Performance of Graphene Mediated Saturable Absorber on Stable Mode-Locked Fiber Lasers Employing Different Nano-Dispersants

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.

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Titanium Disulfide Based Saturable Absorber for Generating Passively Mode-Locked and Q-Switched Ultra-Fast Fiber Lasers

Nanomaterials ◽

10.3390/nano10101922 ◽

2020 ◽

Vol 10 (10) ◽

pp. 1922

Author(s):

Xinxin Shang ◽

Linguang Guo ◽

Huanian Zhang ◽

Dengwang Li ◽

Qingyang Yue

Keyword(s):

Saturable Absorber ◽

Fiber Lasers ◽

Laser Cavity ◽

Stable Mode ◽

Titanium Disulfide ◽

Maximum Pulse Energy ◽

Fast Fiber ◽

Absorption Performance ◽

Er Doped ◽

Photonics Devices

In our work, passively mode-locked and Q-switched Er-doped fiber lasers (EDFLs) based on titanium disulfide (TiS2) as a saturable absorber (SA) were generated successfully. Stable mode-locked pulses centred at 1531.69 nm with the minimum pulse width of 2.36 ps were obtained. By reducing the length of the laser cavity and optimizing the cavity loss, Q-switched operation with a maximum pulse energy of 67.2 nJ and a minimum pulse duration of 2.34 µs was also obtained. Its repetition rate monotonically increased from 13.17 kHz to 48.45 kHz with about a 35 kHz tuning range. Our experiment results fully indicate that TiS2 exhibits excellent nonlinear absorption performance and significant potential in acting as ultra-fast photonics devices.

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Passively mode locked thulium and thulium/holmium doped fiber lasers using MXene Nb2C coated microfiber

Scientific Reports ◽

10.1038/s41598-021-90978-x ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

H. Ahmad ◽

R. Ramli ◽

N. N. Ismail ◽

S. N. Aidit ◽

N. Yusoff ◽

...

Keyword(s):

Saturable Absorber ◽

Fiber Lasers ◽

Niobium Carbide ◽

Laser Cavity ◽

Mode Locking ◽

Stable Mode ◽

Nonlinear Properties ◽

New Class ◽

Photonics Devices

AbstractAs a result of the emergence of two-dimensional (2D) materials for various opto-electronics applications, a new class of materials named MXenes have been attracting interests due to their outstanding nonlinear properties. In this work, an MXene niobium carbide (Nb2C) was proposed and demonstrated as a saturable absorber to induce mode-locking in thulium- and thulium/holmium-doped fiber lasers. The Nb2C solution was first prepared using the liquid exfoliation technique, and then deposited onto a microfiber for integration into the laser cavity. Stable mode-locking operation was observed in both laser cavities, where the center wavelengths of the laser were recorded at 1944 nm for the TDFL and 1950 nm for the THDFL. The generated pulses in the TDFL and THDFL had repetition rates of 9.35 and 11.76 MHz respectively, while their corresponding pulse widths were 1.67 and 1.34 ps. Both of the lasers were highly stable, having SNR values of more than 52 dB and showed no major fluctuations when tested for their long-term stabilities. The results demonstrate an excellent performance of the Nb2C as a saturable absorber, offering opportunities to further explore MXenes for future photonics devices.

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Passively Mode-Locked Thulium- and Thulium/Holmium-Doped Fiber Lasers Using MXene Nb2C-Coated Microfiber

10.21203/rs.3.rs-199981/v1 ◽

2021 ◽

Author(s):

Harith Ahmad ◽

Rizal Ramli ◽

Nor Najwa Ismail ◽

Siti Nabila Aidit ◽

Norazriena Yusoff ◽

...

Keyword(s):

Saturable Absorber ◽

Fiber Lasers ◽

Niobium Carbide ◽

Laser Cavity ◽

Mode Locking ◽

Stable Mode ◽

Nonlinear Properties ◽

New Class ◽

Photonics Devices

Abstract As a result of the emergence of two-dimensional (2D) materials for various opto-electronics applications, a new class of materials named MXenes have been attracting interests due to their outstanding nonlinear properties. In this work, an MXene niobium carbide (Nb2C) was proposed and demonstrated as a saturable absorber to induce mode-locking in thulium- and thulium/holmium-doped fiber lasers. The Nb2C solution was first prepared using the liquid exfoliation technique, and then deposited onto a microfiber for integration into the laser cavity. Stable mode-locking operation was observed in both laser cavities, where the center wavelengths of the laser were recorded at 1944 nm for the TDFL and 1950 nm for the THDFL. The generated pulses in the TDFL and THDFL had repetition rates of 9.35 and 11.76 MHz respectively, while their corresponding pulse widths were 1.67 and 1.34 ps. Both of the lasers were highly stable, having SNR values of more than 52 dB and showed no major fluctuations when tested for their long-term stabilities. The results demonstrate an excellent performance of the Nb2C as a saturable absorber, offering opportunities to further explore MXenes for future photonics devices.

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

Frontiers in Physics ◽

10.3389/fphy.2021.786357 ◽

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.

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