This paper reports on buried waveguides fabricated in lithium niobate (LN) by the method of direct femtosecond (fs) laser inscription. 5% MgO doped LiNbO3 was chosen as the host material because of its high quality and damage threshold, as well as relatively low cost. Direct fs inscription by astigmatically shaped beam in crystals usually produces multiple 'smooth' tracks (with reduced refractive index), which encircle the light guiding 'core', thus creating a depressed cladding WG. A high-repetition rate fs laser system was used for inscription at a depth of approximately 500 μm. Using numerical modelling, it was demonstrated that the properties of fs-written WGs can be controlled by the WG geometry. Buried, depressed-cladding WGs in LN host with circular cross-section were also demonstrated. Combining control over the WG dispersion with quasi-phase matching will allow various ultralow-pump-power, highly-efficient, nonlinear light-guiding devices - all in an integrated optics format.
|Title of host publication||2013 Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference|
|Place of Publication||Piscataway, NJ (US)|
|Number of pages||1|
|ISBN (Print)||978-1-4799-0593-5 , 978-1-4799-0594-2|
|Publication status||Published - 2013|
|Event||2013 Conference on Lasers and Electro-Optics Europe / International Quantum Electronics Conference - Munich, Germany|
Duration: 12 May 2013 → 16 May 2013
|Conference||2013 Conference on Lasers and Electro-Optics Europe / International Quantum Electronics Conference|
|Abbreviated title||CLEO EUROPE/IQEC 2013|
|Period||12/05/13 → 16/05/13|
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Karakuzu, H., Dubov, M., & Boscolo, S. (2013). Control of the properties of micro-structured waveguides in LiNbO3 fabricated by direct femtosecond laser inscription. In 2013 Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference [Paper CE_8_3] IEEE. https://doi.org/10.1109/CLEOE-IQEC.2013.6800973