Semiconductor laser module

Details Semiconductor laser module Semiconductor laser module

H - Electricity

01

S

H01S 5/00 (2006.01) H01S 5/022 (2006.01) H01S 5/02 (2006.01)

Patent

CA 2447242

A laser module comprises a laser diode secured on a semiconductor substrate for emission of a forward laser beam from its front end and a backward laser beam from a point source on its rear end in a horizontal direction. A photodiode, also secured on the substrate, has a light receiving surface extending in the horizontal direction by length L from an edge proximate to the laser diode for receiving a lower half of the backward laser beam, the light receiving surface being lower than the point source by a vertical distance Y, the edge being spaced a horizontal distance Z from the point source of the laser diode, wherein the horizontal distance Z is equal to or greater than (Y/ tan .theta.) - L, where .theta. is a vertical angle in which the lower half of the backward laser beam radiates from the point source.

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