Chaotic Dynamics And Phase Locking Of Self-organized Doped-insulator Laser Arrays

Achieving high-power lasers with good beam-quality is a challenging goal of laser technology and drives the development of laser technology. Nowadays, coherent beam combining of self-organized doped-insulator laser array is considered as a promising way to realize the challenging goal. This sort of arrays can make elementary phase locked without any additional phase control. This phenomenon is considered as self-organization, and attaches much attention. Furthermore, self-organized laser array is also a representative paradigm of coupled nonlinear oscillator systems. Thus, the studies on the dynamics of this array are very necessary and useful for deeply understanding the dynamical characteristics of coupled nonlinear oscillator systems. Besides that, since the synchronized chaos was discovered in self-organized doped-insulator laser array, chaotic dynamics of this array becomes another attractive point for its application in secure communication. In one word, nowadays, self-organized doped-insulator laser array is one front-edge topic of laser physics.Although many studies have been carried out on the self-organized doped-insulator laser array, understandings are still limited on the physical mechanisms of frequency-modulated chaos and self-organized phase locking of this array. Therefore, the interests of this dissertation are focused on these two points, and the contents of this dissertation are given as follows:1. The chaotic dynamics of the self-organized doped-insulator laser array with frequency modulation is numerically studied. By analysis the relationship between the chaotic dynamics and the frequency modulation, the mechanism of the chaotic response to the frequency modulation is revealed. The effects of parameters of the array (e.g., coupling coefficient, pump and so on) on the chaotic response are also numerically discussed.2. A theoretical model is built based on the semiclassical laser theory corresponding to the configuration properties of the interferometric laser array and mutually-injected laser array. This model can make a detailed description on the propagating of laser fields in these arrays, and provide a useful tool to analyze phase locking of these self-organized laser arrays.3. The physical mechanism of self-organized phase locking of the interferometric laser arrays is theoretically studied. The effect of gain on the phase-locked states of the array is discussed. The validity of the cold-cavity analysis for predicting the performance of the array is also verified. Furthermore, the effects of the configuration of the compound resonator on phase locking of the interferometric array are investigated with circulating field theory (a kind of cold-cavity analysis). The effects of polarization controlling on coherent beam combining of the interferometric arrays are also researched experimentally.4. Phase locking of mutually-injected laser array is theoretically studied. The mechanism of self-organization phase locking of this array is revealed, and the phase-locked states of the array are also given. Besides that, the effects of mutual-injection ways on phase locking of arrays of two mutually-injected lasers are also theoretical investigated. The relationship between the phase-locked states and the number of elementary lasers of the array is also given.