We demonstrate the temporal manipulation of spatiotemporal optical vortices(STOVs)by utilizing Airy pulses.By combining a STOV with an Airy temporal profile,the STOV exhibits nondispersive,self-accelerating,and self-h...We demonstrate the temporal manipulation of spatiotemporal optical vortices(STOVs)by utilizing Airy pulses.By combining a STOV with an Airy temporal profile,the STOV exhibits nondispersive,self-accelerating,and self-healing features inherited from the Airy pulse propagation.Such features will enhance the control of STOVs in time.展开更多
While the performance of mode-locked fiber lasers has been improved significantly,the limited gain bandwidth restricts them from generating ultrashort pulses approaching a few cycles or even shorter.Here we present a ...While the performance of mode-locked fiber lasers has been improved significantly,the limited gain bandwidth restricts them from generating ultrashort pulses approaching a few cycles or even shorter.Here we present a novel method to achieve few-cycle pulses(~5 cycles)with an ultrabroad spectrum(~400 nm at-20 dB)from a Mamyshev oscillator configuration by inserting a highly nonlinear photonic crystal fiber and a dispersion delay line into the cavity.A dramatic intracavity spectral broadening can be stabilized by the unique nonlinear processes of a self-similar evolution as a nonlinear attractor in the gain fiber and a"perfect"saturable absorber action of the Mamyshev oscillator.To the best of our knowledge,this is the shortest pulse width and broadest spectrum directly generated from a fiber laser.展开更多
Complex Swift Hohenberg equation(CSHE)has attracted intensive research interest over the years,as it enables realistic modeling of mode-locked lasers with saturable absorbers by adding a fourth-order term to the spect...Complex Swift Hohenberg equation(CSHE)has attracted intensive research interest over the years,as it enables realistic modeling of mode-locked lasers with saturable absorbers by adding a fourth-order term to the spectral response.Many researchers have reported a variety of numerical solutions of CSHE which reveal interesting pulse patterns and structures.In this work,we have demonstrated a CSHE dissipative soliton fiber laser experimentally using a unique spectral filter with a complicated transmission profile.The behavior and performance of the laser agree qualitatively with the numerical simulations based on CSHE.Our findings bring insight into dissipative soliton dynamics and make our mode-locked laser a powerful testbed for observing dissipative solitons of CSHE,which may open a new course in ultrafast fiber laser research.展开更多
基金supported by the Pusan National University Research Grant,2022,and the National Research Foundation of Korea(NRF)funded by the Korea government(MSIT)(No.2022R1A2C1091890).
文摘We demonstrate the temporal manipulation of spatiotemporal optical vortices(STOVs)by utilizing Airy pulses.By combining a STOV with an Airy temporal profile,the STOV exhibits nondispersive,self-accelerating,and self-healing features inherited from the Airy pulse propagation.Such features will enhance the control of STOVs in time.
文摘While the performance of mode-locked fiber lasers has been improved significantly,the limited gain bandwidth restricts them from generating ultrashort pulses approaching a few cycles or even shorter.Here we present a novel method to achieve few-cycle pulses(~5 cycles)with an ultrabroad spectrum(~400 nm at-20 dB)from a Mamyshev oscillator configuration by inserting a highly nonlinear photonic crystal fiber and a dispersion delay line into the cavity.A dramatic intracavity spectral broadening can be stabilized by the unique nonlinear processes of a self-similar evolution as a nonlinear attractor in the gain fiber and a"perfect"saturable absorber action of the Mamyshev oscillator.To the best of our knowledge,this is the shortest pulse width and broadest spectrum directly generated from a fiber laser.
文摘Complex Swift Hohenberg equation(CSHE)has attracted intensive research interest over the years,as it enables realistic modeling of mode-locked lasers with saturable absorbers by adding a fourth-order term to the spectral response.Many researchers have reported a variety of numerical solutions of CSHE which reveal interesting pulse patterns and structures.In this work,we have demonstrated a CSHE dissipative soliton fiber laser experimentally using a unique spectral filter with a complicated transmission profile.The behavior and performance of the laser agree qualitatively with the numerical simulations based on CSHE.Our findings bring insight into dissipative soliton dynamics and make our mode-locked laser a powerful testbed for observing dissipative solitons of CSHE,which may open a new course in ultrafast fiber laser research.
