Highly efficient heat exchangers for laser diode arrays

Abstract

Highly efficient heat exchangers with uniform temperature distribution based on microchannel and porous structure are developed. The heat exchange efficiency dependence on construction peculiarities of the devices and cooling liquids properties are shown. Basing on the comparison of both experimental results and the numerical simulation, the ways to obtain the device thennal resistance about 0,2 C/W are discussed. Practical neededs for fabrication both linear diode arrays with power more than 1 kW will be observed.Key worlds: laser diode array, microchannel and porous heat sink I . IntroductionOwing to a strong dependence of the output radiation characteristics, device reliability and effective lifetime of the setnicondor lasers on temperature, the heat exchanger is an essential part ofthe construction. Now the microchannel heat exchanger manufactured with the employment of the high thermoconductive materials is the most widespread type of the device design for the powerful semiconductor lasers. It is a rectangular parallelepiped box, fihledhy a slit channels oriented perpendicularly to a plane of the coolled device attachment. Such heat exchanger provides enough uniform cooling with a small hydraulic resistance. It is simple in manufacturing. Most of the heat exchangers for powerful diode lasers are developed on the basis of the mentioned above design.

Heat Transfer and Thermal Air Management in the Electronics and Process Industries

“…The thermal pathway is often a cold www.intechopen.com plate with high thermal conductivity and since there is no contact between the module and cooling agent, the latter can be any suitable liquid. The high thermal conductivity and environmental-friendliness of water make it the most common cooling agent, however foam-filled cold plates are increasingly being used for high heat flux cooling applications (Apollonov, 1999(Apollonov, , 2000. …”