Diffusion Bonded Crystals consist of one laser crystal and one or two undoped material. They are combined by optical contact method and further bonded under high temperature. Diffusion Bonded Crystal helps to decrease thermal lensing effect considerably. Lasertec can supply 2 kinds of Diffusion Bonded Crystals: YVO4+Nd:YVO4+YVO4 and YAG+ Nd:YAG+YAG. Diffusion bonding means that the two parts that are bonded together diffuse into one another and they become as one single crystal. The technology of diffusion bonding includes the following steps: 1. Perfect optical contact between the crystals to be bonded. 2. Heating up of the two parts very slowly (within 24 hours or even more), to a very high temperature, probably 2/3 of the melt temperature or more, and exerting pressure to press the two parts together. 3. Keeping the bonded crystals for certain period of time at this high temperature, so that diffusion takes place. 4. Slowly cooling the crystals (24 hours or even more) down to room temperature.
Diffusion bonding crystal
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