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Er:YAG
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The Er:YAG crystal is a high - quality crystal material that emits laser light with a wavelength of 2.94μm. The 2.94μm wavelength is at the absorption peak of the hydroxyl group (-OH), which can be strongly absorbed by biological tissues. It is widely used in laser medical systems and other fields. The Er:YAG crystal is the most important working material for 3μm lasers. It has a high slope efficiency, can operate at room temperature, and its laser wavelength is within the range of the eye - safe band. This crystal has been widely used in the medical field, such as in surgical operations, dermatological aesthetics, dental treatments, and medical blood collection.
Characteristics of Er:YAG
● High slope efficiency
● Operates at room temperature
● The laser operating wavelength is relatively safe for the human eye
Basic Parameters
| Item | Parameter |
| Chemical formula | Er3+:Y3AI5O12 |
| Doping concentration | ~50at% |
| Crystal orientation | [111] |
| Transmission wavefront distortion | λ/8 per inch @632.8nm |
| Extinction ratio | ≥25dB |
| Crystal rod dimensions | Diameter: 2 - 30mm, Length: 50 - 150mm, customizable according to customer requirements |
| Dimensional tolerance | Diameter: ±0.02mm, Length: ±0.5mm |
| Cylindrical surface processing | Precision grinding, polishing, threading |
| End - face parallelism | ≤10″ |
| Perpendicularity of the end - face to the rod axis | ≤5′ |
| End - face flatness | λ/10 per inch @632.8nm |
| Surface finish | 20 - 10 (MIL - PRF - 13830B) |
| Edge chamfer | 0.1mm@45° |
| Antireflection film reflectivity | R<0.20%@2940nm |
| Laser - induced damage threshold of the film layer | >500MW/cm2 |
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