A-Star’s Diffusion Bonding Crystal
Diffusion bonded crystals consist of a laser crystal attached to slabs of undoped materials. This high-temperature bonding process allows for minimally reflective interfaces. The slabs of undoped materials improve beam quality and especially reduce the thermal lensing effect with respect to unbonded crystals.
A-Star Photonics can supply many kinds of diffusion bonded crystals, such as YVO4+Nd:YVO4+YVO4 and YAG+ Nd:YAG+YA
Diffusion Bonding Crystal Standard Specification:
| Nd:YVO4 Doping | atm 0.2-3% |
| Nd:YAG Doping | 0.5-1.1% |
| Wavefront Distortion | < l /8 at 633 nm |
| Orientation | ±0.5deg. |
| Dimensional Tolerance | ± 0.1mm |
| Surface quality | 10/5 Scratch/Dig per MIL-O-13830B |
| Flatness | l /10 at 633 nm |
| Clear Aperture | > Central 90% |
| Parallelism | < 10 arc sec. |
| Intrinsic Loss | < 0.1% cm -1 |
| Coating: | AR or HR coating |
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 Bonded Crystals (DBC) are crystals consisting of two, three or more parts with different doping levels or different dopant, usually one laser crystal and one or two undoped crystals combined by optical contact and further bonded under high temperature.
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