The production of broadband,terawatt terahertz(THz) pulses has been demonstrated by irradiating relativistic lasers on solid targets.However,the generation of extremely powerful,narrow-band and frequency-tunable THz p...The production of broadband,terawatt terahertz(THz) pulses has been demonstrated by irradiating relativistic lasers on solid targets.However,the generation of extremely powerful,narrow-band and frequency-tunable THz pulses remains a challenge.Here,we present a novel approach for such THz pulses,in which a plasma wiggler is elaborated by a table-top laser and a near-critical density plasma.In such a wiggler,the laser-accelerated electrons emit THz radiations with a period closely related to the plasma thickness.The theoretical model and numerical simulations predict that a THz pulse with a laser-THz energy conversion of over 2.0%,an ultra-strong field exceeding 80 GV/m,a divergence angle of approximately 200 and a center frequency tunable from 4.4 to 1.5 THz can be generated from a laser of 430 mJ.Furthermore,we demonstrate that this method can work across a wide range of laser and plasma parameters,offering potential for future applications with extremely powerful THz pulses.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.11921006 and 12175058)Beijing Distinguished Young Scientist Program and National Grand Instrument Project(Grant No.SQ2019YFF01014400)in part funded by UK EPSRC(Grant Nos.EP/G054950/1,EP/G056803/1,EP/G055165/1 and EP/M022463/1).
文摘The production of broadband,terawatt terahertz(THz) pulses has been demonstrated by irradiating relativistic lasers on solid targets.However,the generation of extremely powerful,narrow-band and frequency-tunable THz pulses remains a challenge.Here,we present a novel approach for such THz pulses,in which a plasma wiggler is elaborated by a table-top laser and a near-critical density plasma.In such a wiggler,the laser-accelerated electrons emit THz radiations with a period closely related to the plasma thickness.The theoretical model and numerical simulations predict that a THz pulse with a laser-THz energy conversion of over 2.0%,an ultra-strong field exceeding 80 GV/m,a divergence angle of approximately 200 and a center frequency tunable from 4.4 to 1.5 THz can be generated from a laser of 430 mJ.Furthermore,we demonstrate that this method can work across a wide range of laser and plasma parameters,offering potential for future applications with extremely powerful THz pulses.
