Bright High-Harmonic Generation through Coherent Synchrotron Emission Based on the Polarization Gating Scheme

Figure 1

(a) Schematic of intense extreme ultraviolet pulse generation with polarization gating scheme, which consists of two counter-rotating circularly polarized (CP) laser pulses normally incident on a solid target. These collinear left and right CP laser pulses create a linear gate in the middle portion. (b) Illustration of the electron density profiles when the front CP laser part irradiates the target. The preplasma is compressed and an ultra-dense electron nanobunch is formed. (c) When the linear polarization of the laser reaches the target surface, the dense electron nanobunch is accelerated by the charge-separation and laser electric field to relativistic velocities in a half laser cycle; thus, intense extreme ultraviolet pulses would be emitted.

(a)

(b)

(c)