Analysis of the refractive index change of optical waveguide in LiNbO3 using a femtosecond laser

Shi-han Yang; Liang Zhang; Xue-song Lin; Jie Feng; Zi-gang Zhou; Jang-jun Chen

doi:10.1117/12.2071696

18 November 2014 Analysis of the refractive index change of optical waveguide in LiNbO₃ using a femtosecond laser

Shi-han Yang, Liang Zhang, Xue-song Lin, Jie Feng, Zi-gang Zhou, Jang-jun Chen

Proceedings Volume 9266, High-Power Lasers and Applications VII; 92661L (2014) https://doi.org/10.1117/12.2071696
Event: SPIE/COS Photonics Asia, 2014, Beijing, China

Abstract

We used a commercially available 75 MHz regeneratively amplified laser system emitting 50 femtosecond pulses of energies up to 3nJ at a wavelength of 800 nm. All waveguides were fabricated by focussing the femotsecond pulse train polarised parallel to the x-axis to a distance of approximately 125 μm below the sample surface using a 0.65 NA, ×40 microscope objective and translating the sample along the y axis. To find the optimum waveguide fabrication parameters the translation speed was varied from 2 to 100 μm/s. We introduces a method of measuring the refractive index of optical waveguide in ten micrometer. Useing CCD to measure the two-dimensional near-field light intensity distribution of the output cross-section of the waveguide, by measuring the two-dimensional near-field light intensity distribution of the output cross-section of the waveguide can be calculated the two-dimensional distribution of refractive index of waveguides. The context detailedly gives measurement results about femtosecond laser inducing the near-field intensity of lithium niobate optical waveguide cross-section and calculations of refractive index of optical waveguide. The results show that the refractive index of waveguides showed a large central, gradually reduce and the change of refractive index in the range of 0.001. This method is of great significance to measure the optical waveguide refractive index distribution.

Citation Download Citation

Shi-han Yang, Liang Zhang, Xue-song Lin, Jie Feng, Zi-gang Zhou, and Jang-jun Chen "Analysis of the refractive index change of optical waveguide in LiNbO₃ using a femtosecond laser", Proc. SPIE 9266, High-Power Lasers and Applications VII, 92661L (18 November 2014); https://doi.org/10.1117/12.2071696

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KEYWORDS

Waveguides

Refractive index

Femtosecond phenomena

Lithium niobate

Near field

Optical testing

Microscopes

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