Chaos Extreme Events and Optical Bistability of a Nd:YVO4 Laser

  • 何 國蔚

Student thesis: Doctoral Thesis


In this thesis we numerically and experimentally demonstrate the cavity-configuration-dependent (modulation-free) and pump-modulation-induced nonlinear dynamics of a Nd:YVO4(Neodymium-doped yttrium orthovanadate) laser system Operating at a certain range of pump powers and cavity lengths around the near-mode-degenerate cavity configuration chaos as well as extreme events (EEs) caused by the mode competition for the pump energy between the fundamental mode and transverse modes can be obtained without the addition of modulation signals Next with the addition of modulation signals we observed different dynamics with the modulation frequency (fm) tuned near and away from the relaxation oscillation frequency (fROF) of the system Chaos and EEs were obtained at a higher and same threshold of modulation depth (Pm) when fm is tuned away from fROF while chaos and EEs were obtained at lower but distinct thresholds when fm was tuned near fROF The dynamics were also analyzed through the route towards chaotic regime evolutions of EE ratio and positive Lyapunov exponents The resonance between fm and fROF can be observed through the amplitude ratio and phase difference evolution between the output and input signals under a low percentage of Pm with varying fm The resonance induced optical bistability when fm was tuned around fROF of the transverse modes at near-mode-degenerate cavity configuration while optical bistability was not observed at mode-degenerate cavity configuration
Date of Award2020
Original languageEnglish
SupervisorMing-Dar Wei (Supervisor)

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