We will report on our development and application of a terahertz (THz) time-domain spectrometer employing asynchronous optical sampling (ASOPS) between two commercial Ti:Sapphire lasers operating with a repetition rate of approximately 80 MHz, and a THz frequency resolution approaching the limit of that repetition rate. Time-domain terahertz spectrometers are often based on scanning mechanical delay stages; yielding a practically feasible resolution limit of several GHz. There are commercially available THz time-domain spectrometers employing ASOPS with GHz repetition rate lasers; they achieve 1 GHz resolution. The use of our lower repetition rate lasers, while introducing technical challenges, offers a theoretical resolution limit of approximately 80 MHz. Applications to be presented include the rotational spectrum of water as a demonstration of instrument performance, as well as spectra of pseudorotational modes in THF and long-delay THz emission measurements of coherent spin precession lifetimes of THz-pumped magnons in candidate spintronics materials.

Development and application of a 100 MHz-resolution terahertz time-domain spectrometer

245th National Meeting (2013)

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