US 11,811,193 B2
CTE-tuned pyrolytic graphite (PG) substrate to minimize joining stress between laser diode and the substrate
Susant Patra, Brentwood, CA (US); Robert J. Deri, Pleasanton, CA (US); and John W. Elmer, Danville, CA (US)
Assigned to Lawrence Livermore National Security, LLC, Livermore, CA (US)
Filed by Lawrence Livermore National Security, LLC, Livermore, CA (US)
Filed on Nov. 15, 2021, as Appl. No. 17/526,497.
Application 17/526,497 is a division of application No. 15/080,516, filed on Mar. 24, 2016, granted, now 11,177,626.
Claims priority of provisional application 62/137,368, filed on Mar. 24, 2015.
Prior Publication US 2022/0181843 A1, Jun. 9, 2022
Int. Cl. H01S 5/024 (2006.01); H01S 5/02 (2006.01); H01S 5/323 (2006.01); H01L 23/522 (2006.01); H01L 23/532 (2006.01); H01S 5/40 (2006.01)
CPC H01S 5/02469 (2013.01) [H01L 23/5226 (2013.01); H01L 23/53228 (2013.01); H01S 5/021 (2013.01); H01S 5/024 (2013.01); H01S 5/0206 (2013.01); H01S 5/32316 (2013.01); H01S 5/02423 (2013.01); H01S 5/4025 (2013.01)] 8 Claims
OG exemplary drawing
 
6. A laser diode package comprising:
a laser diode having a longitudinal axis;
a first pyrolytic graphite (PG) substrate body having a diode mounting surface on which the laser diode is mounted such that the longitudinal axis is substantially parallel with the diode mounting surface, and having a PG crystalline structure with a basal plane substantially non-orthogonal to the diode mounting surface so that a coefficient of thermal expansion (CTE) of the first PG substrate body is substantially matched with a CTE of the laser diode; and
a second PG substrate body connected to the first substrate body opposite the diode mounting surface of the first substrate body, said second substrate body having a PG crystalline structure with a basal plane substantially non-orthogonal to the plane of the diode mounting surface.