Coherent light generators – Particular temperature control
Patent
1997-12-19
1999-10-26
Healy, Brian
Coherent light generators
Particular temperature control
372 29, 372 39, 372 40, 372 69, 372 70, 372 71, 372 72, 372 75, H01S 304
Patent
active
059740612
ABSTRACT:
A laser pump cavity apparatus with integral concentrator provides improved thermal lensing control, cooling and fracture strength. The concentrator is formed around a doped solid-state laser medium by diffusion bonding, using a material different than the doped laser medium and with a substantially lower index of refraction, higher thermal conductivity and higher stress fracture strength than the doped laser crystal. The concentrator has a top cladding layer with a cylindrical focusing surface and a bottom cladding layer with a cylindrical focusing surface and may have edge cladding layers. Cold plates, each of which also has one cylindrical surface, are placed in thermal contact with the cylindrical surfaces of the top and bottom cladding layers. The cylindrical surfaces preferably have hyperbolic or quasi-hyperbolic shape. The laser pump cavity apparatus is preferably pumped with several laser diode arrays in directions transverse to a laser beam axis. The pumplight is injected from the laser diode arrays through the edge cladding layers in directions toward line foci of the cylindrical surfaces. The concentrator top and bottom cladding material is preferably sapphire and the doped solid-state laser medium is preferably Yb:YAG. The edge cladding layers are preferably thermally insulating to maintain a one-dimensional heat flow condition within the doped laser medium, by forming them of a material that has lower thermal conductivity than the material used for the top and bottom cladding layers. The edge cladding layers are preferably made of undoped YAG material
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Bruesselbach Hans W.
Byren Robert W.
Sumida David S.
Alkov Leonard A.
Healy Brian
Lenzen, Jr. Glenn H.
Raufer Colin M.
Raytheon Company
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