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KTP Crystal

  Applications Frequency Doubling (SHG) of Nd-doped Lasers for Green/Red Output  
    Frequency Mixing (SFM) of Nd Laser and Diode Laser for Blue Output  
    Parametric Sources (OPG, OPA and OPO) for 0.6mm-4.5mm Tunable Output  
    Electrical Optical(E-O) Modulators, Optical Switches, and Directional Couplers  
    Electrical Optical(E-O) Modulators, Optical Switches, and Directional Couplers  
    Optical Waveguides for Integrated NLO and E-O Devices  
  Features Efficient frequency conversion(1064nm SHG conversion efficiency is about 80%)  
    Large nonlinear optical coefficients(1.5 times that of KDP)  
    Wide angular bandwidth and small walk-off angle  
    Broad temperature and spectral bandwidth  
    High thermal conductivity (2 times that of BNN crystal )  
    Moisture free  
    Super-polished optical surface  
    No decomposition below 900°C  
    Low cost compare with BBO and LBO  
    Gray-tracking at high power limited it's application to moderate power density  
Main Specification Material KTiOPO4  
Orientation accuracy of cut angle <30 arc min  
Phase matching type Type II, θ=90°; φ=phase-matching angle  
Phase matching range 497nm – 3300 nm  
Coating a) 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%
Customized coating available upon customer request.
Angle tolerance θ0.25°, ф0.25°  
Dimension tolerance (Width±0.1mm)×(Height±0.1mm)×(Length+0.5/-0.1mm) for Length2.5mm  
(Width±0.1mm)×(Height±0.1mm)×(Length+0.1/-0.1mm)  for Length<2.5mm
Flatness <λ/8 @ 633nm  
Surface quality 10/5 Scratch/dig per MIL-O-13830A  
Parallelism <10 arc sec  
Perpendicularity 5 arc min  
Wavefront distortion < λ/8 @ 633nm  
Clear aperture 90% central area  
Working temperature 25°C - 80°C  
Physical Properties Crystal Structure Orthorhombic Point group: mm2  
Lattice Parameters a=6.404Å, b=10.615Å, c=12.814Å, Z=8  
Melting Point About 1172°C  
Transition Temperature 936°C  
Temperature of decomposition ~1150°C  
Optical Homogeneity dn ~10-6/cm   
Hardness ~5  
Density 3.01 g/cm3  
Specific heat 0.1737 cal/g.°C  
Absorption Coefficient a < 1%/cm @1064nm and 532nm  
Hygroscopic Susceptibility No  
Dielectric constant eeff = 13  
Thermal Expansion Coefficients a1 = 11 x 10-6 °C-1  
(in the range of 25°C- 900°C) a2 = 9 x 10-6 °C-1
  a3 = 0.6 x 10-6 °C-1
Thermal Conductivity 0.13 W/cm/°C  
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
Electrical conductivity 3.5x10-8 s/cm (c-axis, 22°C, 1KHz)  
Linear Optical Properties Transparency Range 350nm ~ 4500nm  
Refractive Indices    
Therm-Optic Coefficients dnx/dT=1.1x10-5/°C  
Sellmeier Equations nx2=3.0065+0.03901/(l 2-0.04251)-0.01327l 2  
ny2=3.0333+0.04154/(l 2-0.04547)-0.01408l 2
nz2=3.3134+0.05694/(l 2-0.05658)-0.01682l 2
 (λ in μm)
  Nonlinear Optical Properties Phase-matchable SHG range 497 ~ 1800nm  (Type II)  
For Type II SHG of a Nd:YAG laser at 1064nm    
NLO coefficients d31=2.54pm/V, d31=4.35pm/V, d31=16.9pm/V  
d24=3.64pm/V, d15=1.91pm/V at 1.064 mm
Non-vanished NLO susceptibilities d31=6.5 pm/V           d24=7.6 pm/V  
d32= 5 pm/V            d15=6.1 pm/V
d33=13.7 pm/V
Effective nonlinear optical coefficients deff(II) (d24 - d15)sin2qsin2j - (d15sin2j + d24cos2j)sinq  
Electro-Optic Coefficients    
Damage Threshold >0.5 GW/cm2 for 10 ns pulses @ 1064 nm  
  Notice Engineers can select and design the best solution for you, if the main parameters of your laser are  provided, such as energy per pulse, pulse width and repetition rate for a pulsed laser, power for a cw laser, laser beam diameter, mode condition, divergence, wavelength tuning range, etc.