A graphene-based passively<i>Q</i>-switched polycrystalline Er:YAG ceramic laser operating at 1645 nm

Zhu, Zhiwei; Wang, Y; Chen, H; Huang, H. K.; Shen, Deyuan; Zhang, J; Tang, Dingyuan

doi:10.1088/1612-2011/10/5/055801

Cited by 31 publications

(16 citation statements)

References 26 publications

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“…Moreover, the modulation depth of graphene saturable absorber increases by increasing the number of graphene layers, which will shorten the pulse duration in the Q-switched laser system. According to [15], the thickness of graphene film should be three atomic layers. Figure 1.…”

Section: Methodsmentioning

confidence: 99%

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A passively Q-switched Ho:YVO4 Laser at 2.05 μm with Graphene Saturable Absorber

et al. 2016

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Abstract:We report a passively Q-switched Ho:YVO 4 laser pumped at 1.94 µm with multilayer graphene as a saturable absorber. At the absorbed pump power of 9.3 W, the maximum average output power of 2.2 W was obtained in Ho:YVO 4 laser with minimum pulse width of 265.2 ns and pulse repetition rate of 131.6 kHz at 2052.1 nm. In addition, a beam quality factor of M 2~1 .7 was measured at the maximum output level. This is, as far as we know, the first time that graphene has been used in a passively Q-switched Ho:YVO 4 laser.

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Section: Methodsmentioning

confidence: 99%

“…In 2013, Z.X. Zhu demonstrated a passive Q-switched Er:YAG laser with an average output power of 528 mW and the pulse energy of 7.08 µJ [15]. Up to now, graphene has also been employed as a saturable absorber in Q-switched laser sources operating in 2 µm.…”

Section: Introductionmentioning

confidence: 99%

A passively Q-switched Ho:YVO4 Laser at 2.05 μm with Graphene Saturable Absorber

et al. 2016

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“…In 2010, a composite Er:YAG ceramic laser generated a quasi-CW output power of 6.8 W at 1645 nm and the corresponding slope efficiency of 56.9 % with respect to the absorbed pump power. In the next year, Zhang et al [10][11][12] reported a 1617-nm Er:YAG ceramic which yielded an output power of 14 W corresponding to a slope efficiency of 51.7 % with respect to the incident pump power. In the Q-switched mode, the laser performance of the Er:YAG ceramic laser has been reported by using graphene as saturable absorber.…”

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confidence: 99%

Passively Q-switched 1617-nm polycrystalline ceramic Er:YAG laser using a Cr:ZnSe saturable absorber

et al. 2015

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methane in the atmosphere, the 1617-nm transition is more promising for applications which need long-distance propagation in free space than the 1645-nm transition [2,3].YAG crystal is used as the most common laser gain host because of its unique thermomechanical properties. Er:YAG crystal lasers have been demonstrated both in continuous-wave and Q-switched modes [1][2][3][4][5]. In 2007, a single-crystal Er:YAG which yielded a continuous-wave (CW) output power of 31 W was demonstrated at 1617 nm with a slope efficiency of 47 % with respect to incident pump power [3]. In 2011, an actively Q-switched 1617-nm single-crystal Er:YAG laser with pulse energy up to 30.5 mJ and pulse duration of <20 ns at 20 Hz repetition rate has been reported [4]. However, the conventional crystals cannot be made in large scale or fabricated composite with a complicated configuration to enhance the laser performance [6]. As a novel laser medium, the polycrystalline ceramics are advantageous over single crystals in many aspects, such as rapid and large volume fabrication, flexibility in doping concentration and profile, and low cost. With the development of the ceramic fabrication technology, the Er:YAG ceramic laser has been reported to have similar laser efficiency and spectroscopic parameters to those of the single crystals [7][8][9]. In 2010, a composite Er:YAG ceramic laser generated a quasi-CW output power of 6.8 W at 1645 nm and the corresponding slope efficiency of 56.9 % with respect to the absorbed pump power. In the next year, Zhang et al. [10][11][12] reported a 1617-nm Er:YAG ceramic which yielded an output power of 14 W corresponding to a slope efficiency of 51.7 % with respect to the incident pump power. In the Q-switched mode, the laser performance of the Er:YAG ceramic laser has been reported by using graphene as saturable absorber. However, the graphene Q-switched lasers typically have pulse durations of the order of microseconds. To get short pulse Abstract We report on a passively Q-switched polycrystalline ceramic Er:YAG laser by using a Cr:ZnSe crystal as a saturable absorber. When pumped by a 1532-nm Er-, Yb-doped fiber laser with the maximum power of 12.4 W, the laser yielded pulses of 28.8 ns duration at 1617 nm by using a saturable absorber with an initial transmission of 80 %. The corresponding peak power was up to 11.3 kW at a repetition rate of 2.17 kHz. The dependence of the pulse duration and repetition rate on the pump power was experimentally studied. The numerical and experimental results both show that the pulse duration was mainly determined by the initial transmission of the saturable absorber and slightly affected by the transmission of the output coupler. At last, we give some prospects for further narrowing down the pulse duration.

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“…[11][12][13] Gao et al and Zhu et al have demonstrated graphene-based passive Q-switching of the Er:YAG lasers at 1.6 µm, respectively. 14,15 Recently, a great deal of attention has been paid to the Q-switched mode locking (QML) using graphene as the modulation device. 16,17 QML is an operation regime of a passively mode-locked laser, which is characterized by the superposition of a Q-switched envelope and continuous mode-locked pulses.…”

Section: Introductionmentioning

confidence: 99%

Q-switched mode locking of a fiber laser resonantly pumped Er:YAG ceramic laser at 1645 nm using graphene as saturable absorber

Huang

Shen

Zhang

et al. 2015

J. Nonlinear Optic. Phys. Mat.

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A fiber laser resonantly pumped Q-switched mode locked Er:YAG ceramic 1645 nm laser using graphene as the saturable absorber is realized. The mode-locked pulses with average output power of 320 mW, Q-switching envelope temporal width of 10 µs and mode-locking repetition rate of 83 MHz can readily be generated from the laser. To the best of our knowledge, this is the first report on the graphene-based Q-switching mode locked Er:YAG ceramic laser emitting around 1645 nm.

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A graphene-based passivelyQ-switched polycrystalline Er:YAG ceramic laser operating at 1645 nm

Cited by 31 publications

References 26 publications

A passively Q-switched Ho:YVO4 Laser at 2.05 μm with Graphene Saturable Absorber

A passively Q-switched Ho:YVO4 Laser at 2.05 μm with Graphene Saturable Absorber

Passively Q-switched 1617-nm polycrystalline ceramic Er:YAG laser using a Cr:ZnSe saturable absorber

Q-switched mode locking of a fiber laser resonantly pumped Er:YAG ceramic laser at 1645 nm using graphene as saturable absorber

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