Pure YAG — An Excellent Material For UV-IR Optical Windows

Short Description:

Undoped YAG Crystal is an excellent material for UV-IR optical windows, particularly for high temperature and high energy density application. The mechanical and chemical stability is comparable to sapphire crystal, but YAG is unique with non-birefringence and available with higher optical homogeneity and surface quality.

Product Detail

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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


● 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

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