The power and efficiency of terahertz radiation (THz) in a rippled density plasma by dark hollow laser beams are very small due to the collisional effect. We show that when a magnetic field is applied perpendicularly to the plasma, the THz radiation power and efficiency significantly enhance. Also, the magnetic field changes the THz radiation profile to a profile similar to a dark hollow laser beam. The mutual effect between the laser beams and THz radiation in plasma, which is important in high energy transfer between laser beams and THz radiation, is taken into account. We find that the maximum efficiency obtained in our scheme is more than four orders of magnitude greater than the efficiency in the absence of magnetic field.

由于碰撞效应，暗中空激光束在波纹密度等离子体中的太赫兹辐射（THz）的功率和效率非常小。我们表明，当垂直于等离子体施加磁场时，太赫兹辐射功率和效率会大大提高。同样，磁场将太赫兹辐射轮廓改变为类似于暗空心激光束的轮廓。考虑到激光束与等离子体中太赫兹辐射之间的相互作用，这在激光束与太赫兹辐射之间的高能量传递中很重要。我们发现，在我们的方案中获得的最大效率比没有磁场时的效率高出四个数量级。