Abstract
The dependence of the terahertz energy generated by two-color femtosecond ionizing pulses on intensities of both one-color components is studied. The numerical calculations are supported with analytical formulas which help to reveal the nature of these dependences. The optimal intensity ratios in the cases when the frequency ratios in two-color pulse are equal to 2, 3/2 and 4 are found.
Highlights
Sources of intense broadband terahertz (THz) radiation attract much interest due to various applications: time-domain spectroscopy, remote sensing, terahertz imaging and others [1,2,3]
To find the optimal intensity ratio with a fixed sum of intensities IS = I1 + I2, we introduce the p parameter μ = I2 /IS ∈ [0, 1], from which the field amplitudes are E2 = μE and E1 = 1 − μE, where
If we fix the sum of intensities of the components Is, as has been done for the induced multiwave mixing (IMWM)
Summary
Sources of intense broadband terahertz (THz) radiation attract much interest due to various applications: time-domain spectroscopy, remote sensing, terahertz imaging and others [1,2,3]. A recently discovered possibility of efficient generation of THz radiation with the use of the ionizing two-color pulses with frequency ratios other than 2 [9,10] opened up wide space for research of the optimal parameters of such pulses. These ratios can be equal to any rational fraction a/b with a small odd sum of numerator and denominator, such as 3/2, 4/1 and others.
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