基于LabVIEW的低噪聲超快泵浦-探測系統(tǒng)開發(fā)及應用
[Abstract]:Ultra-fast pump-detection system can distinguish the change process of things in femtosecond order of magnitude. It has important applications in physics, biology, chemistry and medicine. It is necessary to change the optical path difference between the pump light and the probe light hundreds of times in the ultra-fast pumping-detection experiment and to record the power of the detection light corresponding to the optical path difference. Tedious data recording and optical path difference control are difficult to be accomplished manually. Therefore, automatic control system is the key to its application. In addition, the laser source used in the ultra-fast pump-probe system is usually jitter, which results in a low SNR of the measured results. How to obtain high SNR detection signal is also the key technology of pump-detection. This paper focuses on the design and construction of a low-noise ultra-fast pump-probe automatic control system. Based on Lab VIEW, the ultra-fast pump-probe automatic measurement system is developed, and the signal-to-noise ratio (SNR) characteristics of the system are studied in combination with the phase-locked amplifier. The main work of this paper is as follows: (1) based on the Lab VIEW virtual instrument development platform, an automatic control software for ultra-fast pumping and detection is designed. The software realizes the automatic control of the system and the automatic collection of data by means of the RS232 and GPIB protocol to control the instrument in the measuring system. Moreover, the automatic control software can map the measurement data in real time, which reduces the workload of the pump-detection experiment system. (2) combining the optical chopper and the phase-locked amplifier, a low-noise ultra-fast pump-detection system is built. In an ultra-fast pump-probe system, a chopper is used to modulate the laser to a specific frequency. The chopper output signal is input to the phase-locked amplifier as the reference signal. The phase-locked amplifier only detects the same component of the measured signal as the reference signal frequency, while the other frequency components are greatly suppressed. If the laser power is measured directly by the power meter, the variance is 0.0001, and when the integral time constant is set to 3 s, the variance is 0.000006 when the phase-locked amplifier is used to measure the laser power. The effectiveness of the proposed noise reduction method is verified by testing the ultra-fast kinetic characteristics of carbon disulfide by ultra-fast pump detection system.
【學位授予單位】:湖南大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TP311.52;TN722;TN24
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