KTP(Electro-optic Crystal)

KTP(Electro-optic Crystal)
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KTP-Electro-optic Crystal is also known as potassium titanium phosphate oxychloride crystal with the chemical formula KTiOPO4. It is a crystal product with excellent nonlinear and electro-optical properties.

KTP has a high electro-optical coefficient and low dielectric constant, can operate at high frequencies, and can be used as an electro-optical Q-modulation crystal.

KTP also has excellent frequency doubling properties: large nonlinear coefficient, no deflection angle, high optical damage threshold, and phase matching.

KTP crystals are advantageous due to their high nonlinearity, high mechanical stability, high optical quality, and transparency range of 350 nm—4500 nm, and these properties determine the wide application of KTP crystals that are widely used as nonlinear media.

It is an excellent solution for Nd-doped laser frequency doubling applications, especially for low- to medium-power applications in intra-cavity and extra-cavity designs. It also has a wide range of applications related to frequency doubling (SHG) of Nd-doped lasers with green/red output and frequency mixing (SFM) of Nd lasers and diode lasers with blue output.

Features of KTP-Electro-optic Crystal:

  • High damage threshold
  • High temperature stability
  • Low half-wave voltage
  • Easy to grow into large crystals
  • Large reception angle
  • High photoelectric coefficien
  • low dielectric constant
  • Wide temperature range and spectral range

Crystal Specifications

MaterialsKTiOPO4
Angle Cutting Positioning Accuracy<30'
Phase MatchingType Ⅱ，θ=90°；φ=Phase Matching Angle
Phase Matching Range497-3300nm
Angle ToleranceΔθ≤0.25°，ΔΦ≤0.25°
Dimensional Tolerance
(W ±0.1mm)× (H± 0.1mm)×(L+0.5/-0.1mm) L≥2.5mm
(W ±0.1mm)× (H± 0.1mm)×(L+0.1/-0.1mm) L<2.5mm
Flatness
＜λ/8 @633nm
Surface Finish
10/5 S/D
Parallelism
<10“
Perpendicularity
≤5’
Coatinga) S1&S2:AR@1064nm R<0.1%
AR@532nm, R<0.25%
b) S1:HR@1064nm，R>99.8%
High temperature @808nm，T>5%
S2: HR@1064nm， R<0.1%
AR@532nm, R<0.25%
Coating can be customized according to user requirements

Crystal Physical Properties

Crystal Structure
mm2
Lattice Constant
a=6.404Å,b=10.615Å,c=12.814Å,z=8
Melting Point
～1172℃
Transformation Temperature
936℃
Decomposition Temperature～1150℃
Optical Uniformitydn～10-6/cm
Hardness～5
Density
3.01g/cm3
Specific Heat Capacity
0.1737cal/g.℃
Absorption Coefficient
a<1%/cm@1064nm和532nm
Hygroscopicity
No
Dielectric Constant
13
Thermal Coefficient of Expansion（@25℃-900℃）a1=11×10-6 ℃-1
a2=9×10-6℃-1
a3=0.6×10-6 ℃-1
Thermal Conductivity
k1=2.0×10-2 W/cm ℃
k2=3.0×10 -2W/cm ℃
k3=3.3×10-2 W/cm ℃
Conductivity3.5×10-8 s/cm(c axis，22℃，1kHz）

Crystal Optical Properties

Transparency Range497-1800nm
Thermo-optic Coeffecient
dnx/dT=1.1×10-5/℃
dny/dT=1.3×10-5/℃
dnz/dT=1.6×10-5/℃
Sellmeier Equationnx2=3.0065+0.03901/(I2-0.04251)-0.01327I2
ny2=3.0333+0.04154/(I2-0.04527)-0.01408I2
nz2=3.3134+0.05694/(I2-0.05658)-0.01682I2
Effective Nonlinear Optical Coefficientdeff(Ⅱ)≈(d24-d15)sin2θsin2φ-(d15sin2φ+d24cos2φ)sinθ
Damage Threshold
>0.5GW/cm3 used for 10ns pulses @1064nm

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