Abstract
By using a wavelength-tunable near-infrared femtosecond laser, we demonstrate a wavelength scaling mechanism in which the efficiency of terahertz (THz) radiation production by Rb and Cs vapor plasmas increases with increasing excitation laser wavelength. Due to the low ionization energies of alkali metals, the THz radiation energy generated by Cs is an order of magnitude higher than that produced N2 at a wavelength of 1500 nm. The experimental results are well explained by the model of photocurrent as being induced by electron tunneling ionization.
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