Font Size: a A A

Investigation On Rb-K Ion Exchange In KTiOPO4 Optical Waveguides Implanted By Ions

Posted on:2010-06-04Degree:MasterType:Thesis
Country:ChinaCandidate:X M WangFull Text:PDF
GTID:2178360278973555Subject:Optics
Abstract/Summary:PDF Full Text Request
High-performance optical materials are indispensable to the development of laser technology. Potassium titanyl phosphate (KTiOPO4, KTP) is one of the mostattractive materials. KTP is a nonlinear optical crystal with superior properties, such as high optical damage threshold, lager linear electro-optical coefficient, high thermal stability etc. Due to the high non-linear optical coefficients, KTP is an important and necessary material in the non-linear optics field. Moreover KTP has been widely used in many fields, for example, electro-optical modulations, acoustic-optical modulations, frequency doubling and optical parametric oscillation. Especially the quasi-phase match technology extends the applications of KTP crystals in non-linear optics field.Optical waveguide is the basic unit of integrated optics and the all-optical network. It also plays an important role in the fabrication of various optical devices. A waveguide is characterized by a region of high refractive index surrounded by regions of lower index. In this structure the optical energy can be restricted in a small space, thereby enhancing the optical energy density and make better use of the non-linear optical properties of crystal.The ion implantation is an effective method to fabricate optical waveguide. Ion implantation can generate a barrier with a reduced refractive index in the depth region of high nuclear energy deposition and the region between the barrier and the atmosphere composes a waveguide structure.Ion exchange is that the doping ions exchange with the special ions of the structure, which causes the changes of the refractive index in the substrate; as a result, the optical waveguide structure is formed.Most optoelectronics devices such as optical coupler, modulator, optical switch and waveguide laser are based on channel waveguide structure. Investigation on the fabrication of channel waveguide is the foundation of application of waveguide device, and is also helpful to the application in optic-electronic field.In this dissertation, we reported the information and the properties of the planar waveguide on KTP crystal fabricated by Rb-K ion exchange combined with ion implantation, the main contents include: the influence of ion implantation on the ion exchange waveguide. He, 0 ions are implanted into KTP crystal with the energy of 2MeVå'Œ4MeV respectively. After annealing, Rb-K ion exchanges are performed on these samples. The dark mode spectra of samples are measured by prism coupling method. Compared with the results of sample without suffering ion irradiation, we can find that the damage layer generated by ion implantation act as a barrier to block the diffusion of samples. This anneal-like process can induce the diffusion of defects and the repair of the lattice damage, which will affect the ion exchange greatly.
Keywords/Search Tags:ion exchange, ion implantation, optical waveguide, KTP crystal
PDF Full Text Request
Related items