Coherent and incoherent electromagnetic radiation emitted from audchannel-guided laser wakefield accelerator (LWFA) is calculated based on theudLienard–Wiechert potentials. It is found that at wavelengths longer than theudbunch length, the radiation is coherent. The coherent radiation, which typicallyudlies in the infrared range, shows features that reveal details of the acceleration process and properties of the electron bunch, such as its duration, charge, energy, and offset with respect to the wakefield axis. It is found that the LWFA emits energy predominantly in the coherent range of frequencies. The incoherent range of the spectrum, which extends to the x-ray frequency range, consists of rather broad peaks caused by the acceleration. The radiated energy, power and the pulse duration are estimated.
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