Research On Generation Of Self-accelerating Bessel-like Beams And Its Application

With the development of the laser technology, the beam experiences from the initialdiffracting Gaussian beam to non-diffracting Bessel beam and Airy beam, while itstrajectory goes from straight line(Bessel beam) to the self-accelerating parabola(Airy beam).Right now the laser technology is facing with mounting challenges posed by the newintelligent beams and practical application. In practical application sphere, it is an openproblem to generate intelligent, controllable trajectory laser bullets or laser weapons. Thedemand of the intelligent optical tweezers grows in importance in micro manipulation.Meanwhile, how to realize high efficiency beam deflection and steering in phased arraylaser technique has become a urgent and significant issue currently.On the basis of theoretical research and the actual application demand, this thesis startswith introducing the beam split-step Fourier method(BSSF). The Bessel-like beams aredesigned by employing phase modulation method. These non-diffracting andself-accelerating propagation properties are theoretically analyzed and experimentallydemonstrated. The main content of this thesis includes the following aspects:1. Initially demonstrate these zero-order Bessel-like beams with arbitrarytrajectory in experiment. Here we analyze and solve the phase of the zero-orderBessel-like beams in theory. Based on the split-step Fourier method, the simulation resultsof these beams are shown with non-diffracting main lobe and controllable trajectories.Based on the computer generated holography, the self-accelerating zero-order Bessel-likeoptical beams with parabolic, snake-like, hyperbolic, hyperbolic secant, and even3Dspiraling trajectories are experimentally demonstrated.2. Initially propose and study the self-breathing Bessel-like beams, the Bessel-likeHermite-Gaussian optical beams, the vortex Bessel-like beams, the self-acceleratingrotating beams and flower-like beams. The theoretical model of the self-breathingaccelerating Bessel-like beams is established with amplitude modulated phase of zero-orderBessel-like beams. Its propagation property is studied in theoretically and experimentally.Based on the theory of zero-order Bessel-like beams, the Bessel-like Hermite-Gaussian optical beams are designed theoretically and experimentally. Following the similaraforementioned procedure, the vortex Bessel-like optical beams are synthesized. Thenondiffracting vortex center and invariant topological charge in the propagation aredemonstrated in the experiment. Based on the vortex Bessel-like beam, the self-acceleratingrotating beams are observed by employing the dynamic moire pattern. While theself-accelerating flower-like beams are demonstrated by the optical superposition method.All these intelligent beams own the non-diffracting, tunable trajectory and self-healingfeatures. They are demonstrated numerically and experimentally. The experimental resultsaccord with therical simulation very well.3. Explore the applications of zero-order Bessel-like beams and vortex Bessel-likebeams in micro manipulation and beam deflection of laser phased array. Theexperimental setup of the optical tweezer is established. The applications of the vortexBessel-like beams in nano partical trapping, rotating and transporting are demonstratedexperimentally. Based on the coherent combination theory, the autofocusing beam can besynthesized with multi zero-order Bessel-like beams theoretically and experimentally.Compared with Airy beam and Gaussian beam, these beams show its better focusing featureand its flexible controllable trajectory, which may be particularly attractive for beamsteering and scan in the far field.Based on the theoretical research and the demand of practical applications, the resultsof the thesis could attract potential practical applications in mirco manipulation and laserbeam steering.