A laser scanning projection system for use in illuminating a waveguide of an augmented reality or virtual reality headset, the system comprising: a laser source, configured to emit light; a first polarising beam splitter, configured to receive the light from the laser source; a first quarter waveplate, configured to receive the light from the first polarising beam splitter; a laser scanner comprising a scanning mirror that is pivotably mounted, configured to receive the light from the first quarter waveplate and direct the light across an angular field of view, thereby to form an exit pupil; a second polarising beam splitter, the second polarising beam splitter configured to receive the light from the laser scanner, via the first quarter waveplate and the first polarising beam splitter; a second quarter waveplate, arranged at a first face of the second polarising beam splitter, configured to receive the light from the second polarising beam splitter; a first mirror arranged at the first face of the second polarising beam splitter, the first mirror configured to receive the light from the second polarising beam splitter via the second quarter waveplate, and to reflect the light towards the second polarising beam splitter via the second quarter waveplate; a third quarter waveplate, arranged at a second face of the second polarising beam splitter configured to receive the light from the second polarising beam splitter; a second mirror arranged at the second face of the second polarising beam splitter, the second mirror configured to receive the light from the second polarising beam splitter via the third quarter waveplate after having being reflected by the first mirror, the second mirror configured to reflect the light towards the second polarising beam splitter via the third quarter waveplate; a fourth quarter waveplate, arranged at a third face of the second polarising beam splitter, configured to receive the light from the second polarising beam splitter; a third mirror arranged at the third face of the second polarising beam splitter, the third mirror configured to receive the light from the second polarising beam splitter via the fourth quarter waveplate after having being reflected by the second mirror, the third mirror configured to reflect the light towards the second polarising beam splitter via the fourth quarter waveplate; a waveguide comprising an input, the input configured to receive the light from the first polarising beam splitter via the second polarising beam splitter after having been reflected by the third mirror such that the exit pupil formed at the laser scanner is relayed into the waveguide. a laser source, configured to emit light; a first polarising beam splitter, configured to receive the light from the laser source; a first quarter waveplate, configured to receive the light from the first polarising beam splitter; a laser scanner comprising a scanning mirror that is pivotably mounted, configured to receive the light from the first quarter waveplate and direct the light across an angular field of view, thereby to form an exit pupil; a second polarising beam splitter, the second polarising beam splitter configured to receive the light from the laser scanner, via the first quarter waveplate and the first polarising beam splitter; a second quarter waveplate, arranged at a first face of the second polarising beam splitter, configured to receive the light from the second polarising beam splitter; a first mirror arranged at the first face of the second polarising beam splitter, the first mirror configured to receive the light from the second polarising beam splitter via the second quarter waveplate, and to reflect the light towards the second polarising beam splitter via the second quarter waveplate; a third quarter waveplate, arranged at a second face of the second polarising beam splitter configured to receive the light from the second polarising beam splitter; a second mirror arranged at the second face of the second polarising beam splitter, the second mirror configured to receive the light from the second polarising beam splitter via the third quarter waveplate after having being reflected by the first mirror, the second mirror configured to reflect the light towards the second polarising beam splitter via the third quarter waveplate; a fourth quarter waveplate, arranged at a third face of the second polarising beam splitter, configured to receive the light from the second polarising beam splitter; a third mirror arranged at the third face of the second polarising beam splitter, the third mirror configured to receive the light from the second polarising beam splitter via the fourth quarter waveplate after having being reflected by the second mirror, the third mirror configured to reflect the light towards the second polarising beam splitter via the fourth quarter waveplate; a waveguide comprising an input, the input configured to receive the light from the first polarising beam splitter via the second polarising beam splitter after having been reflected by the third mirror such that the exit pupil formed at the laser scanner is relayed into the waveguide.