Chirped pulse amplified dissipative-soliton Erbium-doped fiber lasers

Abstract

An all-fiber amplification and compression system seed is demonstrated by using a chirped pulse oscillator at the telecommunication band. Dispersion management is applied successfully both in the oscillator and amplifier, allowing dissipative soliton (DS) generation and amplification. The oscillator generates 4-ps chirped pulses with 130 mW (4.55 nJ) average power. Benefiting from large chirp and the high energy of DSs from the oscillator, the amplification system can be simplified. The average power after amplification is increased to 324.2 mW, corresponding to a single pulse energy of 11.3 nJ. The minimum pulse duration is 190 fs after the single-mode fiber (SMF) is employed to compress the pulses. The repetition rate of pulses is 28.6 MHz.

Soliton amplification in gain medium governed by Ginzburg–Landau equation

“…Different physical effects affecting soliton amplification have been discussed [20]. Dispersion management has been applied successfully both in the oscillator and amplifier, allowing dissipative soliton generation and amplification [32]. The standard Ginzburg-Landau (GL) equation containing both gain dispersion and gain saturation term has been used to describe the amplification process of solitons [1].…”

Controllable Synthesis of Narrow-Gap van der Waals Semiconductor Nb2GeTe4 with Asymmetric Architecture for Ultrafast Photonics

“…Compared with the conventional semiconductor SA mirror and other artificial SAs, − real SAs implemented with layered van der Waals (vdW) materials boast low cost, a compact structure, a simple setup, and an adjustable operating bandwidth. − Currently, various vdW materials have been investigated for ultrafast photonics, including transition-metal dichalcogenides (TMDCs) (i.e., MoS 2 , NbS 2 , Ag 2 S, HfS 2 , WSe 2 ), − topological insulators (TIs) (i.e., Bi 2 Te 3 , Sb 2 Te 3 , Bi 2 Se 3 ), − MXenes (i.e., Ti 3 C 2 T x , Mo 2 C), − black phosphorus, and transition-metal phosphorus trichalcogenides (i.e., FePSe 3 , NiPS 3 , MnPSe 3 ). − Generally speaking, these vdW SA-based pulse generations follow the Fourier transform limitation, essentially stating that the product of temporal uncertainty (or pulse duration) and frequency uncertainty (or bandwidth) is minimized . To obtain an ultrafast pulse, the generation of a wide spectrum is necessary, though chirps often occur because of dispersion, Kerr effect, and some other influences in the practical pulse. − Actually, the majority of vdW material SA-based pulse lasers manifest narrow spectral bandwidth (<10 nm), and the as-generated pulses are commonly limited to picosecond or sub-picosecond. ,,,, Rare vdW material SA-based ultrafast mode-locked lasers delivered a wide 3 dB spectral bandwidth, , which produced femtosecond ultrashort pulses. Consequently, to achieve an ultrashort pulse, it is an ongoing task to search for appropriate vdW material SAs endow ultrafast mode-locked lasers with ultrashort durations and broad spectra.…”