Compact GaN based sources for atomic cooling

We present recent results on compact GaN based laser sources, primarily designed for cooling and trapping atoms and ions. We show various designs used for miniaturised, direct-generation laser sources in the UV-green part of the spectrum targeting multiple atomic species. We show results from a line narrowed 369nm ECDL for Yb+ cooling, a 397nm frequency stabilised source for Ca+ cooling and a 422nm butterfly packaged ECDL for Sr+ cooling.