The invention discloses a method and a device for generating elliptically polarized attosecond pulses. A double-color
laser field obtained by superposing the linearly polarized
laser and the circularly polarized
laser interacts with polar gas molecules, and an
electric field parameter of the double-color laser field is calculated and adjusted by utilizing a three-dimensional time-containing schrodinger equation, so that the interaction generates higher
harmonics; by adjusting the
intensity ratio of the double-color laser field, the generated higher
harmonics have the
ellipsometry rate larger than the preset
ellipsometry rate value in the
cut-off region; and the higher
harmonics with the
ellipsometry rate larger than the preset ellipsometry rate value are synthesized into the
attosecond pulse, and the ellipsometry rate of the
attosecond pulse is regulated and controlled by adjusting the
relative phase of the double-color laser field. According to the invention, high enough
harmonic efficiency is ensured, and then elliptically polarized
harmonic waves in a
cut-off region are synthesized into high-efficiency elliptically polarized isolated attosecond pulses. Besides, the method can realize regulation and control of the rotatability and ellipsometry rate of the isolated
attosecond pulse by adjusting the
relative phase of the double-color field, and is a practical method for generating and adjusting the ellipsometry isolated attosecond pulse.