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Potassium Niobate ( KNbO3 )     

Crystal properties

Symmetry

Orthorhombic

Point group

2 mm (@ temperature fromm 50C to 222 4C)

Lattice Parameters

A = 5.68961
B = 3.9692
C = 5.7256
 

Thermal Expansion.

Aa = 5.010 x 10-6/C
Ab = 1.410 x 10-5/C
Ac = 5.010 x 10-7/C

Density

4.62 g/cm

Hardness (Mohs)

5

Phase Transition Temperature

-50 C; 220C; 430C

Transsparent Range

400 4500 nm

Absorption loss

1 %/cm @ 1064 nm

Damage threshold

4 J/cm @ 527 nm (500 ps, single pulse)
6 J/cm @1054 nm (700 ps, single pulse)

Principal Axes Crystallographic Axes

x c, y a, z b
( ie. Nb> na> nc )

Typical Refractive Index

na (ny)

nb (nz)

nc (nx)

430 nm

2.4145

2.4974

2.2771

532 nm

2.3223

2.3813

2.2022

860 nm

2.2372

2.2784

2.1338

1064

2.2195

2.2576

2.1194

Sellmeier Equations: ( l in mm)

nx2 = 4.4208 + 0.10044 /(l2 0.054084) 0.019592 l2

ny2 = 4.8355 + 0.12839 /(l2 0.056342) 0.025379 l2

nx2 = 4.9873 + 0.15149 /(l2 0.064143) 0.028775 l2