Potassium Titanyl Phosphate (KTP) is perfect nonlinear optical material suitable for use in a lot of different laser systems. KTP is liked because of its‘ stable physical properties and high nonlinear coefficient. That is why one of KTP usuall applications is to generate second harmonic for Nd:YAG ( 532 nm ) absorbing 1064 nm radiation. KTP also has physical properties which allows it to be used in electro-optic modulation and optical parametric generation.


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  • Optola offers large crystal sizes by request.
  • Crystals with custom dimensions are available.
  • Dimension tolerance: ±0.1mm
  • Clear aperture: central 90% of the diameter
  • Flatness: less than λ/8 @ 633nm
  • Transmitting wavefront distortion: less than λ/8 @ 633nm
  • Chamfer: ≤0.2mm@45°
  • Chip:≤0.1mm
  • Surface quality Scratch/Dig: 10/ 5
  • Parallelism: 20 arc seconds
  • Perpendicularity: ≤5 arc minutes
  • Angle tolerance: △θ≤0.25°, △ф≤0.25°
  • Damage threshold:

           >0.5 GW/cm2  for 1064nm, 10ns, 10HZ (AR-coated)
           >0.3 GW/cm2  for 532nm, 10ns, 10HZ (AR-coated

 Transparency Range  350~4500nm
 SHG Phase Matchable Range  497 ~ 1800nm  (Type II)
 Thermal-optic Coefficients (/°C)  dnx/dT=1.1X10-5
 Absorption Coefficients <0.1%/cm at 1064nm    <1%/cm at 532nm
 For Type II SHG of a Nd:YAG laser at 1064nm Temperature Acceptance: 24°C·cm 
Spectral Acceptance: 0.56nm·cm
Angular Acceptance: 14.2mrad·cm (φ);55.3mrad·cm (θ)
Walk-off Angle: 0.55°
NLO Coefficients deff(II)≈(d24 – d15)sin2Φsin2θ – (d15sin2Φ + d24cos2Φ)sinθ
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
Electro-optic Coefficients:






Low frequecy(pm/V)        High frequency(pm/V)

               9.5                               8.8                   

              15.7                             13.8

               36.3                             35.0

                7.3                               6.9

                9.3                               8.8

Dielectric Constant εeff=13
Sellmeier Equations  

    (λ in μm)

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