Refractive index of KNbO3 (Potassium niobate)

Optical constants of KNbO₃ (Potassium niobate)
Umemura et al. 1999: n(α) 0.40–5.3 µm

Wavelength: µm

(0.4–5.3)

Complex refractive index (n+ik)[ i ]

Derived optical constants

Dispersion formula [ i ]

$$n^2=4.4222+\frac{0.09972}{λ^2-0.05496}-0.01976λ^{2}$$

Comments

n_α; 22 °C.

References

N. Umemura, K. Yoshida, and K. Kato. Phase-matching properties of KNbO₃ in the mid-infrared, Appl Opt. 38, 991-994 (1999)

Data

[Expressions for n] [CSV - comma separated] [TXT - tab separated] [Full database record]

Optical transmission calculator

Wavelength: µm
Thickness:
Calculation method:

Transmittance[ i ]

T =

LogX LogY eV

Reflection calculator

Wavelength: µm
Angle of incidence (0~90°):
Direction: in out

Reflectance[ i ]

P-polarized

R_P =

S-polarized

R_S =

Non-polarized (Rp+Rs)/2

R =

R_P R_S R LogY

Reflection phase[ i ]

ɸ_P = °
ɸ_S = °

Brewster's angle[ i ]

θ_B = °

Critical angle[ i ] [ i ]

θ_C = °

INFO

Potassium niobate, KNbO₃

Potassium niobate (KNbO₃) is a ferroelectric crystal with notable nonlinear optical properties. It is widely used in a range of optical applications, including frequency doubling, optical parametric oscillation, and electro-optic modulation. Due to its high damage threshold and broad phase-matching capabilities, it has become a material of choice for nonlinear optical applications in the visible and near-infrared spectral ranges. KNbO₃ is also known for its photorefractive properties, which are exploited in data storage and holography. However, the material is sensitive to moisture and can degrade over time if not properly stored, requiring a controlled environment for long-term use.

RefractiveIndex.INFO

Optical constants of KNbO₃ (Potassium niobate)
Umemura et al. 1999: n(α) 0.40–5.3 µm

Complex refractive index (n+ik)[ i ]

Refractive index[ i ]

Extinction coefficient[ i ]

Derived optical constants

Relative permittivity (dielectric constants)[ i ] [ i ]

Absorption coefficient[ i ] [ i ]

Abbe number[ i ]

Chromatic dispersion[ i ]

Group index[ i ] [ i ]

Group velocity dispersion[ i ] [ i ] [ i ]

Dispersion formula [ i ]

Comments

References

Data

Optical transmission calculator

Transmittance[ i ]

Reflection calculator

Reflectance[ i ]

P-polarized

S-polarized

Non-polarized (Rp+Rs)/2

Reflection phase[ i ]

Brewster's angle[ i ]

Critical angle[ i ] [ i ]

INFO

Potassium niobate, KNbO₃

Optical constants of KNbO3 (Potassium niobate)Umemura et al. 1999: n(α) 0.40–5.3 µm

Complex refractive index (n+ik)[ i ]

Refractive index[ i ]

Extinction coefficient[ i ]

Derived optical constants

Relative permittivity (dielectric constants)[ i ] [ i ]

Absorption coefficient[ i ] [ i ]

Abbe number[ i ]

Chromatic dispersion[ i ]

Group index[ i ] [ i ]

Group velocity dispersion[ i ] [ i ] [ i ]

Dispersion formula [ i ]

Comments

References

Data

Optical transmission calculator

Transmittance[ i ]

Reflection calculator

Reflectance[ i ]

P-polarized

S-polarized

Non-polarized (Rp+Rs)/2

Reflection phase[ i ]

Brewster's angle[ i ]

Critical angle[ i ] [ i ]

INFO

Potassium niobate, KNbO3

Optical constants of KNbO₃ (Potassium niobate)
Umemura et al. 1999: n(α) 0.40–5.3 µm

Potassium niobate, KNbO₃