A diode pumped, multi axial mode, intracavity frequency doubled laser resonator has high amplitude stability, meaning that the percent root mean square noise (% RMS) of the doubled output beam power is low. A diode pump source (28) supplies a pump beam to a laser crystal (22) positioned in a resonator cavity and produces a multi axial mode infrared beam that is incident on a doubling crystal (36), also positioned in the resonator. A frequency doubled output beam is produced that has an RMS of less than 3 %. The laser is highly efficient, provides high output power and its output beam is of high spatial quality.