Nonlinear Optical Crystals: KTP

KTP (Potassium Titanyl Phosphate) crystals is the most commonly used material for frequency doubling of Nd-doped lasers, particularly at the low or medium power density.It is widely used for frequency mixing to generate Red/Green/Blue output, and for OPO and OPA to generate visible to mid-infrared tunable output. It is also used for many E-O devices such as Q-switches and E-O modulators.


  • Large nonlinear optical coefficient
  • Wide angular bandwidth and small walk-off angle
  • Broad temperature and spectral bandwidth
  • High Electro-Optics(E-O) coefficient and low dielectric constant
  • Non-hygroscopic, chemically and mechanically stable

KTP’s 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 600nm – 4500nm Tunable Ouptut
    • E-O Modulators, Optical Switches, Directional Couplers
    • Optical Waveguides for Integrated NLO and E-O Devices

 We offer KTP specification:

Tolerance of cutting angle △θ≤±0.25°,△φ≤±0.25°
Tolerance of dimension Dimension+/-0.1 mm,L:±0.1mm
Flatness λ/8 @ 632.8nm
Wavefront distortion λ/8@ 632.8nm
Surface quality 10/5  per MIL-O-13830A
Parallelism 10″
Perpendicularity 5′
Bevel/chamfer <0.1mm@45deg.
Chips <0.1mm
CA >95%
Coating AR/HR coating Upon customer’s request
Damage Threshold   750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz
Warranty         One year under proper use


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