Crystals  Manufacturers, Traders, Suppliers

Communication field, optical fiber communication, base station equipment.
Field of industrial automation, robot control, sensor networks, PLC.
Automotive electronics field, engine management system, autonomous driving system.
Medical equipment field, aerospace field.

KTP (KTiOPO4 ) is one of the most commonly used nonlinear optical materials. For example, it’s regularly used for frequency doubling of Nd:YAG lasers and other Nd-doped lasers, particularly at low or medium-power density. KTP is also widely used as OPO, EOM, optical wave-guide material, and in directional couplers.
KTP exhibits a high optical quality, broad transparency range, wide acceptance angle, small walk-off angle, and type I and II non-critical phase-matching (NCPM) in a wide wavelength range. KTP also has relatively high effective SHG coefficient (about 3 times higher than that of KDP) and fairly high optical damage threshold (>500 MW/cm²).
Regular flux-grown KTP crystals suffer from blackening and efficiency breakdown ("grey-track") when used during SHG process of 1064 nm at high average power levels and repetition rates above 1 kHz. For high average-power applications, WISOPTIC offer high grey track resistance (HGTR) KTP crystals grown by hydrothermal method. Such crystals have a lower initial IR absorption and are less affected by green light than regular KTP, thus avoid the problems of harmonic power instabilities, efficiency drops, crystal blackening, and beam distortion.
The periodic polarized KTP (PPKTP) is a novel nonlinear optical material that can be customized to achieve all of the nonlinear applications required in the entire KTP crystal transmission band, without the phase matching limitations of conventional KTP. Moreover, the effective nonlinear coefficient of PPKTP is about 3 times higher than that of conventional KTP. In the nonlinear application of conventional KTP, the crystal must have a single domain structure, but PPKTP crystal has an artificially induced periodic domain structure. The size of the polarization interval varies depending on the application, ranging from a few microns to tens of microns. The polarization direction is usually along the direction with the largest nonlinear coefficient in the crystal, which is also different from conventional KTP, where the axial direction is determined by the constraints to achieve phase matching.
PPKTP is manufactured by depositing a structured electrode plate on the surface of the KTP single-domain substrate using microlithography. Then an electric field is applied to the crystal under precisely controlled conditions, resulting in the desired changes in the domain structure. After the polarized crystals are tested and qualified, they are cut to the desired size and finally polished and coated.
WISOPTIC provides standard PPKTP devices, including 1064nm and 946nm frequency multiplier (SHG) devices, OPO devices, etc., as well as other customized devices for special purpose. Temperature control technique is needed to use the periodic polarized crystal, which can be flexibly controlled by computer interface.
As one of the major KTP source suppliers in the whole international market, WISOPTIC has high capability of material selection, processing (polishing, coating), mass production, fast delivery and long guarantee period of quality KTP. It is also worth to mention that our price is quite reasonable.