KNbO3 (Potassium Niobate) – Laser Crystal – Nonlinear Crystal – Customized Products

Product ID: 6700

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KNbO3 (Potassium Niobate) – Laser Crystal – Nonlinear Crystal – Customized Products

KNbO3 (Potassium Niobate) crystal (KN for short) is one of the very important nonlinear optical crystals. Its nonlinear optical quality factor, d2 /n3, ranks first among all oxide crystals. The average refractive index of KN is 2.2, the theoretical value of reflectivity is 14%, and the theoretical transmittance is 86%. The crystal is chemically stable, has a large nonlinear optical coefficient, and direct frequency doubling (101 mW) of a semiconductor 860 nm laser has yielded nearly 40 mW of 430 nm blue light. the KN crystal, due to its special properties, makes it an important link in the development of microlasers for this new application. The realization of blue lasers is a top priority, and KN crystals are one of the most ideal materials for generating second harmonics and realizing blue lasers.

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FEATURES
Millisecond response time
Very low scattering loss
Large nonlinear optical coefficient
High nonlinear optical coefficient
Excellent photorefractive properties
High stability under light irradiation
Favorable phase matching characteristics

Physicochemical Properties

Chemical Formula KNbO3
Crystal Structure Rhombic，mm2
Lattice Constant a = 5.6896Å,
b = 3.9692Å,
c = 5.7256Å
Mass Density 4.617 g/cm3
Melting Point 1333 K
Curie Temperature 498 K
Distribution of dielectric axis and crystallinity axis  X, Y, Z ⇒ b, a, c
Specific heat CP at P = 0.101325MPa cp= 767 J/kgK
Thermal Conductivity κ > 3.5 W/mK
Thermal Expansion aa=5.010×10-6 /℃;
ab=1.410×10-5/℃;
ac=5.010×10-7/℃

 

Nonlinear Optical Properties

Attribute Numerical
Nonlinear Optical Coefficient d31=-15.8 pm/V, d32=-18.3 pm/V @ 1064 nm
Shortest SHG Wavelength 425 nm（Type I NCPM, y-cut or a-cut）
Type I SHG has an acceptance angle of 1064 nm Dq = 0.24 mrad / cm（internal）
The acceptance temperature of type I SHG is 1064 nm DT=0.3 ℃/cm

 

Linear Optical Properties

Attribute Numerical
Transparent Range 400-5500 nm
IR Cutoff Wavelength 5.5 μm
Absorb Losses <=1%/cm @1064 nm
Damage Threshold <= 4 J/cm2 @527 nm（500ps，Single Pulse）
<= 6 J/cm2 @1054 nm（700ps，Single Pulse）

 

Phase Matching Angle Experimental Value (T=293K)

Interaction Wavelength[μm] φexp [deg] θexp [deg]
XY Plane，θ=90°
SHG, e + e ⇒ o
0.946 ⇒ 0.473 ≈30
4.7599 ⇒ 2.37995 69.9
YZ Plane, φ = 90°
SHG, o + o ⇒ e
0.86 ⇒ 0.43 83.5
0.89 ⇒ 0.445 70.7
0.92 ⇒ 0.46 64
0.94 ⇒ 0.47 60.5
1.0642 ⇒ 0.5321 46.4
1.3188 ⇒ 0.6594 30.6
1.3382 ⇒ 0.6691 29.7
3.5303 ⇒ 1.76515 37.3
4.7291 ⇒ 2.36455 77.3
SFG, o + o ⇒ e
1.3188 + 0.6594 ⇒ 0.4396 62.3
1.3188 + 1.0642 ⇒ 0.5889 37.7
4.7762 + 3.1841 ⇒ 1.9105 46.6
5.2955 + 3.5303 ⇒ 2.1182 59.5
XZ Plane, φ = 0°, θ > Vz
SHG, o + o ⇒ e
1.0642 ⇒ 0.5321 70.4
1.3188 ⇒ 0.6594 56.8
1.3382 ⇒ 0.6691 56.2
3.5303 ⇒ 1.76515 58.8
SFG, o + o ⇒ e
1.3188 + 1.0642 ⇒ 0.5889 62.6
5.2955 + 3.5303 ⇒ 2.1182 86.1

 

Experimental Value of Temperature Bandwidth at T=295K

Interaction Wavelength[μm] θexp [deg] ΔT [◦C]
YZ Plane, φ = 90°
SHG, o + o ⇒ e
1.0642 ⇒ 0.5321 46.4 0.39
1.3382 ⇒ 0.6691 29.7 0.59
3.5303 ⇒ 1.76515 37.1 2.3
SFG, o + o ⇒ e
5.2955 + 3.5303 ⇒ 2.1182 59.5 2.4
XZ Plane, φ = 0°, θ >Vz
SHG, o + o ⇒ e
1.0642 ⇒ 0.5321 71.4 0.77
1.3382 ⇒ 0.6691 56.2 2.2
3.5303 ⇒ 1.76515 58.1 10.1

 

Spectrum

TaorLab laser crystals

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