Short Description:

  • Melting point : 1172°C
  • Density: 2.945 g/cm3
  • Transmitting range: 350nm ~ 4500nm
  • Damage threshold: 1.5-2.0MW/cm2
  • Flatness: λ/8 @ 633nm
  • Surface quality: 10-5
  • Parallelism: ≤ 10"
  • Perpendicularity: ≤ 5′
  • Product Detail

    Product Tags


    KTP exhibits high optical quality, broad transparent range, relatively high effective SHG coefficient (about 3 times higher than that of KDP), rather high optical damage threshold, wide acceptance angle, small walk-off and type I and type II non-critical phase-matching (NCPM) in a wide wavelength range.
    KTP is the most commonly used material for frequency doubling of Nd:YAG lasers and other Nd-doped lasers, particularly at the low or medium power density.


    • Efficient frequency conversion(1064nm SHG conversion efficiency is about 80%)
    • Large nonlinear optical coefficients(15 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
    • Minimum mismatch gradient
    • Super-polished optical surface
    • No decomposition below 900°C
    • Mechanically stable
    • Low cost compare with BBO and LBO


    • 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
    • Optical Waveguides for Integrated NLO and E-O Devices

    Frequency Conversion

    KTP was first introduced as the NLO crystal for Nd doped laser systems with high conversion efficiency. Under certain conditions, the conversion efficiency was reported to 80%, which leaves other NLO crystals far behind.
    Recently, with the development of laser diodes, KTP is widely used as SHG devices in diode pumped Nd:YVO4 solid laser systems to output green laser, and also to make the laser system very compact.

    KTP for OPA, OPO Applications

    In addition to its wide use as a frequency doubling device in Nd-doped laser systems for Green/Red output, KTP is also one of the most important crystals in parametric sources for tunable output from visible (600nm) to mid-IR (4500nm) due to the popularity of its pumped sources, the fundamental and second harmonic of a Nd:YAG or Nd:YLF lasers.
    One of the most useful applications is the non-critical phase-matched (NCPM) KTP OPO/OPA pumped by the tunable lasers to obtain a high conversion efficiency.KTP OPO results in stable continuous outputs of femto-second pulse of 108 Hz repetition rate and milli-watt average power levels in both signal and idler outputs.
    Pumped by Nd-doped lasers, KTP OPO has obtained above 66% conversion efficiency for down-conversion from 1060nm to 2120nm.

    Electro-Optical modulators

    KTP crystal can be used as electro-optical modulators. For more information, please contact our sales engineers.

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