Inscription of micro/nano structures in functional crystalline materials by femtosecond laser illumination

Mohammad Ahsanul Kabir; Kaicheng Wu; Kai-Ting Chou; Stuart (Shizhuo) Yin

doi:10.1117/12.3027559

30 September 2024 Inscription of micro/nano structures in functional crystalline materials by femtosecond laser illumination

Mohammad Ahsanul Kabir, Kaicheng Wu, Kai-Ting Chou, Stuart (Shizhuo) Yin

Author Affiliations +

Proceedings Volume 13140, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XVIII; 1314006 (2024) https://doi.org/10.1117/12.3027559
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

In this paper, we report how to use femtosecond laser illumination to inscribe micro/nano structures, particularly the permanent periodic refractive index change/modulation in functional crystalline materials, such as lithium niobate and Ti: sapphire crystals. First, we introduce the motivations to create micro/nano structures in functional crystalline materials, which include the enhancement of light and material interaction, leading to new functionalities such as a spectrally tunable electro-optic device. Second, we discuss the physical mechanism of femtosecond laser illumination induced permanent refractive index change. The extreme high light intensity at the focusing spot of femtosecond laser beam can induce a rapid melting/re-solidification process in the functional crystalline materials, consequentially generating a permanent refractive index change in these materials via Kovacs effect. Third, we provide a detailed description of the experimental setup and procedure used to inscribe permanent periodic refractive index modulated patterns in functional crystals. We use the direct femtosecond laser writing method due to its simplicity and versability. Fourth, we discuss the experimental results confirming that we can indeed inscribe permanent periodic refractive index change in functional electro-optic lithium niobate crystals and the Ti: sapphire lasing medium. Finally, we will conduct and report experimentations to confirm the applications of micro/nanostructured functional crystalline materials in highly compact and fast-speed tuning lasers and spectral filters in future.

Conference Presentation

Citation Download Citation

Mohammad Ahsanul Kabir, Kaicheng Wu, Kai-Ting Chou, and Stuart (Shizhuo) Yin "Inscription of micro/nano structures in functional crystalline materials by femtosecond laser illumination", Proc. SPIE 13140, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XVIII, 1314006 (30 September 2024); https://doi.org/10.1117/12.3027559

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