scholarly journals Bright Soliton and Bright–Dark Soliton Pair in an Er-Doped Fiber Laser Mode-Locked Based on In2Se3 Saturable Absorber

2021 ◽  
Vol 9 ◽  
Author(s):  
Qin Wei ◽  
Xile Han ◽  
Huanian Zhang ◽  
Chonghui Li ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Output Power ◽  
Saturable Absorber ◽  
High Power ◽  
Fiber Lasers ◽  
Physical Vapor Deposition ◽  
Modulation Depth ◽  
Polarization State ◽  
Average Output ◽  
Stable Mode

The output power in ultrafast fiber lasers is usually limited due to the lack of a versatile saturable absorber with high damage threshold and large modulation depth. Here we proposed a more efficient strategy to improve the output energy of erbium-doped fiber laser based on indium selenide (In2Se3) prepared by using the physical vapor deposition (PVD) method. Finally, stable mode-locked bright pulses and triple-wavelength dark–bright pulse pair generation were obtained successfully by adjusting the polarization state. The average output power and pulse energy were 172.4 mW/101 nJ and 171.3 mW/100 nJ, which are significantly improved compared with the previous work. These data demonstrate that the PVD-In2Se3 can be a feasible nonlinear photonic material for high-power fiber lasers, which will pave a fresh avenue for the high-power fiber laser.

scholarly journals Two-micron all-fiberized passively mode-locked fiber lasers with high-energy nanosecond pulse

2020 ◽  
Vol 8 ◽  
Author(s):  
Meng Wang ◽  
Yijian Huang ◽  
Zongpeng Song ◽  
Jincheng Wei ◽  
Jihong Pei ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Pulse Duration ◽  
Output Power ◽  
Saturable Absorber ◽  
Pulse Energy ◽  
Fiber Lasers ◽  
Maximum Output Power ◽  
High Energy ◽  
Maximum Output ◽  
Stable Mode

We report on mode-locked thulium-doped fiber lasers with high-energy nanosecond pulses, relying on the transmission in a semiconductor saturable absorber (SESA) and a carbon nanotube (CNTs-PVA) film separately. A section of an SMF–MMF–SMF structure multimode interferometer with a transmission peak wavelength of ∼2003 nm was used as a wavelength selector to fix the laser wavelength. When the SESA acted as a saturable absorber (SA), the mode-locked fiber laser had a maximum output power of ∼461 mW with a pulse energy of ∼0.14 μJ and a pulse duration of ∼9.14 ns. In a CNT-film-based mode-locked fiber laser, stable mode-locked pulses with the maximum output power of ∼46 mW, pulse energy of ∼26.8 nJ and pulse duration of ∼9.3 ns were obtained. To the best of our knowledge, our experiments demonstrated the first 2 μm region ‘real’ SA-based dissipative soliton resonance with the highest mode-locked pulse energy from a ‘real’ SA-based all-fiberized resonator.

scholarly journals Improved Laser Damage Threshold of In2Se3 Saturable Absorber by PVD for High-Power Mode-Locked Er-Doped Fiber Laser

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1216 ◽  
Author(s):  
Han ◽  
Zhang ◽  
Jiang ◽  
Zhang ◽  
Li ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Output Power ◽  
Saturable Absorber ◽  
High Power ◽  
Average Output Power ◽  
Damage Threshold ◽  
Laser Damage Threshold ◽  
Average Output ◽  
Highly Nonlinear ◽  
Er Doped

In this study, a double-end pumped high-power passively mode-locked erbium-doped fiber laser (EDFL) was realized by employing a few-layered In2Se3 flakes as a saturable absorber (SA). Herein, the uniform large-scale In2Se3 flakes were synthesized by the physical vapor deposition (PVD) method. The PVD-In2Se3 SA exhibited a remarkable damage threshold of higher than 24 mJ/cm2. Meanwhile, the PVD-In2Se3 SA had a modulation depth and saturable intensity of 18.75% and 6.8 MW/cm2, respectively. Based on the In2Se3 SA, the stable bright pulses emitting at 1559.4 nm with an average output power/pulse energy/pulse duration of 122.4 mW/5.8 nJ/14.4 ns were obtained successfully. To our knowledge, 122.4 mW was the new major breakthrough of mode-locked Er-doped fiber lasers. In addition, this is the first demonstration of the dark-bright pulse pair generation based on In2Se3 SA. The maximum average output power of the dark-bright pulse reached 121.2 mW, which also showed significant enhancement in comparison with previous works. Our excellent experiment results fully prove the superiority of our experimental design scheme and indicate that the PVD-In2Se3 could operate as a promising highly-nonlinear photonic material for a high-power fiber laser.

scholarly journals Highly efficient mode-locked and Q-switched Er3+-doped fiber lasers using a gold nanorod saturable absorber

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yin-Wen Lee ◽  
Chien-Ming Chen ◽  
Wei-Hsiang Chuang ◽  
Ching-Yi Cho ◽  
Cheng-Hsien Yu ◽  
...  
Keyword(s):  
Thin Film ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Fiber Lasers ◽  
Modulation Depth ◽  
Maximum Energy ◽  
Gold Nanorod ◽  
Dual Function ◽  
Saturation Intensity ◽  
Pulsed Fiber Laser

AbstractMode-locked and Q-switched pulsed fiber laser sources with wavelengths of 1.55 μm are widely used in various fields. Gold nanorods (GNRs) have been applied in biomedicine and optics owing to their biocompatibility, easy fabrication, and unique optical properties. This paper presents the analysis of a saturable absorber based on a colloidal gold nanorod (GNR) thin film for dual-function passively mode-locked and Q-switched 1.55-μm fiber lasers. The colloidal GNR thin film possesses superior properties such as a wide operating wavelength range, large nonlinear absorption coefficient, and a picosecond-order recovery time. Its modulation depth and saturation intensity at 1.55 μm are 7.8% and 6.55 MW/cm2, respectively. Passive mode-locked or Q-switched laser operation is achieved by changing the number of GNR thin-film layers. The advantages of these high-quality GNRs in mode-locked and Q-switched fiber lasers with record-high slope efficiency are verified by conducting comprehensive material and laser dynamic analyses. The self-starting mode-locked fiber laser with an efficiency as high as 24.91% and passively Q-switched fiber laser with the maximum energy of 0.403 μJ are successfully demonstrated. This paper presents the novel demonstration of reconfigurable mode-locked and Q-switched all-fiber lasers by incorporating colloidal GNR thin films.

scholarly journals Generation and dynamics of soliton and soliton molecules from a VSe2/GO-based fiber laser

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Benhai Wang ◽  
Haobin Han ◽  
Lijun Yu ◽  
Yueyue Wang ◽  
Chaoqing Dai
Keyword(s):  
Numerical Simulation ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Pulse Width ◽  
Fiber Lasers ◽  
Modulation Depth ◽  
Mode Locking ◽  
Pulse Interval ◽  
Saturable Absorption ◽  
Soliton Dynamics

Abstract Recently, in addition to exploring the application of new saturable absorber devices in fiber lasers, soliton dynamics has also become a focus of current research. In this article, we report an ultrashort pulse fiber laser based on VSe2/GO nanocomposite and verify the formation process of soliton and soliton molecules by the numerical simulation. The prepared VSe2/GO-based device shows excellent saturable absorption characteristics with a modulation depth of 14.3% and a saturation absorption intensity of 0.93 MW/cm2. The conventional soliton is obtained with pulse width of 573 fs, which is currently the narrowest pulse width based on VSe2-related material, and has a signal-to-noise ratio of 60.4 dB. In addition, the soliton molecules are realized based on the VSe2/GO for the first time and have a pulse interval of ∼2.2 ps. We study the soliton dynamics through numerical simulation and reveal that before the formation of the soliton, it undergoes multiple nonlinear stages, such as soliton mode-locking, soliton splitting, and soliton oscillation. Furthermore, the results of numerical simulation are agreed well with the experimental data. These results indicate that the VSe2/GO might be another promising saturable absorber material for ultrafast photonics, and deepen the understanding of soliton dynamics in ultrafast fiber lasers.

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

2015 ◽  
Vol 24 (01) ◽  
pp. 1550001 ◽  
Author(s):  
Haitao Huang ◽  
Deyuan Shen ◽  
Jian Zhang ◽  
Dingyuan Tang
Keyword(s):  
Fiber Laser ◽  
Output Power ◽  
Saturable Absorber ◽  
Average Output Power ◽  
Repetition Rate ◽  
Mode Locking ◽  
Average Output ◽  
Q Switching ◽  
Ceramic Laser ◽  
Switching Mode

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.

scholarly journals Stable Q-Switched Mode-Locking of 2.7 μm Er:Y2O3 Ceramic Laser Using a Semiconductor Saturable Absorber

2018 ◽  
Vol 8 (7) ◽  
pp. 1155 ◽  
Author(s):  
Hao Xue ◽  
Li Wang ◽  
Wei Zhou ◽  
Haotian Wang ◽  
Jun Wang ◽  
...  
Keyword(s):  
Saturable Absorber ◽  
Average Output Power ◽  
Doping Concentration ◽  
Modulation Depth ◽  
Mode Locking ◽  
Average Output ◽  
Stable Mode ◽  
High Brightness ◽  
Semiconductor Saturable Absorber ◽  
Ceramic Laser

This paper studies synchronous Q-switch and mode-locking of an 2.7 μm Er:Y2O3 ceramic laser pumped with a high brightness 976 nm fiber laser and using a semiconductor saturable absorber mirror. The Er:Y2O3 ceramic is home-developed with Er3+ doping concentration of 7 at.%. The laser generated ~92 mW of average output power with stable mode-locked pulses of 100% modulation depth and 130 MHz repetition rate embedded inside Q-switched envelopes of ~1.2 μs width. Repetition rates of the Q-switched pulse envelopes are tunable from 5.1 kHz to 29 kHz with the width varying from 2.7 μs to 1.2 μs.

scholarly journals Passively Q-switched Yb-doped all-fiber laser based on Ag nanoplates as saturable absorber

Nanophotonics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 3873-3880
Author(s):  
Bo Fu ◽  
Pan Wang ◽  
Yan Li ◽  
Marcello Condorelli ◽  
Enza Fazio ◽  
...  
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Modulation Depth ◽  
Single Pulse ◽  
Average Output ◽  
Saturable Absorbers ◽  
Maximum Average Output Power ◽  
Easy Integration ◽  
First Time

AbstractWe report on a Q-switched Yb-doped all-fiber laser based on a solution-processed Ag nanoplates saturable absorber. Optical deposition procedure is implemented to transfer the Ag nanoplates onto the fiber core area through the thermal effect. The saturable absorber is sandwiched between two fiber connectors, providing simplicity, flexibility, and easy integration into the laser oscillator. The modulation depth and saturation incident fluence are measured to be ~5.8% and ~106.36 μJ/cm2 at 1-μm region, respectively. Self-started stable Q-switched operation is achieved for a threshold pump power of 180 mW. The repetition rates of the pulse trains range from 66.6 to 184.8 kHz when the pump power scales from 210 to 600 mW. The maximum average output power is 10.77 mW, corresponding to the single-pulse energy of 58.3 nJ and minimum pulse duration of ~1.01 μs. To the best of our knowledge, it is the first time that the Ag nanoplates saturable absorbers are utilized in the 1-μm Yb-doped Q-switched fiber laser.

scholarly journals Highly Stable Passively Q-Switched Erbium-Doped All-Fiber Laser Based on Niobium Diselenide Saturable Absorber

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4303
Author(s):  
Ping Hu ◽  
Jiajia Mao ◽  
Hongkun Nie ◽  
Ruihua Wang ◽  
Baitao Zhang ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Saturable Absorber ◽  
Pulse Width ◽  
Nonlinear Optical ◽  
Modulation Depth ◽  
Transition Metal Dichalcogenide ◽  
Center Wavelength ◽  
Niobium Diselenide ◽  
Erbium Doped ◽  
Layered Transition Metal

A saturable absorber (SA) based on niobium diselenide (NbSe2), which is a layered transition metal dichalcogenide (TMD) in the VB group, is fabricated by the optically driven deposition method, and the related nonlinear optical properties are characterized. The modulation depth, saturable intensity, and nonsaturable loss of the as-prepared NbSe2 nanosheet-based SA are measured to be 16.2%, 0.76 MW/cm2, and 14%, respectively. By using the as-fabricated NbSe2 SA, a highly stable, passively Q-switched, erbium-doped, all-fiber laser is realized. The obtained shortest pulse width is 1.49 μs, with a pulse energy of 48.33 nJ at a center wavelength of 1560.38 nm. As far as we know, this is the shortest pulse duration ever obtained by an NbSe2 SA in a Q-switched fiber laser.

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