激光二极管并联触发GaAs光电导开关特性研究

发布时间：2018-10-04 20:25

【摘要】：GaAs光电导开关(Photoconductive Semiconductor Switch-GaAs PCSS)是一种很有发展前景的脉冲功率器件。作为脉冲功率系统的核心器件,GaAs PCSS具有功率容量高、响应速度快、结构简单、低抖动和高重复频率等优点,因此,被广泛应用于冲击雷达、大电流点火装置、以及THz科学与技术等领域。为了实现触发光系统低成本、小型化、集成化,进一步提高开关输出电脉冲的幅值同时兼顾开关的寿命以及稳定性,本文采用激光二极管并联触发GaAs光电导开关。实验中为了提高开关并联输出电脉冲的同步性,两个激光二极管采用同一个驱动模块来驱动,在偏置电压1.2 kV触发光能1.91μJ时开关并联输出同步性达到了200.5 ps。并且在相同条件下进行了两路开关输出电脉冲的合成,与单个开关相比合成后电脉冲的幅值提高了1.86倍,而脉宽和上升沿并没有变差。对线性工作模式下开关并联输出电脉冲同步性进行了实验研究,结果表明:偏置电场一定时增加触发光能开关并联输出同步性呈变好趋势;触发光能一定时同步性随偏置电场变化呈Gaussian-like分布。同时,对影响GaAs光电导开关并联输出电脉冲同步性的因素进行了分析。模拟出GaAs材料中载流子稳态漂移速度随电场变化趋势与开关并联输出同步性随偏置电场变化趋势一致,基于对GaAs材料中载流子动态输运过程的分析给出了开关并联输出同步性变化的机理。
[Abstract]:GaAs photoconductive switch (Photoconductive Semiconductor Switch-GaAs PCSS) is a promising pulse power device. As the core device of pulse power system, PCSS has the advantages of high power capacity, high response speed, simple structure, low jitter and high repetition rate, so it is widely used in impulse radar and high current igniting device. And THz science and technology and other fields. In order to realize the low cost, miniaturization and integration of the trigger optical system, and to further improve the amplitude of the output electric pulse of the switch as well as the life and stability of the switch, a laser diode parallel triggering GaAs photoconductive switch is used in this paper. In order to improve the synchronicity of the parallel output electric pulse, the two laser diodes are driven by the same driving module. When the bias voltage is 1.2 kV to trigger the light energy of 1.91 渭 J, the synchronicity of the parallel output of the switch is up to 200.5 ps.. Under the same conditions, the two-way switch output electric pulse is synthesized. Compared with a single switch, the pulse amplitude is increased by 1.86 times, but the pulse width and rising edge are not changed. The synchronicity of parallel output electric pulse in linear mode is studied experimentally. The results show that when the bias electric field is fixed, the synchronicity of parallel output of trigger light energy switch becomes better. When the light energy is triggered, the synchronism changes with the bias electric field in Gaussian-like distribution. At the same time, the factors that affect the synchronicity of parallel output electric pulse of GaAs photoconductive switch are analyzed. It is simulated that the steady drift velocity of carrier in GaAs is the same as the synchronicity of switch parallel output with bias electric field. Based on the analysis of the dynamic transport process of carriers in GaAs materials, the mechanism of synchronous variation of switch parallel output is given.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM564

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