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New OptoCooler Applications
Feb 2008
Nextreme Thermal Solutions Inc.Request Info
DURHAM, N.C., Feb. 7, 2008 -- Nextreme Thermal Solutions said it has new applications for its recently introduced UPF (ultrahigh packing fraction) OptoCooler: the cooling of LEDs and temperature control of laser diodes. When embedded in a laser diode package, the OptoCooler module can pump a heat density up to 78 W/cm2 -- an industry first, the company said -- to maintain the diode's optimal operating conditions and performance.

Laser diodes -- devices that illuminate telecom fiber optic cables -- use thermoelectric devices for precision temperature control to improve diode output levels and wavelength integrity. A major trend in photonics, however, has been the move to smaller, more integrated and cheaper packaging in order to enable a lower cost structure and to open the door for higher volume manufacturing. In the course of this transition, conventional thermoelectric cooling (TEC) solutions have become increasingly difficult to implement as size and power densities have not been addressed with conventional bulk thermoelectric technology.

NextremeOptocooler.jpgA low-power laser diode might generate as little as 0.09 W of power; however, the diode's size is only ~300 x 200 µm. This then equates to a device producing ~150 W/cm2. Even if that power is spread by a factor of 30 (to 5 W/cm2) it still falls outside the operating regime of a typical bulk TEC, especially within the constraints of the package size, Nextreme said.

Thin-film thermoelectric cooling devices can pump more heat and be made much smaller than conventional thermoelectric devices. The UPF OptoCooler, a thermoelectric module introduced last month, removes a maximum of 420 mW of heat at 25 °C ambient in an active footprint of only 0.55 mm2. As a result, the module can pump a heat density up to 78 W/cm2 or cool up to 45 °C. At 85 °C, these values increase to 610 mW, 112 W/cm2 and 60 °C, respectively.

OptoCooler modules are available now and can be purchased for $12 in 1000-unit volumes. Pricing for smaller or larger volumes are available upon request.

For more information, visit:; e-mail:

Nextreme Thermal Solutions
3908 Patriot Dr., Suite 140
Durham, NC 27703
Phone: (919) 597-7300
Fax: (919) 597-7301


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