Kilowatt Peak Power Pulses From a Passively Q-Switched Yb-Doped Fiber Laser With a Smaller-Core Yb-Doped Fiber as a Saturable Absorber

Lu, Yi; Gu, Xiaodong

doi:10.1109/jphot.2014.2320745

Cited by 18 publications

(7 citation statements)

References 15 publications

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“…The mechanism of Q-switching using the same Yb-doped gain fibers of different core diameters is described in ref. [102,103]. In this laser the Yb-doped fibers of a 20 and 10 μm diameter cores are used as the gain fiber and SA fiber respectively.…”

Section: Resultsmentioning

confidence: 99%

All-fiber passively mode-locked femtosecond fiber lasers

Zhou¹

2021

Preprint

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This dissertation presents three all-fiber designs of passively mode-locked lasers in order to achieve high pulse energy, environmentally-stable dissipative soliton (DS) operation in all-normal-dispersion cavities. A numerical model for DS mode-locked fiber lasers based on the nonlinear Schrodinger equation has been used to guide the experimental designs. Firstly, an environmentally-stable and ultra-compact SESAM mode-locked fiber laser is demonstrated. The all-fiber design is realized using a mode-field-adaptor (MFA) to couple light onto the SESAM. A polarization-maintaining fiber loop mirror serves multiple functions as a highly reflective mirror, an output coupler and polarization selector. Self-starting and stable DS mode-locking operation is achieved with 1.7 nJ pulse energy and a 22 ps pulse width. Secondly, an ultra-stable DS mode-locking was demonstrated in a long cavity ring laser with a nonlinear amplified loop mirror (NALM) as a mode-locking device. The output pulses of 32 nJ, 615 fs de-chirped pulse width were obtained with the Raman signal suppressed below -20 dB in a 81 m long cavity. The mode-locking is self-starting and the mode-locked pulse train shows excellent stability. Thirdly, the mode-laser cavity was extended with a piece of large-mode-area (LMA) fiber with a low dispersion to further scaling up the pulse energy to 56.8 nJ. The laser pulses were compressed to 750 fs by a pair of volume gratings. In the processing of scaling-up the pulse energy of the NALM mode-locked fiber laser, some interesting physical phenomena were observed, such as the operation regime transition from noise-like to DS with a sudden reduction of Raman signal and a unique waves-splitting with a stable temporal spacing. The phenomena were studied and explained in this dissertation. In addition to the mode-locked fiber laser, a CW and a Q-switched fiber lasers were also designed with a single-mode- multimode- single-mode (SMS) filter as an effective mean of overcoming nonlinear effects. The transmission spectral property of the SMS was studied which fits well with theoretical calculation. One high efficiency SMS CW fiber lasers and one SMS Q-switched fiber laser were designed which showed the effectiveness of the SMS filter for inhibiting the SRS and significantly reducing SPM.

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Section: Resultsmentioning

confidence: 99%

All-fiber passively mode-locked femtosecond fiber lasers

Zhou¹

2021

Preprint

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“…In fact, various fiber SAs have been developed for the Q-switching of YDFLs, including Tm-doped fiber SA [10], Sm-doped fiber SA [11][12][13], Cr-doped fiber SA [14] and Ho-doped fiber SA [15]. Even YDF itself is exploited as a fiber SA to Q-switch YDFLs using the mode field area mismatch technique [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Modeling of a pulsed, single cavity Yb–Bi fiber laser taking mode field area mismatch into consideration

Tao¹,

Gao²,

Luan³

et al. 2019

Laser Phys.

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A theoretical model concerning a pulsed, single cavity Yb-Bi fiber laser is established. A Q-switching rate equation is derived for mode field area mismatch operations. A stable Q-switching wavelength range and corresponding pump range of this laser system is explored, and the detailed population transition processes are described. Further, the pulse characteristics of the laser system are investigated with different pump powers at 1120 nm. The simulations show that, for a single cavity Yb-Bi fiber laser, stable passive Q-switching could be attained in a relatively wide wavelength range, and a relatively larger coupling ratio is more favorable for laser design. At a fixed wavelength, a steady region-where the pulse energy, peak power and pulse duration show little variation with the change of the pump powerexists, and the main cause is the relatively steady effective pump energy in this region.

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“…The MOPA features a great flexibility in the pulse duration and the repetition rate, but multi-stage amplifications are needed to realize high power output. The Q-switched fiber lasers can generate pulses with high peak power and high repetition rate [2] ; however, most of them use intracavity modulators, which are costly and relatively bulky [3,4] . Recently, pulsed fiber lasers without intracavity modulators are proposed by seeding the linear cavity with pulse-modulated pump LDs [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Dynamic properties of a pulse-pumped fiber laser with a short, high-gain cavity

Chaolin

Guo

et al. 2016

Optical Fiber Technology

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We demonstrate a pulsed high-gain all-fiber laser without intracavity modulators, where a short and heavily Erbium-doped fiber is used as the gain medium in a ring cavity. By pulsed-pumping this short high gain cavity and tuning an intracavity variable optical coupler, the laser generates optical pulses with a pulse-width of s at a repetition rate in the order of kHz down to one-shot operation. Furthermore, dynamic properties of this laser are investigated theoretically based on a travelling-wave-model, in which an adaptive-discrete-grid-finite-difference-method is applied. The simulation results validate the experimental results. The demonstrated pulsed laser is compact, flexible and cost-effective, which will have great potential for applications in all-optical sensing and communication systems.

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Kilowatt Peak Power Pulses From a Passively Q-Switched Yb-Doped Fiber Laser With a Smaller-Core Yb-Doped Fiber as a Saturable Absorber

Cited by 18 publications

References 15 publications

All-fiber passively mode-locked femtosecond fiber lasers

All-fiber passively mode-locked femtosecond fiber lasers

Modeling of a pulsed, single cavity Yb–Bi fiber laser taking mode field area mismatch into consideration

Dynamic properties of a pulse-pumped fiber laser with a short, high-gain cavity

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