Second harmonic generation of cosh-Gaussian laser beam in magnetized plasma
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Second harmonic generation of cosh‑Gaussian laser beam in magnetized plasma Vinay Sharma1 · Vishal Thakur1 · Niti Kant1 Received: 7 May 2020 / Accepted: 17 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In the present paper, second harmonic generation (SHG) of cosh-Gaussian laser in a magnetized plasma is analyzed. During laser propagation through plasma, electrons acquire the oscillatory velocity and result density perturbation. The density oscillations beat with the oscillatory velocity to produce second harmonic current which drives SHG. Wiggler magnetic field adds the additional momentum to the photons of second harmonic and fulfills the phase matching condition which results in resonant SHG. Wiggler magnetic field also helps to maintain the cyclotron frequency due to which plasma electrons remain confined within the plasma region and results SHG of higher efficiency. Using paraxial approximation, we have derived the equation for the amplitude of SHG and studied its variation for different values of intensity parameter of incident laser, wiggler magnetic field, decentered parameter and plasma density. The efficiency of SHG is significant at higher values of intensity of incident laser, wiggler field, and plasma density as observed in our analysis. Keywords SHG · Cosh-Gaussian laser · Decentered parameter · Wiggler magnetic field · Plasma
1 Introduction Short pulse laser propagating through plasma results harmonic generation. Due to their wide range of applications, harmonic generations, has created great interest amongst the different workers. Amongst different harmonic generations the second harmonic generation (SHG) have specific importance due to its application, such as microscopic resonance imaging (Chen et al. 2012; Tilbury and Campagnola 2015; Cicchi and Pavone 2017), in medical science (Natal et al. 2018), to probe different surface (Brixius et al. 2018), in optoelectronics (Gan et al. 2018), to probe molecular structure(Nucciotti et al. 2010) etc. Various workers had investigated SHG for different applications and under different conditions. Nahata and Heinz (1996) applied the SHG to measure ultrafast electrical signals due to sensitivity of second harmonic pulse for electric field. Balnc * Niti Kant [email protected] 1
Department of Physics, Lovely Professional University, G.T. Road, Phagwara, Punjab 144411, India
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et al. (1997) studied the material structure using SHG and applied the study for aluminum nitride thin films and their theoretical results are very close to the experimental results. Marrucci et al. (2002) optically analyzed the surfaces by SHG, having their wide applications in lubricant industry. They investigated the absorption by solid surface from liquid medium. Campagnola (2011) used the SHG for microscopic imaging for disease diagnostics. Microscopic imaging completely describes the chemical and physical properties, and is a very useful tool for the diagnosis of brain
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