Published
by Rogers Corporation
Advanced Electronics Solutions
The following paper was presented at Photonics West 2024 in San Francisco, CA. It was authored by J. Wiesend, F. Wagle, and S. Lutter, who present finite-element-method (FEM) simulation results of a new Micro-Channel Cooler (MCC) stack setup for single emitter laser diodes and a solid copper heatsink reference with variable heat transfer coefficient (α) on the bottom side.
Rogers micro-channel coolers (MCC) cover a wide range of thermal management applications, such as laser diode heat sinks and CPU coolers. Apart from top-of-the-line thermal performance, some applications require a particularly homogeneous temperature distribution. In this paper, we present finite-element-method (FEM) simulation results of a new MCC stack setup for single emitter laser diodes and a solid copper heatsink reference with variable heat transfer coefficient (α) on the bottom side. Characteristic curves for temperature (T), temperature difference (ΔT) between optical components and pressure drop are shown as a function of α and flow rate. We find a ΔT of less than 2 K between the semiconductor elements and a total T reduction of >20 K compared to the reference heatsink.
Keywords: Micro-channel cooler, Micro-channel heat sink, Single emitter, Liquid cooling, Active cooling
“Coherent Corp. (Nasdaq: COHR), a leader in high-power semiconductor lasers, today announced the introduction of its next-generation pump laser diodes that achieve an industry-record high output power of 50 W from a single chip” (Coherent Corp., January 17, 2023). Reading through this statement triggered some thoughts, how would Rogers’ Micro-Channel Coolers perform in single emitter applications and is there a need for improved cooling of those next generation of chips. Hitherto, Rogers´ MCCs mostly have been used in laser diode bar stacks. Since customers´ heat management challenges in high power single emitter packages are also reaching a new level, several active cooled approaches are tested. Our partners are facing the challenge to keep laser diodes within their operation temperature specifications. Secondly, they look for low temperature offset between the semiconductors. Therefore, we started testing and evaluating Rogers’ Micro-Channel Coolers in this field of application. As a result, micro-channel designs have been benchmarked with standard heat sinks.
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Published on Mar 05, 2024