Light power detecting device for laser beam in laser module, has adjusting device for continuous cross sectional variation of light path between two dispersive regions for adjusting light power

摘要

The device has a light dispersive device arranged upstream to a photodetector (40) e.g. photo diode, in a light path. The dispersive device comprises a light dispersive region arranged downstream of another light dispersive region in a light path. An adjusting device is provided for a continuous cross sectional variation of light path between the two dispersive regions for adjusting a light power, which is transmitted from the former dispersive region to the latter dispersive region. A light dispersive element and the photodetector are fastened at a holding element. Independent claims are also included for the following: (1) a method for adjusting a power of a light detected by a photodetector (2) a laser module comprising a photodetector.