A linear array of N mutually coupled single-mode lasers is investigated. It is shown that the intensities of N lasers are chaotically synchronized when the coupling between lasers is relatively strong. The chaotic syn...A linear array of N mutually coupled single-mode lasers is investigated. It is shown that the intensities of N lasers are chaotically synchronized when the coupling between lasers is relatively strong. The chaotic synchronization of intensities depends on the location of the lasers in the array. The chaotic synchronization appears between two outmost lasers, the second two outmost lasers, etc. There is no synchronization between nearest neighbors of the lasers. If the number of N is odd, the middle laser is never synchronized between any lasers. The chaotic synchronization of phases between nearest lasers in the array is examined by using the analytic signal and the Gaussian filter methods based on the peak of the power spectrum of the intensity. It can be seen that the message of chaotic intensity synchronization is conveyed through the phase synchronization.展开更多
The laser output characteristics under elliptically polarized optical feedback effect are studied. Elliptically polarized light is generated by wave plate placed in the feedback cavity. By analyzing the amplitude and ...The laser output characteristics under elliptically polarized optical feedback effect are studied. Elliptically polarized light is generated by wave plate placed in the feedback cavity. By analyzing the amplitude and phase of the laser output in the orthogonal direction, some new phenomena are firstly discovered and explained theoretically.Elliptically polarized feedback light is amplified in the gain medium in the resonator, and the direction perpendicular to the original polarization direction is easiest to oscillate. The laser intensity variation in amplitude and phase are related to the amplified mode and the anisotropy of external cavity. The theoretical analysis and experimental results agree well. Because the output characteristic of the laser has a relationship with the anisotropy of the external cavity, the phenomenon also provides a method for measuring birefringence.展开更多
Engineering ultrashort laser pulses is crucial for advancing fundamental research fields and applications.Controlling their spatiotemporal behavior,tailored to specific applications,can unlock new experimental capabil...Engineering ultrashort laser pulses is crucial for advancing fundamental research fields and applications.Controlling their spatiotemporal behavior,tailored to specific applications,can unlock new experimental capabilities.However,achieving this control is particularly challenging due to the difficulty in independently structuring their intensity and spatial phase distributions,given their polychromatic bandwidth.This article addresses this challenge by presenting a technique for generating flying structured laser pulses with tunable spatiotemporal behavior.We developed a comprehensive approach to directly design and govern these laser pulses.This method elucidates the role jointly played by the pulse's spatiotemporal couplings and its prescribed phase gradient in governing the pulse dynamics.It evidences that the often-overlooked design of the phase gradient is indeed essential for achieving programmable spatiotemporal control of the pulses.By tailoring the prescribed phase gradient,we demonstrate the creation of,to our knowledge,novel families of flying structured laser pulses that travel at the speed of light in helical spring and vortex multi-ring forms of different geometries.The achieved control over the dynamics of their intensity peaks and wavefronts is analyzed in detail.For instance,the intensity peak can be configured as a THz rotating light spot or shaped as a curve,enabling simultaneous substrate illumination at rates of tens of THz,far exceeding the MHz rates typically used in laser material processing.Additionally,the independent manipulation of the pulse wavefronts allows local tuning of the orbital angular momentum density carried by the beam.Together,these advancements unveil advantageous capabilities that have been sought after for many years,especially in ultrafast optics and light-matter interaction research.展开更多
文摘A linear array of N mutually coupled single-mode lasers is investigated. It is shown that the intensities of N lasers are chaotically synchronized when the coupling between lasers is relatively strong. The chaotic synchronization of intensities depends on the location of the lasers in the array. The chaotic synchronization appears between two outmost lasers, the second two outmost lasers, etc. There is no synchronization between nearest neighbors of the lasers. If the number of N is odd, the middle laser is never synchronized between any lasers. The chaotic synchronization of phases between nearest lasers in the array is examined by using the analytic signal and the Gaussian filter methods based on the peak of the power spectrum of the intensity. It can be seen that the message of chaotic intensity synchronization is conveyed through the phase synchronization.
基金Supported by the Program for Changjiang Scholars and Innovative Research Team in University under Grant No IRT160R7
文摘The laser output characteristics under elliptically polarized optical feedback effect are studied. Elliptically polarized light is generated by wave plate placed in the feedback cavity. By analyzing the amplitude and phase of the laser output in the orthogonal direction, some new phenomena are firstly discovered and explained theoretically.Elliptically polarized feedback light is amplified in the gain medium in the resonator, and the direction perpendicular to the original polarization direction is easiest to oscillate. The laser intensity variation in amplitude and phase are related to the amplified mode and the anisotropy of external cavity. The theoretical analysis and experimental results agree well. Because the output characteristic of the laser has a relationship with the anisotropy of the external cavity, the phenomenon also provides a method for measuring birefringence.
基金Ministerio de Ciencia,Innovación y Universidades(PID2021-125483NB-I00,PGC2018-095595-B-I00)。
文摘Engineering ultrashort laser pulses is crucial for advancing fundamental research fields and applications.Controlling their spatiotemporal behavior,tailored to specific applications,can unlock new experimental capabilities.However,achieving this control is particularly challenging due to the difficulty in independently structuring their intensity and spatial phase distributions,given their polychromatic bandwidth.This article addresses this challenge by presenting a technique for generating flying structured laser pulses with tunable spatiotemporal behavior.We developed a comprehensive approach to directly design and govern these laser pulses.This method elucidates the role jointly played by the pulse's spatiotemporal couplings and its prescribed phase gradient in governing the pulse dynamics.It evidences that the often-overlooked design of the phase gradient is indeed essential for achieving programmable spatiotemporal control of the pulses.By tailoring the prescribed phase gradient,we demonstrate the creation of,to our knowledge,novel families of flying structured laser pulses that travel at the speed of light in helical spring and vortex multi-ring forms of different geometries.The achieved control over the dynamics of their intensity peaks and wavefronts is analyzed in detail.For instance,the intensity peak can be configured as a THz rotating light spot or shaped as a curve,enabling simultaneous substrate illumination at rates of tens of THz,far exceeding the MHz rates typically used in laser material processing.Additionally,the independent manipulation of the pulse wavefronts allows local tuning of the orbital angular momentum density carried by the beam.Together,these advancements unveil advantageous capabilities that have been sought after for many years,especially in ultrafast optics and light-matter interaction research.
