The femtosecond laser can form a plasma in the air, and broadband terahertz radiation is formed in the plasma due to the oscillation of positive and negative charges. We know that there are two main frequencies involved. One is the oscillation frequency of the plasma and the other is the peak frequency of the terahertz spectrum. The usual study considers the peak frequency of terahertz to be the intrinsic oscillation frequency of the plasma. Is the oscillation frequency of the plasma and the peak frequency of the terahertz really equal? What are the main factors determining the peak frequency of the terahertz spectrum?
The paper given below will be helpful to you.
Article Control of peaks of terahertz radiation and tuning of its fr...
Have a look at these articles too.
a)
https://core.ac.uk/download/pdf/43097244.pdf.
b) Article Investigation of Terahertz Peak Frequencies From GaAs Photoc...
c)
https://arxiv.org/pdf/1806.00735
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