|
Undoped
YAG Crystal (Y3Al5O12)
|
|
Undoped
YAG Crystal is an excellent material for UV-IR optical windows,
particularly for high temperature and high energy density
applications. 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. Up to 3" YAG boule grown by CZ method, as-cut blocks,
windows and mirrors are available from Dream
Lasers.
|
|
Main
Features:
l
Transmission
in 0. 25 - 5.0mm,
no absorption in 2 - 3mm.
l Extremely hard and
durable
l High thermal conductivity
l High bulk damage
threshold
l High index of refraction
and Non-birefringence
|
 |
|
|
Basic
Properties:
|
|
Crystal Structure
|
Cubic
|
|
Density
|
4.5 g/cm3
|
|
Transmission
Range |
250 - 5000
nm |
|
Melting Point
|
1970 oC
|
|
Specific Heat
|
0.59 W ， s
， g-1 ， K-1 |
|
Thermal Conductivity
|
14 W，m-1，K-1 |
|
Thermal Shock
Resistance |
790 W /m
|
|
Thermal Expansion
|
6.9x10-6
/K |
|
dn/dT, @ 633nm
|
7.4x10-6
/K-1 |
|
Mohs Hardness
|
8 ~ 8.5
|
|
Refractive
Index |
1.8245 @ 0.8mm,
1.8197 @ 1.0mm,
1.8121 @ 1.4mm |
|
|
Main
Specifications of YAG Windows and Mirrors:
|
|
Orientation
|
[111] within
5o |
|
Diameter
|
+/-0.1 mm
|
|
Thickness
|
+/-0.2 mm
|
|
Flatness
|
better than
λ/8 @ 633 nm |
|
Parallelism
|
better than
30" |
|
Perpendicularity
|
better than
5' |
|
Scratch-Dig
|
10-5
per MIL-O-13830A |
|
Wavefront Distortion
|
better than
λ/2 per inch @ 1064 nm |
|
|
|
Other
high-precision windows, AR- and HR-coatings are available
upon request.
|
