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3D adaptive spatio-temporal control of laser-induced refractive index changes in optical glasses

Abstract : The nonlinear optical absorption character has underlined the potential of ultrafast laser pulses for 3D processing of transparent materials, particularly for adding optical functions by refractive index engineering involving thermo-mechanical and structural rearrangements of the dielectric matrix. Nevertheless, challenges are related to the time-effectiveness of irradiation, correct beam delivery and the influence of material properties on the exposure results. Particularly for light-guiding applications, it is for example suitable to master positive refractive index changes in a time-efficient manner, where the result depends on deposited energy and its relaxation paths. To address these challenges several irradiation concepts based on adaptive optics in spatial and temporal domains were developed. We review here some of the applications from different perspectives. A physical aspect is related to time-synchronized energy delivery tuned on material transient reactions, enabling thus a synergetic interaction between light and matter and, therefore, optimal results. Examples will be given concerning refractive index flip in thermally expansive glasses by thermo-mechanical regulation, energy confinement by nonlinear control, accompanied by time-resolved investigations of the refractive index change. A second engineering aspect is related to processing efficiency. We give insights into 3D parallel complex photoinscription techniques and beam-delivery corrections utilizing dynamic wavefront engineering. Additionally, in energetic regimes ultrafast laser radiation can generate an intriguing nanoscale spontaneous arrangement, leading to form birefringence and modulated index patterns. Using the birefringence properties and the deriving anisotropic optical properties, polarization sensitive devices were designed and fabricated. The polarization sensitivity allows particular light propagation and confinement properties in 3D structures.
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Contributor : Razvan Stoian Connect in order to contact the contributor
Submitted on : Saturday, February 26, 2011 - 3:29:18 PM
Last modification on : Saturday, June 25, 2022 - 10:51:44 AM


  • HAL Id : ujm-00570073, version 1



Razvan Stoian. 3D adaptive spatio-temporal control of laser-induced refractive index changes in optical glasses. Photonics West 2011, Jan 2011, San Francisco, United States. ⟨ujm-00570073⟩



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