Laser Diode Heatsinks

Laser Diode Heatsinks Overview

Our Laser Diode Heatsinks and Mounts support many of the common laser diode packages including; Butterfly, DIL, C-mount, HHL (high heat load), TO-3, TO-5.6, and TO-9, and other packages.  Using state of the art design tools, these heatsinks and mounts have been optimized into a highly efficient heat transfer test bed,  improving upon the heat transfer found in most other mounts.

Our heatsinks for laser diodes feature both passive and active Peltier cooling solutions.  In short, passively cooled units conduct the heat away from the laser and dissipates it into the ambient air and actively cooled heatsinks utilizes a thermoelectric cooler (TEC) to cool the laser diode package.

See the bottom of the page on more about passive and active cooling. 

We also offer a line of water-cooled cold plates for higher power laser diode bars and arrays including fiber-coupled devices.  These high performance, high power, compact cooling modules are the ideal solution for your high power cooling needs.

Our Products

The search filters to the left can allow you to better sort through the wide range of Laser Heatsinks offered at RPMC to find the one which is best suited for your application, or you can talk to one of our laser experts today by calling 1-636-272-7227.

The two strategies for removing the heat produced by a laser diode are passive cooling and active cooling.

  • Passive cooling heatsinks conduct the heat from the laser and dissipates it into the ambient air. This type of laser mount is simply a thermal heat sink and is dependent on the temperature of the ambient air.  A passively cooled laser diode heatsink is designed to maintain a temperature at some point above the ambient air temperature.
    The thermal performance of a passive heatsink is rated as thermal resistance, in units of °C/W. This rating represents the amount of temperature increase, in degrees Celsius, the heatsink will exhibit a thermal equilibrium for every watt of waste heat generated by the laser.
    A fan will improve the thermal performance of a passively cooled heatsink. Even with a fan, the performance and power range of a passive heatsink is limited to low and medium power laser diodes or applications where higher operating temperatures are acceptable.


  • Active cooling is a more comprehensive and complex approach to thermal management. A thermoelectric cooler (TEC) is built into the laser diode heatsink or directly into the laser diode package which actively cools the laser diode. The TEC is a small, flat, thermally conductive ceramic that uses the electrical power supplied by the temperature controller to cool one of its surfaces while heating the opposing surface.
    To complete the control loop, a temperature sensor provides a feedback signal to the temperature controller, which regulates the power provided to the TEC.

The laser diode heatsink must be able to handle the waste heat from the laser diode and now additionally the waste heat from the TEC.   In many cases, the heatsink will be cooled with water (Cold Plate) or be equipped with a fan to maximize thermal performance.
The thermal performance of an actively cooled heatsink is referred to as thermal capacity and is rated in watts. This rating represents the amount of thermal power the laser mount can absorb while maintaining a stable temperature.