Fiber Coupled Diode Lasers are often used in situations where a precise beam delivery is required especially in compact configurations such as optical pumping of laser cavities. Such fiber delivery allows external positioning of the pump source and the associated cooling system, which often involves a bulky heatsink, a fan or water cooling system. The added benefit is the compact configuration with robust and thermally stable optical cavity packaging. The light output from the fiber is also quite homogeneous and circular which is best for optical pumping. Fiber Coupled Laser Diodes usually belong to one of the key types: vertical cavity surface-emitting lasers (VCSE), edge-emitting laser diodes and broad emitting laser diodes.