The most advanced systems for AR/VR displays use laser light sources that are projected onto glasses, relayed through waveguides, or even directly projected onto your eye. Such laser-based systems are very compact, have a good brightness, and consume little power. However, due to the strong coherence of the laser source, this might result in unwanted interference patterns, so-called speckle, in the projected image. In this project we will investigate speckle-reduction methods by integrating a fast modulator alongside a laser on a silicon photonic chip, enabled by recent advances in the field of integrated photonics and heterogeneous integration. On a Silicon Nitride platform, an external cavity laser will be created with a high-speed lithium niobate (LN) modulator. This is not only a power-efficient, but also ultra-compact solution to reduce the temporal coherence and reduce speckle noise.