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Efficient THz generation by Hermite-cosh-Gaussian lasers in plasma with slanting density modulation

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Abstract

Terahertz (THz) has emerged as a significant field of study because to its extensive practical applications in various domains such as medical diagnosis, remote sensing, defence, and short-range wireless communication, among others. Numerous endeavours have been undertaken to achieve a tuneable and energy-efficient terahertz (THz) source. This study examines the co-propagation of two Hermite-cosh-Gaussian laser pulses within an underdense plasma medium characterized by a slanting up density profile. The interaction between laser and plasma exhibits nonlinear characteristics, leading to the creation of THz radiation with high efficiency. An analytical study is conducted to examine the relationship between the conversion efficiency of terahertz (THz) waves and characteristics such as plasma frequency, Hermite polynomial mode index (s), decentred parameter (b), and electron collisional frequency (\({\gamma }_{\mathrm{en}}\)). The results show that as we move in off-resonant direction, THz conversion efficiency decreases and becomes almost zero for normalized THz frequency and normalized collisional frequency values \(>1.6\) and \(>4\), respectively. THz conversion efficiency increases with increase in Hermite polynomial mode index values for \(s=\mathrm{0,1},2\). The suggested method is particularly useful for producing high intensity, tuneable, energy-efficient THz radiation source by adjusting the value of decentred parameter and Hermite polynomial mode index values.

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Data availability

The data that support the findings of this study are available from the corresponding authors upon reasonable request.

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Authors and Affiliations

  1. Department of Physics, Lovely Professional University, G.T. Road, Phagwara, Punjab, 144411, India

    Hitesh Kumar Midha, Vivek Sharma & Vishal Thakur

  2. Department of Physics, University of Allahabad, Prayagraj, Uttar Pradesh, India

    Niti Kant

Authors
  1. Hitesh Kumar Midha
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  2. Vivek Sharma
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  3. Niti Kant
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  4. Vishal Thakur
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Contributions

HKM contributed to derivation, methodology, analytical modelling, and graph plotting; VS contributed to numerical analysis; NK contributed to numerical analysis and result discussion; and VT contributed to supervision, reviewing, and editing.

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Correspondence to Vishal Thakur.

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Midha, H.K., Sharma, V., Kant, N. et al. Efficient THz generation by Hermite-cosh-Gaussian lasers in plasma with slanting density modulation. J Opt (2023). https://doi.org/10.1007/s12596-023-01413-5

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  • DOI: https://doi.org/10.1007/s12596-023-01413-5

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