Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A random laser is a laser that uses a highly disordered gain media. A random laser uses no optical cavity but the remaining principles of operation remain the same as for a conventional laser. Random laser action has been observed in many different media, including semiconductor powder, nanostructured and non-nanostructured thin films, laser dyes, ceramics and many more. Developments in nanoparticles have demonstrated large amounts of optical scattering can occur when photons are incident. In this way, light can be diffused around a medium in much the same way as it is on white paint and in clouds. If nano particles are embedded in an optical gain medium, for example, zinc oxide (UV emission - bandgap 3.3 eV), light from a pump source ( e.g. frequency-tripled Nd:YAG laser) will induce spontaneous emission of light at around 350 nm within the gain medium.

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