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For the laser wakefield acceleration, suppression of beam energy spread whilekeeping sufficient charge is one of the key challenges. In order to achievethis, we propose bichromatic laser ionization injection with combined laserwavelengths of $2.4\rm \mu m$ and $0.8\rm \mu m$ for wakefield excitation andfor triggering electron injection via field ionization, respectively. A laserpulse at $2.4\rm \mu m$ wavelength enables one to drive an intense accelerationstructure with relatively low laser power. To further reduce the requirement oflaser power, we also propose to use carbon dioxide as the working gas medium,where carbon acts as the injection element. Our full three dimensionalparticle-in-cell simulations show that electron beams at the GeV energy levelwith both low energy spreads (around one percent) and high charges (severaltens of picocoulomb) can be obtained by this scheme with laser parametersachievable in the near future.

High quality electron beam acceleration by ionization injection in laser wakefields with mid-infrared dual-color lasers