Pulse-Width Saturation and Kelly-Sideband Shift in a Graphene-Nanosheet Mode-Locked Fiber Laser with Weak Negative Dispersion

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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Q-SWITCHED THULIUM-DOPED FIBER LASER AT 2 MICRON REGION BY 802 NM PUMPING

Jurnal Teknologi ◽

10.11113/jt.v74.4729 ◽

2015 ◽

Vol 74 (8) ◽

Author(s):

A. A. Latiff ◽

M. T. Ahmad ◽

Z. Zakaria ◽

H. Ahmad ◽

S. W. Harun

Keyword(s):

Carbon Nanotubes ◽

Pump Power ◽

Fiber Laser ◽

Saturable Absorber ◽

Pulse Width ◽

Laser Cavity ◽

Pulse Generation ◽

Q Switching ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

An 1892.4 nm ultrafast passive Q-switched fiber laser is demonstrated by using Thulium-doped fiber (TDF) in conjunction with a multi-walled carbon nanotubes (MWCNTs) as a saturable absorber (SA). The MWCNTs film is sandwiched between two FC/PC fiber connectors and integrated into the laser cavity with 802 nm pump for Q-switching pulse generation. The pulse repetition rate can be tuned from 3.8 to 4.6 kHz while the corresponding pulse width reduces from 22.1 to 18.4 μs as the pump power is increased from 187.3 to 194.2 mW. A higher performance Q-switched Thulium-doped fiber laser (TDFL) is expected to be achieved with the optimization of the MWCNT-SA saturable absorber and laser cavity.

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Pulse width shaping of passively mode-locked soliton fiber laser via polarization control in carbon nanotube saturable absorber

Optics Express ◽

10.1364/oe.21.027011 ◽

2013 ◽

Vol 21 (22) ◽

pp. 27011 ◽

Cited By ~ 18

Author(s):

Hwanseong Jeong ◽

Sun Young Choi ◽

Fabian Rotermund ◽

Dong-Il Yeom

Keyword(s):

Carbon Nanotube ◽

Fiber Laser ◽

Saturable Absorber ◽

Pulse Width ◽

Polarization Control

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Graphene slurry based passive Q-switcher in erbium doped fiber laser

Bulletin of Electrical Engineering and Informatics ◽

10.11591/eei.v8i4.1609 ◽

2019 ◽

Vol 8 (4) ◽

Author(s):

Siti Nur Fatin Zuikafly ◽

Nor Farhah Razak ◽

Rizuan Mohd Rosnan ◽

Sulaiman Wadi Harun ◽

Fauzan Ahmad

Keyword(s):

Pump Power ◽

Fiber Laser ◽

Pulse Width ◽

Peak Power ◽

Signal To Noise Ratio ◽

Pulsed Laser ◽

Laser Cavity ◽

Signal To Noise ◽

Maximum Pulse Energy ◽

Erbium Doped

In this work, a Graphene slurry based passive Q-switcher fabricated from Graphene-Polylactic acid (PLA) filament which is used for 3D printing. To produce the Graphene slurry, the diameter of the filament was reduced and Tetrahydrofuran (THF) was used to dissolve the PLA. The Graphene-THF suspension was drop cast to the end of a fiber ferrule and the THF then evaporated to develop Graphene slurry based SA which is integrated in fiber laser cavity. At threshold input pump power of 30.45 mW, a Q-switched Erbium-doped fiber laser (EDFL) can be observed with the wavelength centered at 1531.01 nm and this remained stable up to a pump power of 179.5 mW. As the pump power was increased gradually, an increase in the repetition rates was recorded from 42 kHz to 125 kHz, while the pulse width was reduced to 2.58 μs from 6.74 μs. The Q-switched laser yielded a maximum pulse energy and peak power of 11.68 nJ and 4.16 mW, respectively. The proposed Graphene slurry based saturable absorber also produced a signal-to-noise ratio of 44 dB indicating a stable Q-switched pulsed laser.

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Parametric Analysis of Laser Beam Percussion Drilling for Thin Titanium Alloy Sheet Using Yb: Yag Fiber Laser

Journal of Advanced Manufacturing Systems ◽

10.1142/s0219686721500153 ◽

2021 ◽

pp. 1-24

Author(s):

Mohit Singh ◽

Sanjay Mishra ◽

Vinod Yadava ◽

J. Ramkumar

Keyword(s):

Laser Beam ◽

Fiber Laser ◽

Pulse Width ◽

Peak Power ◽

Laser Pulses ◽

Pulse Frequency ◽

Alloy Sheet ◽

Power Pulse ◽

The Individual ◽

Percussion Drilling

Laser beam percussion drilling (LBPD) can create high density holes in aerospace materials with the repeated application of laser pulses at a single spot. In this study, one-parameter-at-a-time approach has been used to investigate the individual effect of peak power, pulse width and pulse frequency on geometrical accuracy and metallurgical distortion during LBPD of 0.85[Formula: see text]mm thick Ti–6Al–4V sheet using 200[Formula: see text]W Yb:YAG fiber laser. It has been found that the output parameters behave differently at the higher and lower values of a particular input process. The increase of pulse width from 1 to 1.50[Formula: see text]ms increases hole taper by 20% whereas the same corresponding change from 1.50 to 2.00[Formula: see text]ms reduces the taper by 20%. The increase of pulse frequency from 10 to 50[Formula: see text]Hz reduces hole circularity by 40% but the same proportionate change from 50 to 90[Formula: see text]Hz reduces circularity by 79%. Increase of peak power from 1.70 to 2.0[Formula: see text]kW increases hole taper by 8% but the corresponding increase from 2 to 2.30[Formula: see text]kW is 143%.

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