A high-power fiber optic laser Doppler velocimeter

A fibre optic Doppler difference type laser velocimeter for use with high optical powers has been devised and constructed. The system provides a flexible monomode optical fibre link between the argon ion laser used and the launching optical system, which illuminates the measurement volume. A multimode optical fibre links the receiving optical system and the photodetector. Optical powers of up to 500 mW were delivered to the measurement volume.