Laser heater based on transverse gradient undulator

The utility model provides a laser heater based on a transverse gradient undulator, which is arranged in a free electron laser device and a linear accelerator. The device comprises a first reflecting mirror, a first laser target sheet, a first beam target sheet, a transverse gradient undulator, a second laser target sheet, a second beam target sheet and a second reflecting mirror which are sequentially arranged along a laser light path and are positioned on a horizontal first optical axis, and four deflection magnets which are sequentially arranged along a track of an electron beam, the second deflection magnet is arranged between the first reflecting mirror and the first laser target piece, the third deflection magnet is arranged between the second beam target piece and the second reflecting mirror, the outlet magnetic center of the second deflection magnet and the inlet magnetic center of the third deflection magnet are located on the first optical axis, and the connecting line of the outlet magnetic center