With The Rapid Development of Ultra-short And Strong Laser Pointer Technology

Therefore, it is very important to detect and determine the phase of the laser pointer pulse carrier in advance for the subsequent research on strong field QED. Currently, under the relativistic laser electromagnetic field strength. The carrier phase of the ultrashort laser pulse (within 2 wavelengths) can be determined by the radiation angular spectrum distribution and the radiation cross section of the "Breit-Wheeler" generation process. However, the pulse lengths of existing and under construction PW laser pulses are all above 15 to 30 femtoseconds (4 to 10 wavelengths). Even the beam splitting method is used to reduce the laser pulse intensity to a non-relativistic level. And does not consider the ideal case of carrier phase information damage. Non-relativistic laser pulse carrier phase detection methods (for example: stereo-ATI, frequency-doubled interference, etc.) are also mainly applicable to laser pulses with small cycles. Recently, Professor Li Jianxing, Institute of Laser and Particle Beam Science and Technology, Xi'an Jiaotong University, and Christoph H. Max Planck Institute for Nuclear Physics, Germany. Professor Keitel's team collaborated and discovered for the first time that the use of ultra-long laser pulses (6 to 10 wavelengths and longer) and relativistic electron beams collided, and the electrons' back radiation spectrum produced two X-ray peaks. Its intensity and corresponding polarization angle distribution are very sensitive to the carrier phase of the driving laser pulse. And change linearly and monotonically. This change can be used as a basis for determining the phase of the pulse carrier that drives the PW long laser pointers.

2020-01-10 03:14:09