50 Watt Laser Diode Cooling Block with Integrated Peltier Coolers

Product Overview:

This flexible laser diode heat sink and cooling module has been optimized for high power CS / CCP Bar Mounts and 2-Pin 915nm, 940nm, 980nm fiber coupled laser diode pumps. Embedded high efficiency TEC's and a fan provide high temperature stability and precise temperature control. The fan pulls air away from the front of the heat sink. This makes these heat sinks easy to use on optical tables with CS bar style diodes or fiber coupled devices. The waste heat is pulled away from the laser package and from the optics by the fan. The fan is configurable to allow a user to remove the fan and change the direction of the air flow as desired. This allows the user to optimize the performance for the ambient air flow conditions in the lab.

Cooling Design Details:
The mounting base for the laser diode is temperature controlled by peltier / TEC coolers. The maximum operating current for the TE cooler is 4.2 amp with a maximum voltage draw of 24 volts DC at room temperature. The current and voltage required for the TE cooler will increases as the temperature of the lab increases. The user should not exceed the maximum specified current. Exceeding the max. power ratings will reduce the performance of the TE cooler and reduce its reliability. The typical current required for each of the TEC's is in the 3 to 4 amp range. This will vary due to the desired temperature set point and the heat load. The interface quality between the laser diode and the heat sink also contributes highly to the performance of the unit. It is recommended to use a thermal compound or a phase change material to facilitate the heat dissipation through the laser package into the heat sink. Users are advised to manually adjust the current to the TEC after attaching the diode to the top plate. This will allow the user to identify the optimum current and set the current limit on the TEC controller appropriately. All of the pelteir elements used are environmentally sealed to allow operation below dew points. For high power laser modules with large footprints, it is very difficult to maintain uniform high quality interface. The cold plate is made of copper. Copper offers low thermal resistance and allows the heat to spread out from the module across the cold plate.