Shalom

Specifications

Clear aperture

central 90% of the diameter

Flatness

less than λ/8 @ 633nm

Transmitting wavefront distortion

less than λ/8 @ 633nm

Chamfer

≤0.2mmx45°

Chip

≤0.1mm

Scratch/Dig code

10/ 5 to MIL-PRF-13830B

Parallelism

better than 20 arc seconds

Perpendicularity

≤5 arc minutes

Angle tolerance

Δθ≤0.25°, ΔΦ≤0.25°

Quality Warranty Period

one year under proper use

Chemical and Structure properties

Crystal Structure

Monoclinic, Point group 2

Lattice Parameter

a=7.116Å, b=4.993Å, c=6.508Å, β=105.62° ,Z=2

Melting Point

726°C

Mohs Hardness

5-5.5

Density

5.033 g/cm³

Thermal Expansion

coefficient

αa=4.8x10^-5/K, αb=4.4x10^-6/K, αc=-2.69x10^-5/K

Optical and Nonlinear Optical properties

Transparency Range

286-2500nm

Absorption Coefficient

<0.1%/cm at 1064nm

Physical Axis

X//b,(Z,a)=31.6°,(Y,c)=47.2°

SHG of 1064/532

Phase matching angle:168.9° from z axis in YZ plane

Deff:3.0+/-0.1 pm/V

Angular acceptance:2.32 arad-cm

Walk-off angle :25.6 mrad

temperature acceptance:2.17°C-cm

Sellmeier coefficients

ni²(λ)=A+B / (λ²-C)-Dλ² (λ in um)

A

B

C

D

n1

3.6545(4)

0.0511(2)

0.0371(3)

0.0226(1)

n2

3.0740(3)

0.0323(1)

0.0316(3)

0.01337(6)

n3

3.1685(3)

0.0373(1)

0.0346(3)

0.01750(8)