We demonstrate a compact tunable and switchable dual-wavelength fiber laser based on the Lyot filtering effect spontaneous radiation peaks of gain fiber. By introducing period polarization-maintain Er-doped (PM-EDF), stable pulses can operate in both anomalous dispersion region normal region. The corresponding repetition frequency difference dual wavelengths has excellent stability while relative center wavelength be adjusted range 5 nm to 13 nm. There is no existence significant sidebands...

We demonstrate a passively Q-switched ytterbium-doped fiber laser based on black phosphorus (BP) flakes covered microfiber. The BP saturable absorber is fabricated by sandwiching microfiber between two pieces of polydimethylsiloxane supported film, which prepared the mechanical exfoliation method. In this case can be well protected from action air and moisture. By incorporating into ring laser, stable reliable operation at 1064 nm realized via interaction few-layers evanescent field laser....

We present results of our research on the observation a bound state double dissipative-soliton operation passive mode-locked Yb-doped fiber laser based nonlinear polarization rotation mechanism through proper adjustment wave plates. The generated dissipative solitons with large net positive cavity Group Velocity Dispersion (GVD) are characterized by their spectral profile sharp peaks near edges, which distinct from those conventional in lasers. By using an artificial saturable absorber, we...

We demonstrate for the first time, to our knowledge, an all-fiber erbium-doped mode-locked laser in which mode-locking (ML) is realized by combination of nonlinear polarization rotation and a saturable dynamic filtering effect, thereby generating nearly transform-limited ultrashort pulses with pulse duration spectral width 45.2 ps 0.0775 nm, respectively. The achieves both ML harmonic increasing pump power. Simultaneously, function maintained induced grating (SDIG) throughout...

We experimentally and numerically demonstrate the all-normal dispersion (ANDi) ytterbium (Yb)-doped fiber laser based on nonlinear amplifying loop mirror (NALM) mode-locked, which allows tunable single-wavelength dual-wavelength outputs. The pulses tuning ranges of are from 1032.24 nm to 1053.13 1047.94 1069.05 nm, repetition frequency difference varies 1766Hz 1834Hz. To our knowledge, this is widest range Yb-doped lasers NALM mode-locked. test for 90 minutes have high stability in both...

Abstract We demonstrate an all fiber high-repetition-rate erbium-doped ultrashort laser based on the Ti 3 C 2 T x -Mxene saturable absorber (SA), and 56th harmonic mode-locking with a repetition rate of 622.2 MHz, central wavelength 1590.7 nm, pulse duration 1.31 ps is achieved. Meanwhile, dual-wavelength pulses are also realized, wavelengths 1575.6, 1587.5 nm. The results work indicate that outstanding SA for generating or modulating light diversity Mxene family can bring new vigor vitality...

We report a Yb-doped mode-locked fiber laser based on nonlinear amplifying loop mirror (NALM), which is all-normal-dispersion (ANDi), and allows the output wavelength to be tunable. The can generate stable femtosecond dissipative soliton with maximum power of 196 mW. Its repetition rate 112.4 MHz, final pulse duration 236 fs. By adjusting angle reflective diffraction grating, was realized tune tuning range 54 nm from 1011.8 1065.6 nm. To best our knowledge, this widest an ANDi NALM.

We demonstrate a passively Q-switched Tm3+-doped all-fiber laser (TDFL) at around 2 μm with graphene-based saturable absorber (SA). The graphene is prepared by the reduction of graphite oxide (GO), deposited on fiber core and inserted into linear cavity as passive Q-switch. A 793 nm diode (LD) used pump source, maximum power 200 mW. output ~33.5 mW obtained mW, high optical conversion efficiency about 17%. corresponding single pulse energy 260 nJ repetition rate 128 kHz.

We experimentally demonstrate a wavelength-tunable passively mode-locked Yb-doped all-normal-dispersion fiber laser by exploiting high-birefringence Sagnac loop as flexible filter. The wavelength of pulses is controlled properly rotating the polarization controllers in loop. spectrum output could be shifted up to 15 nm at repetition rate 18 MHz. Output power more than 43 mW pulse durations below 11.4 ps achieved central 1035 nm. temporal frequency and change slightly over tunable range.

We investigate numerically the impact of spectral filtering on pulse characteristics in anomalous dispersion erbium-doped fiber laser mode-locked with carbon nanotube-based saturable absorber. The can operate only a single-pulse state without filter, while it will transit to bound soliton states once saturation energy gain and bandwidth filter are carefully chosen, respectively. Further analyzation shows that operation lasing from dissipative conventional be selectively targeted by changing...

In this Letter, a single-frequency fiber laser using molybdenum disulfide (MoS2) thin film as saturable absorber is demonstrated. We use short length of highly Yb-doped the gain medium and ferrule with MoS2 adhered to it by index matching gel (IMG) that acts absorber. The can be used discriminate select single longitudinal modes. maximum output power 15.3 mW at pump 130 slope efficiency 15.3%. optical signal-to-noise ratio linewidths are ～60 dB 5.89 kHz, respectively.

In this article, we report, to the best of our knowledge, first observation reverse self-sweeping phenomenon in an all-polarization-maintaining bidirectional ytterbium-doped fiber laser. Conventional behaviors, including dependence sweeping range, rate and average pulse repetition on pump power, can be observed Two couplers with ratio 50/50 10/90 are respectively employed as output coupler laser, which generates for comparison.

We reported an all-polarization-maintaining single-frequency ytterbium-doped bidirectional fiber laser for the first time, to best of our knowledge. Single-frequency operation was achieved by a stable dynamic grating in active proper length owing laser. The possesses linewidth 7.43 kHz, slope efficiency 47.9%, and great long-term stability.

Generally speaking, the self-sweeping effect relies on dynamical grating formed in a gain fiber. Here, normal was generated pump-free ytterbium-doped fiber which serves as saturable absorber and is introduced to laser cavity by circulator this experiment. The sweeping rate range alter usual, both of can be controlled pump power. Further, new self-pulse signal observed discussed work, shows difference effects between active absorber.