Abstract

For a typical laser diode bar, in slow axis plane its length is 10mm and the divergent angle is about 10°, while in fast axis plane the width is about 1 μm and the divergent angle is about 30° ~ 50°.So when LD acts as a pumping source, a coupling system is necessary to deliver the pumping light into laser rod. Coupling method currently adopted include: aspheric lens series^[1], gradient index lens^[2], optical fiber^[3] and directly^[4] coupling. But their efficiencies are normally lower. A new type of coupling system—lens duct^[5,6,7] was used in recent years , we optimized its parameters with geometry optical method.

© 1997 Optical Society of America