Patent ID: 8644357
Filing Date: 2014-02-04
Classification: H01S

Abstract:
1. An optical module or subassembly thereof, comprising: a laser chip which includes a low CTE and which includes a bottom surface; a submount member which has high thermal conductivity and a low CTE that substantially matches the low CTE of the laser chip and which has a top surface which is secured to the bottom surface of the laser chip; a CTE matched spacer member which comprises a CTE that substantially matches the CTE of the submount member, high thermal conductivity, a bottom surface and a top surface which is secured to a bottom surface of the submount; a housing base member which comprises high thermal conductivity, a bottom surface that forms an outer boundary of a bottom portion of the module, a material including a high thermal conductivity and a high CTE and a top surface which is secured to the bottom surface of the CTE matched spacer member; and at least one layer of thermally conductive soft adhesive which is disposed between CTE matched elements of the subassembly, which is disposed between the housing base and the laser chip and which has a hardness which is substantially less than the hardness of the CTE matched elements adjacent the layer of soft adhesive; whereby stresses generated by CTE mismatch between adjacent members are not transmitted to the laser chip through the thermally conductive soft adhesive between the spacer member and submount.