SPECIFICATIONS

Dimensional  Tolerance

(W±0.1mm)×(H±0.1mm)×(L±0.2mm)

Angle  Tolerance

Δθ＜0.25°, Δφ＜0.25°

Parallelism

＜20″

Perpendicularity

＜5′

Clear  Aperture

≥Central 95% of the diameter

Surface  Quality

10/5 (MIL-PRF-13830B)

Flatness

λ/10 @633nm

Wavefront  Distortion

＜λ/8 @633nm

CHEMICAL  AND STRUCTURAL PROPERTIES

Crystal  structure

Orthorhombic

Lattice  parameters

a=12.532Å, b=6.71Å,  c=10.864Å

Melting  point

1090℃

Mohs  hardness

4.5

Density

3.85  g/cm³

Thermal  conductivity

10W/(m·K)

Thermal  expansion coefficient

a:4.4×10^-6/K,  b:3.5×10^-6/K, c:9.3×10^-6/K

OPTICAL  AND NONLINEAR OPTICAL PROPERTIES

Transmittance

＞95%(1064nm)

Optical  uniformity

＜0.1%

Temperature  stability

＜10^-6/K

Nonlinear  optical coefficient

d11=2.2, d31=2.8, d22=0.5, d33=13.5

Thermal  coefficient

dn/dT=10^-5/K

Refractive  index

no=1.655, ne=1.542(1064nm)

Nonlinear  Coefficien(pm/v)

2.45(SHG),  2.20(THG)

Effective  SHG coefficient (SHG, THG)

1.4(SHG),  0.8(THG)

Walk-off  Angle  (mrad·cm)

29.4(type  I), 47.2(type II)

Acceptance  Angle (mrad·cm)

18.5(type  I), 24.7(type II)

Phase  Matching Range (℃m)

266~291(SHG),  500~740(THG)

Temperature  Acceptance (℃)

55(SHG),  30(THG)

Damage  Threshold(GW/cm2)

~1(SHG),  ~0.3(THG)