Mr. Matt Flannery Profile

Matt Flannery

at Advanced Cooling Technologies Inc

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Proceedings Article | 7 March 2014 Paper

Nanoscale coatings for erosion and corrosion protection of copper microchannel coolers for high powered laser diodes

Matthew Flannery, Angie Fan, Tapan Desai

Proceedings Volume 8965, 896505 (2014) https://doi.org/10.1117/12.2037770

KEYWORDS: Corrosion, Copper, Resistance, Gold, Nickel, High power lasers, Diodes, Plating, Semiconductor lasers, Reliability

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High powered laser diodes are used in a wide variety of applications ranging from telecommunications to industrial applications. Copper microchannel coolers (MCCs) utilizing high velocity, de-ionized water coolant are used to maintain diode temperatures in the recommended range to produce stable optical power output and control output wavelength. However, aggressive erosion and corrosion attack from the coolant limits the lifetime of the cooler to only 6 months of operation. Currently, gold plating is the industry standard for corrosion and erosion protection in MCCs. However, this technique cannot perform a pin-hole free coating and furthermore cannot uniformly cover the complex geometries of current MCCs involving small diameter primary and secondary channels. Advanced Cooling Technologies, Inc., presents a corrosion and erosion resistant coating (ANCER^TM) applied by a vapor phase deposition process for enhanced protection of MCCs. To optimize the coating formation and thickness, coated copper samples were tested in 0.125% NaCl solution and high purity de-ionized (DIW) flow loop. The effects of DIW flow rates and qualities on erosion and corrosion of the ANCER^TM coated samples were evaluated in long-term erosion and corrosion testing. The robustness of the coating was also evaluated in thermal cycles between 30°C – 75°C. After 1000 hours flow testing and 30 thermal cycles, the ANCERT^M coated copper MCCs showed a corrosion rate 100 times lower than the gold plated ones and furthermore were barely affected by flow rates or temperatures thus demonstrating superior corrosion and erosion protection and long term reliability.

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