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In this thesis, we describe the development of a time-domain terahertz (THz) spectrometer driven by two different laser sources: an Er-doped femtosecond fiber laser and a mode-locked Ti:Sapphire laser. The resulting THz electromagnetic radiation was generated and detected using photoconductive antenna detection methods in both systems. In these experiments we characterized the THz power output for both the fiber laser driven system and the Ti:Sapphire laser driven system. We calculated the THz power output using two different methods. By using the Hertzian Dipole method we estimated the generated THz power after the generation photoconductive antenna. Using this method, we showed that the generated power is on the order of milliwatts, which is far larger than the expected power typical for these systems. The second, "Open-Circuit Voltage" method, allowed us to calculate the received power on the detection photoconductive antenna. Using this method we were able to show that the THz power generated and detected in these systems is on the order of microwatts.