Periodically Poled KTP (PPKTP)
Periodically Poled KTP is an entirely new type of non-linear material. It can be tailor- made for all non-linear applications within the transparency range of KTP, without the phase matching limitations of bulk KTP. It’s effective non linear coefficient is about three times larger than that of bulk KTP.
Raicol offers PPKTP in large production quantities, as well as small quantities for development work.
KTP is a ferroelectric crystal. In the classic use of bulk KTP, it is important to have a single domain crystal. In PPKTP, a periodic domain structure is artificially induced in the crystal. The exact spacing of these periods depends on the application, and ranges from a few microns to tens of microns. The period is induced in the direction in the crystal that has the highest non-linear coefficient, as opposed to the bulk crystal, where the direction is dictated by the phase matching constraints.
Some degree of crystal temperature control is necessary in using PPKTP.
PPKTP is produced in a multi-step process. An electrode of the desired structure is deposited on the surface of a KTP wafer, using micro lithographic techniques. An electric field is applied to the crystal under carefully controlled conditions, thus inducing the desired change in domain structure. The resulting KTP is then tested, cut into appropriate pieces, polished and coated.
The technique lends itself to mass production at a reasonable cost.
PPKTP is available in standard elements for some common applications, such as second harmonic generation of 1064 nm and 946 nm. It can be also be specially designed and manufactured for specific applications.
TYPICAL SPECIFICATIONS:
- Wavelength Range：0.400 to 4.0 micron
- Dimensions：Thickness (typical):1 mm, Width (typical):2 mm, Length: up to 30 mm
Second Harmonic Generation in Periodically Poled and Bulk KTP
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