Nextreme Thermal Solutions, the leader in microscale thermal and power management products for the electronics industry, announced that Voxtel, Inc., a leading developer of sophisticated detectors and electrooptical imaging systems, has integrated Nextreme's OptoCooler UPF4 thermoelectric cooler into Voxtel's VDHAX line of hermetically-packaged avalanche photodiode (APD) receivers. The new OptoCooler-equipped APD device will be used for applications in military laser radar and optical communications and commercial telecommunications.

Avalanche photodiodes are extremely sensitive semiconductor-based detectors of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum. APDs can multiply the signal produced by incident light by as much as 100 million times, enabling photon detection at very low light levels. Performance of an APD is usually limited by thermally-generated noise, which can be reduced by cooling the chip. Cooling of the photodiode improves its efficiency, lowers noise, broadens the spectral and frequency response, and improves the overall gain. Cooling also improves the device's reliability and life span required by stringent military laser radar and freespace optical communications standards.

"Our customers are requiring smaller packages that produce higher heat densities," said George Williams, President and CEO of Voxtel, Inc. "Nextreme's OptoCooler enables a lower cost structure and permits a greater amount of cooling of our new APD receiver over a wide range of environments; thereby providing stable operation and improved performance."

With Nextreme's thin-film thermal bump technology at its core, the OptoCooler™ UPF4 was integrated directly into the VDH-A TO-8 package to deliver more than 45°C of cooling during operation. The UPF4 removes a maximum of 610 mW of heat at 85°C ambient in an active footprint of only 0.55 mm2.

"We are pleased that Voxtel has chosen Nextreme's OptoCooler UPF4 for their thermal

management solution," said Dr. Paul A. Magill, vice president of marketing and business development for Nextreme. "This represents further validation of our technology in a new application space and opens up a new channel for our OptoCooler product line."

The OptoCooler UPF4 is one of several products in Nextreme's OptoCooler family of thermoelectric coolers designed specifically for the optoelectronics and telecommunications industries. All models are available now for production volume orders. Pricing is available upon request.

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