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

Abstract

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.

Methods of Radiation Wavelength Tuning in Short-Pulsed Fibre Lasers

“…The structure SMF-MMF-SMF was used in [124] as a spectrally selective element for setting the desirable radiation wavelength. Continuous tuning of the transmission spectrum of such a structure was not demonstrated, but setting a fixed radiation Smaller (several nm) wavelength shifts of ~140 fs long optical pulses were observed in a combined (fibre-discrete) cavity with a NALN [123] resulting from pumping radiation power variation [53].…”

“…The structure SMF-MMF-SMF was used in [124] as a spectrally selective element for setting the desirable radiation wavelength. Continuous tuning of the transmission spectrum of such a structure was not demonstrated, but setting a fixed radiation wavelength corresponding to the peak transmission of this structure was shown.…”

Generation of Bright–Dark Pulse Pairs in the Er-Doped Mode-Locked Fiber Laser Based on Doped Fiber Saturable Absorber

“…Additionally, the pulse width achieved with passive mode-locking is narrower than that obtained with active mode-locking. Material-based natural SAs, such as semiconductor saturable absorber mirrors (SESAM) [16], carbon nanotubes (CNT) [17], and graphene [18], are important devices for studying soliton nonlinear dynamics. However, owing to their complexity and high cost of production, their practicality is relatively low.…”

Passively Modelocked All-PM Thulium-Doped Fiber Laser at 2.07μm

“…The advantages of all-fiber lasers are well known. Especially in the field of all-fiber mode-locking technology with TDF as medium gain, some works with emission wavelengths beyond 2 m have been presented so far [13,14,15,16,17,18,19,20,21]. However, the commercial introduction of model-locked fiber lasers is hampered by their sensitivity to external disturbances.…”