Excitation of the Laser wakefield by asymmetric chirped laser pulse in under dense plasma

Charge particles can be accelerated to extremely high energies through a phenomenon called laser wakefield acceleration. The wakefield produced by such accelerators depends on several laser and plasma characteristics. The asymmetry in the frequency chirped laser pulses we employed in this study is created by altering the pulse rise and fall times. Longitudinal wakefield and wake potential produced by asymmetric positive chirped pulses (APCP), asymmetric negative chirped pulses, (ANCP) and asymmetric unchirped pulses (AUCP) are estimated for different pulse rise and fall lengths. The curves created are used to compare the results. Findings suggest that the pulse rising time plays a significant role in wakefield generation. APCP with a shorter rise length is more effective than one with a longer rise length. Furthermore, compared to NPCP, APCP can significantly improve wakefield for a given rise length. For laser pulses with unusually long rise times, frequency chirping has no discernible effect on wakefield formation. The wakefield rises with decreasing pulse rise length (increasing pulse fall length) for the same chirp and pulse length. Wakefield rises with an increase in the positive chirp parameter b and drops with an increase in the negative chirp for the same pulse rise duration. This study has practical implications for researchers seeking to identify an optimal laser pulse for generating laser-plasma interaction that is both effective and energy efficient.