Abstract-Fiber-based pulse stretcher for narrowband terahertz pulse generation with a chirped-pulse beating method

Tetsuya Yoshida¹, Shohei Kamada¹, Shuhei Murata¹, andTakao Aoki^{1,2
http://apl.aip.org/resource/1/applab/v103/i15/p151118_s1?isAuthorized=no}

We theoretically show that it is possible to generate chirp-free terahertz (THz) pulses with a chirped-pulse beating method by using an optical fiber as a pulse stretcher. Proper choices of the core radius and the dopant fraction of the core material of a step-index single-mode optical fiber eliminate the third-order spectral phase of the fiber, thus giving the pump laser pulse a purely linear chirp. We also show that even a standard commercial single-mode optical fiber can give THz pulses of lower chirp than the lower limit for a grating pair. We perform experiments to verify our theory.

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