Tunable diffraction-limited light at 488 nm by single-pass frequency doubling of a broad area diode laser

摘要

A laser system that is based on second-harmonic generation of a broad area laser diode and provides 23.2 mW of diffraction-limited light with narrow bandwidth is described. It is tunable from 487.4 to 489 nm. The broad area laser diode is frequency stabilized in an external cavity that yields 800 mW of diffraction-limited light. This infrared light is converted into the visible by use of a 1 cm periodically poled MgO:LiNbO_3 bulk crystal with a measured single-pass conversion efficiency of up to 3.6%/W x cm.