Inscription of first order fiber Bragg gratings in sapphire fibers by 400 nm femtosecond laser pulses

Tino Elsmann; Tobias Habisreuther; Albrecht Graf; Manfred Rothhardt; Hartmut Bartelt

doi:10.1117/12.2016919

3 May 2013 Inscription of first order fiber Bragg gratings in sapphire fibers by 400 nm femtosecond laser pulses

Tino Elsmann, Tobias Habisreuther, Albrecht Graf, Manfred Rothhardt, Hartmut Bartelt

Proceedings Volume 8774, Optical Sensors 2013; 877406 (2013) https://doi.org/10.1117/12.2016919
Event: SPIE Optics + Optoelectronics, 2013, Prague, Czech Republic

Abstract

We demonstrate the inscription of fiber Bragg gratings in single crystalline sapphire using the second harmonic of a Ti:Sa-amplified femtosecond laser system. With the laser wavelength of 400 nm first order gratings were fabricated. The interferometric inscription was performed out using the Talbot interferometer. This way, not only single gratings but also multiplexed sensor arrays were realized. For evaluating of the sensor signals an adapted multimodal interrogation setup was build up, because the sapphire fiber is an extreme multimodal air clad fiber. Due to the multimodal reflection spectrum, different peak functions have been tested to evaluate the thermal properties of the grating. The temperature sensors were tested for high temperature applications up to 1200°C with a thermal sensitivity in the order of 25 pm/K which is more than the doubled of that one reached with Bragg gratings in conventional silica fibers.

Citation Download Citation

Tino Elsmann, Tobias Habisreuther, Albrecht Graf, Manfred Rothhardt, and Hartmut Bartelt "Inscription of first order fiber Bragg gratings in sapphire fibers by 400 nm femtosecond laser pulses", Proc. SPIE 8774, Optical Sensors 2013, 877406 (3 May 2013); https://doi.org/10.1117/12.2016919

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