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Advancements in laser technology have dramatically expanded the applications of lasers to particle accelerators. Today, lasers have been used for accelerators in a broad range from operational systems such as nonintrusive particle beam diagnostics instruments, to elaborate applications with high technical readiness levels including, for instance, photoinjectors, a laser assisted foil-less charge exchange injection scheme and Compton scattering-based light sources, and finally to exotic topics such as laser driven electron/ion accelerators. This talk reviews recent experimental results achieved in the above applications, their requirements on laser parameters and challenges that require future laser technology development. Important technical elements such as the femto-second pulse generation, the burst-mode optical amplifiers, the beam combining from laser arrays, and the power enhancement optical cavity will be briefly described.
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