US 11,876,343 B2
Laser diode packaging platforms
Thilo Vethake, West Windsor, NJ (US); Stefan Heinemann, Hightstown, NJ (US); and Le Zhao, Bethlehem, PA (US)
Assigned to Trumpf Photonics, Inc., Cranbury, NJ (US)
Filed by Trumpf Photonics, Inc., Cranbury, NJ (US)
Filed on May 18, 2021, as Appl. No. 17/323,329.
Prior Publication US 2022/0376478 A1, Nov. 24, 2022
Int. Cl. H01S 5/00 (2006.01); H01S 5/02365 (2021.01); H01S 5/40 (2006.01); H01S 5/024 (2006.01); H01S 5/023 (2021.01); H01S 5/0239 (2021.01); H01S 5/02315 (2021.01); H01S 5/042 (2006.01); H01S 5/0237 (2021.01); H01S 5/02345 (2021.01)
CPC H01S 5/02365 (2021.01) [H01S 5/023 (2021.01); H01S 5/0239 (2021.01); H01S 5/02315 (2021.01); H01S 5/02469 (2013.01); H01S 5/4012 (2013.01); H01S 5/4018 (2013.01); H01S 5/4025 (2013.01); H01S 5/4031 (2013.01); H01S 5/0237 (2021.01); H01S 5/02345 (2021.01); H01S 5/042 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A laser diode assembly comprising:
a first heat sink extending along a horizontal direction;
a second heat sink arranged above the first heat sink in a vertical direction, and extending along the horizontal direction;
a third heat sink arranged above the second heat sink in the vertical direction, and extending along the horizontal direction;
a first plurality of laser diode units spaced apart from one another along the horizontal direction en between the first heat sink and the second heat sink, each laser diode unit of the first plurality of laser diode units comprising:
a first submount positioned on the first heat sink;
a laser diode comprising an active layer between a first-type doped semiconductor layer and a second-type doped semiconductor layer, a bottom side of the laser diode being positioned on the first submount; and
a second submount positioned on a top side of the laser diode,
wherein the first submount, the laser diode, and the second submount in the laser diode unit are sequentially positioned on the first heat sink along a vertical direction perpendicular to the horizontal direction, and
wherein the laser diodes of the first plurality of laser diode units are electrically connected in series;
a first plurality of vertical conductors between the first heat sink and the second heat sink, wherein each vertical conductor of the first plurality of vertical conductors is between a pair of adjacent laser diode units along the horizontal direction, extends vertically between the first heat sink and the second heat sink, and provides an electrical connection between the pair of adjacent laser diode units;
a second plurality of laser diode units spaced apart from each other along the horizontal direction between the second heat sink and the third heat sink, each laser diode unit of the second plurality of laser diode units comprising a respective laser diode, wherein the laser diodes of the second plurality of laser diode units are electrically connected in series, wherein the first plurality of laser diode units are electrically connected in series to the second plurality of laser diode units;
at least one first redirecting mirror arranged to receive and redirect light emitted by the first plurality of laser diode units; and
at least one second redirecting mirror arranged to receive light emitted by the second plurality of laser diode units and the light redirected by the at least one first redirecting mirror.