Fibre Pigtailed 520 nm Laser Diodes
PD-LD has successfully coupled 5 mW of green light from a 520 nm laser diode into a tiny 2.2 µm core diameter fibre. Naturally it is a challenge to achieve good coupling efficiency with 2.2 µm core fibre. However, for many applications a true single-mode beam is a priority. Applications for such a device would be for alignment of IR laser systems such as CO2 and Nd:YAG systems often as an alternative to red alignment lasers, appearing multiple times brighter to the human eye whilst ensuring eye safety.
