small board for mounting photodiodes

The board does not have any apparent flow is clean and looks very good in black. (actually better for optical experiments) This board is designed to support three photodiodes and few optical components for splitting and polarizing laser light. Three photodiodes are part of a stabilization loop of low power HeNe lasers. Two of them are active part of the stabilization loop the third one acts as a beat detector for two frequencies lasers. It is particularly useful when doing interferemetry experiments. The design has a flow though that I discovered after placing the order. I will probably have to order this board again.