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Oclaro Technology Limited

René Todt

Norbert Lichtenstein

Julien Boucart

Stefan Weiss

Martin Krejci

A high power laser source comprises a bar of laser diodes having a first coefficient of thermal expansion CTEon a submount having a second coefficient CTEand a cooler having a third coefficient CTE. The submount/cooler assembly shows an effective fourth coefficient CTEdiffering from CTE. This difference leads to a deformation of the crystal lattice of the lasers' active regions by mechanical stress. CTEis selected to be either lower than both CTEand CTEor is selected to be between CTEand CTE. The submount may either comprise layers of materials having different CTEs, e.g., a Cu layer of 10-40 &#x3bc;m thickness and a Mo layer of 100-400 &#x3bc;m thickness, or a single material with a varying CTE. Both result in a CTEvarying across the submount's thickness.

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Adliswil, Switzerland

René Todt