Energy measurement of high-repetition-rate pulsed laser
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摘要: 设计了一种用于高重复频率脉冲激光能量测量的峰值保持电路。电路由电荷积分器、2阶低通滤波器、时间延迟触发器和峰值保持器组成,通过将光电流脉冲转换成电压脉冲,电压脉冲的峰值与对应电流脉冲所包含的能量成正比。实验测量结果表明:该电路可以测量脉宽10 ns,重复频率2 kHz的重频窄脉冲激光的脉冲能量,且工作稳定,其线性动态范围140倍。该电路可应用于光电阵列探测系统中,能实现较高的空间分辨力。Abstract: A peak value hold circuit is developed for the energy measurement of a high-repetition-rate pulsed laser. The circuit consisting of four modules including a charge integrator, a 2nd-order Butterworth low-pass filter, a time-delay trigger and a peak-value-holder is designed to convert the photocurrent pulses to voltage pulses which are linear to the energies of incident pulse laser. The experimental measurement results indicate that this circuit is suitable for the pulsed laser with a width less than 10 ns and a repetition rate over 2 kHz. The results show that the circuit has a dynamic range about 140 times and works stably. It can be used to achieve a high spatial resolution in photodiode measurement systems.
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