Micro-channel heat sink based on boiling-cavitation coupling effect for LD bar

A copper micro-channel phase-change heat sink has been developed for cooling high power continual laser diode based on coupling of boiling-cavitation in micro-channel. Its exterior size was 20 mm×12 mm×1.6 mm. The length of channel was estimated through 2D numerical calculation, and the width, depth and separation were determined according to processing conditions. The electron-optic efficiency, output wavelength and the relation between input current and output power were measured experimentally when LD output power changes from 0 to 100 W. The cooling refrigerant was R134a. The thermal resistance of heat sink was measured as 0.3 ℃/W, when the magnetic drive gear pump operated at 50 r/s motor speed.