KTP Crystal 

KTP crystal or Potassium Titanium Oxide Phosphate (KTiOPO4 ) is an efficient nonlinear optical crystal in the visible to infrared spectral region with relatively low cost. It has large nonlinear coefficient. The effective nonlinear optical coefficient of KTP deff at 1064nm is more than 1.5 times that of BBO. It's damage threshold is near 1 GW/cm2 for 1 Hz 10 ns pulses at 1064nm. However, it is now limited to moderate to low power applications due to it's gray-tracking problem. Recently we have developed gray-tracking-improved KTP (i-KTP) which has significantly raised the gray-tracking trigger power.

Advantage:

Disadvantage:

Additional applications for KTP include mixed frequency, electro-optical modulation, optical parametric generation and optical waveguide.

Application:

Main Specification:

Dimension 1x1x0.05 - 30x30x40 mm
Phase matching type Type II, θ=90; φ=phase-matching anglea) S1&S2: AR @1064nm R<0.1%; AR @ 532nm, R<0.25%.

b) S1: HR @1064nm, R>99.8%; HT @808nm, T>5%
S2: AR @1064nm, R<0.1%; AR @532nm, R<0.25%
Typical Coating Customized coating available upon customer request.
Angle tolerance 6'
Dimension tolerance Δθ< 0.5; Δφ< 0.50.02 - 0.1 mm
Flatness (W 0.1mm) x (H 0.1mm) x (L + 0.2mm/-0.1mm) for NKC series
λ/8 @ 633nm10/5 Scratch/dig per MIL-O-13830A
<10'
Scratch/Dig code better than 10 arc seconds for NKC series
Parallelism 5'
Perpendicularity 5 arc minutes for NKC series
Wavefront distortion less than λ/8 @ 633nm
Clear aperture 90% central area
Working temperature 25C - 80C
Homogeneity dn ~10-6/cm

Note:
To inquire or order a finished KTP crystals, please provide detailed specifications as listed in the above. We require engineering drawing for specific orientation. For special applications, please consult us for the designs if you are sure about the phase matching angle .

Physical Properties:

Crystal structure Orthorhombic
Point group mm2
Melting point 1172C incongruent
Lattice parameters a=6.404, b=10.615, c=12.814, Z=8
Temperature of decomposition ~1150C 
Transition temperature 936C
Mohs hardness ~5
Density 2.945 g/cm3
Color colorless
Hygroscopic susceptibility no
Specific heat 0.1737 cal/g.C
Thermal conductivity 0.13 W/cm/C
Electrical conductivity 3.5x10-8 s/cm (c-axis, 22C, 1KHz)
Thermal expansion coefficients a1 = 11 x 10-6 C-1
a2 = 9 x 10-6 C-1
a3 = 0.6 x 10-6 C-1 
Thermal conductivity coefficients k1 = 2.0 x 10-2 W/cm C
k2 = 3.0 x 10-2 W/cm C
k3 = 3.3 x 10-2 W/cm C 
Dielectric constant eeff = 13

Optical Properties:

Transmitting range 350nm ~ 4500nm
Refractive indices
nx ny nz
1064nm 1.7400 1.7469 1.8304
532nm 1.7787 1.7924 1.8873
Absorption coefficients a < 1%/cm @1064nm and 532nm
Therm-optic coefficients dnx/dT=1.1x10-5/C
dny/dT=1.3x10-5/C
dnz/dT=1.6x10-5/C
Electro-optic coefficients
Low frequency (pm/V) High frequency
(pm/V)
r13 9.5 8.8
r23 15.7 13.8
r33 36.3 35.0
r51 7.3 6.9
r42 9.3 8.8
Sellmeier equations nx2=2.10468 + 0.89342λ2/(λ2-0.04438)-0.01036λ2 
ny2=2.14559 + 0.87629λ2/(λ2-0.0485)-0.01173λ2 
nz2=1.9446 + 1.3617λ2/(λ2-0.047)-0.01491λ2

Nonlinear Optical Properties

Phase matching range 497nm 3300 nm
Nonlinear coefficients
(@ 10-64nm)
d31=2.54pm/V, d31=4.35pm/V, d31=16.9pm/V
d24=3.64pm/V, d15=1.91pm/V at 1.064 mm
Effective nonlinear optical coefficients deff (II) ≈ (d24 - d15)sin2qsin2j - (d15sin2j + d24cos2j)sinq

Nonlinear Optical Properties

Phase matching range 497nm 3300 nm
Nonlinear coefficients
(@ 10-64nm)
d31=2.54pm/V, d31=4.35pm/V, d31=16.9pm/V
d24=3.64pm/V, d15=1.91pm/V at 1.064 mm
Effective nonlinear optical coefficients deff (II) ≈ (d24 - d15)sin2qsin2j - (d15sin2j + d24cos2j)sinq

Type II SHG of 1064nm Laser:

Phase matching angle q=90, f=23.2
Effective nonlinear optical coefficients deff  8.3 x d36(KDP) 
Angular acceptance Dθ= 75 mrad Dφ= 18 mrad
Temperature acceptance 25C.cm 
Spectral acceptance 5.6 cm
Walk-off angle 1 mrad
Optical damage threshold 1.5-2.0MW/cm2

 

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