [9][10][11], for achieving high energy pulses [7,[12][13][14] and for applications requiring low temporal coherence [8]. NLPs are partially stationary pulses consisting of a bunch of extremely variable ultrashort sub-pulses conserving stable global properties like the total duration of the bunch, its average amplitude, energy and average spectrum.…”

Section: Introductionmentioning

confidence: 99%

High energy noise-like pulsing in a double-clad Er/Yb figure-of-eight fiber laser

et al. 2016

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In this work, we study a 215-m-long figure-of-eight fiber laser including a double-clad erbium-ytterbium fiber and a nonlinear optical loop mirror based on nonlinear polarization evolution. For proper adjustments, self-starting passive mode-locking is obtained. Measurements show that the mode-locked pulses actually are noise-like pulses, by analyzing the autocorrelation, scope traces and the very broad and flat spectrum extending over a record bandwidth of more than 200 nm, beyond the 1750 nm upper wavelength limit of the optical spectrum analyzer. Noise-like pulsing was observed for moderate and high pump power preserving the same behavior, reaching pulse energies as high as 300 nJ, with pulse durations of a few tens of ns and a coherence length in the order of 1 ps. Stable fundamental mode locking as well as harmonic mode locking up to the 6th order were observed. The bandwidth was further extended to more than 450 nm when a 100-m piece of highly nonlinear fiber was inserted at the laser output. The enhanced performances obtained compared to other similar schemes could be related to the absence of a polarizer in the present setup, so that the state of polarization along the cavity is no longer restricted.

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Section: Introductionmentioning

confidence: 99%

High energy noise-like pulsing in a double-clad Er/Yb figure-of-eight fiber laser

et al. 2016

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“…Different from active mode-locking techniques, passive mode-locking is simple, compact and low-cost without using active modulator in the laser cavity. Generally, passively mode-locked thulium-doped fiber lasers (TDFLs) can be implemented by nonlinear polarization rotation (NPR) [3], nonlinear amplifying loop mirror (NALM) [4], nonlinear optical loop mirror (NOLM) [5], semiconductor saturable absorber mirror (SESAM) [6], graphene [7], topological insulator [8], and the combination of saturable absorber (SA) with nonlinear switching based techniques [9]. As carbon allotropes draw much attention recently, single-wall carbon nanotube (SWNT) has been demonstrated to possess ultrafast nonlinear optical responses [10].…”

Section: Introductionmentioning

confidence: 99%

Switchable Dual-Wavelength Mode-Locking of Thulium-Doped Fiber Laser Based on SWNTs

Jiang

et al. 2016

IEEE Photon. Technol. Lett.

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We experimentally demonstrate switchable dual-wavelength mode-locking of thulium-doped fiber laser (TDFL), using single-wall carbon nanotubes (SWNTs) as saturable absorber (SA). Due to the cavity birefringence-induced comb filter, switchable mode-locking can be individually realized for the proposed TDFL among three wavelengths of 1947 nm, 1945 nm, and 1943 nm, with almost the same 3-dB spectral bandwidth of 2.2 nm, repetition rate of 13.6 MHz and pulse-width of 1.8 ps. Furthermore, after finely adjusting the intra-cavity birefringence, we are able to demonstrate switchable dual-wavelength mode-locking at either 1947/1945 nm or 1945/1943 nm. The optical spectra of dual-wavelength mode-locking have almost the same characteristics and can maintain stable operation for a long period.

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“…The most popular include: semiconductor saturable absorber mirrors (SESAMs)8, carbon nanotubes910, graphene1112, topological insulators13, black phosphorus14, and nonlinear optical/amplifying loop mirrors (NOLM/NALM)15. All those mode-locking techniques are well-established and widely used by the laser community.…”

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confidence: 99%

CNT-based saturable absorbers with scalable modulation depth for Thulium-doped fiber lasers operating at 1.9 μm

Soboń

Dużyńska

Świniarski

et al. 2017

Sci Rep

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In this work, we demonstrate a comprehensive study on the nonlinear parameters of carbon nanotube (CNT) saturable absorbers (SA) as a function of the nanotube film thickness. We have fabricated a set of four saturable absorbers with different CNT thickness, ranging from 50 to 200 nm. The CNTs were fabricated via a vacuum filtration technique and deposited on fiber connector end facets. Each SA was characterized in terms of nonlinear transmittance (i.e. optical modulation depth) and tested in a Thulium-doped fiber laser. We show, that increasing the thickness of the CNT layer significantly increases the modulation depth (up to 17.3% with 200 nm thick layer), which strongly influences the central wavelength of the laser, but moderately affects the pulse duration. It means, that choosing the SA with defined CNT thickness might be an efficient method for wavelength-tuning of the laser, without degrading the pulse duration. In our setup, the best performance in terms of bandwidth and pulse duration (8.5 nm and 501 fs, respectively) were obtained with 100 nm thick CNT layer. This is also, to our knowledge, the first demonstration of a fully polarization-maintaining mode-locked Tm-doped laser based on CNT saturable absorber.

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All-fiber passively mode-locked Tm-doped NOLM-based oscillator operating at 2-μm in both soliton and noisy-pulse regimes

Cited by 168 publications

References 26 publications

High energy noise-like pulsing in a double-clad Er/Yb figure-of-eight fiber laser

High energy noise-like pulsing in a double-clad Er/Yb figure-of-eight fiber laser

Switchable Dual-Wavelength Mode-Locking of Thulium-Doped Fiber Laser Based on SWNTs

CNT-based saturable absorbers with scalable modulation depth for Thulium-doped fiber lasers operating at 1.9 μm

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