Pure YAG — An Excellent Material For UV-IR Optical Windows
Product Description
Up to 3" YAG boule grown by CZ method, as-cut blocks, windows and mirrors are available.As a new substrate and optical material that can be used for both UV and IR optics. It is particularly useful for high-temperature and high-energy applications. The mechanical and chemical stability of YAG is similar to that of Sapphire, but YAG is not birefringent. This particular feature is extremely important for some optical applications. We provide high quality and optical homogenity YAG with different dimensions and specifications for the use in industrial, medical and scientific fields. YAG is grown utilising the Czochralsky technique. The as-grown crystals are then processed into rods, slabs or prisms, coated and inspected per customer specifications. YAG shows no trace absorbtion in the 2 - 3 µm region where Glasses tend to be highly absorbent because of the strong H2O band.
Advantages Of Undoped YAG
● High thermal conductivity, 10 times better than glasses
● Extremely hard and durable
● Non-birefringence
● Stable mechanical and chemical properties
● High bulk damage threshold
● High index of refraction, facilitating low aberration lens design
Features
● Transmission in 0.25-5.0 mm, no absorption in 2-3 mm
● High thermal conductivity
● High index of refraction and Non-birefringence
Basic Properties
Product Name | Undoped YAG |
Crystal structure | Cubic |
Density | 4.5g/cm3 |
Transmission Range | 250-5000nm |
Melting Point | 1970°C |
Specific Heat | 0.59 W.s/g/K |
Thermal Conductivity | 14 W/m/K |
Thermal Shock Resistance | 790 W/m |
Thermal Expansion | 6.9x10-6/K |
dn/dt, @633nm | 7.3x10-6/K-1 |
Mohs Hardness | 8.5 |
Refractive Index | 1.8245 @0.8mm, 1.8197 @1.0mm, 1.8121 @1.4mm |
Technical Parameters
Orientation | [111] within 5° |
Diameter | +/-0.1mm |
Thickness | +/-0.2mm |
Flatness | l/8@633nm |
Parallelism | ≤ 30" |
Perpendicularity | ≤ 5 ′ |
Scratch-Dig | 10-5 per MIL-O-1383A |
Wavefront Distortion | better than l/2 per inch@1064nm |