On the design of neodymium miniature lasers

A general approach to an optimum design of miniature Nd lasers is described. Operation at 1.05 as well as 1.32 μm is considered. Maximum power output is the main criterion, and the consequences on the choice of material, neodymium concentration, laser dimensions, and pumping scheme are deduced. As an illustration, the design procedure and functioning of an Nd-pentaphosphate laser side-pumped by LED arrays are described. Pulsed operation is obtained with the laser crystal held at -13.5°C, and CW operation is possible below -49°C, the planar LED arrays being held at room temperature.