LIGHT MONITORING DEVICE

摘要

A monitoring device for monitoring a light beam comprises a beam splitter, a photodetector and an electrical conductor member, wherein the photodetector and the electrical conductor member are located directly or indirectly on the beam splitter, and the electrical conductor member is electrically connected to the photodetector. The electrical conductor member may be a conductive track on the beam splitter or it may be a tile or other substrate carrying a conductive track or other electrical conductor. The monitoring device may be a wavelength locker for a laser.