To solve the problem above, a terahertz time-domain spectroscopy system based on asynchronous sampling is designed in this thesis. The system is based of two femtosecond laser whose repetition frequency is 100MHz.In order to realize asynchronous sampling, the control circuit of the two lasers is the most important. This thesis focuses on the researching, designing and experiment of this circuit. Firstly, the circuit is designed overall. Then the selection of the key device and the designing of the circuit principle is done by myself. Secondly, the test of the circuit to phase locked the master and slave fiber femtosecond lasers has been done. As a result, the two lasers can phase locked on two repetition frequencies with a small frequency difference calculated by the circuit.
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Ruike Wang, Mile Zhang, Yihan Li, Jingsuo He, Cunlin Zhang, Hailin Cui, "The design of circuit for THz time domain spectroscopy system based on asynchronous optical sampling," Proc. SPIE 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV, 1003027 (3 November 2016);