AI Article Synopsis
- Diffraction gratings, especially Multilayer Dielectric Diffraction Gratings (MDG), are increasingly used in lasers for improved optical performance.
- The study used Comsol MultiPhysics software to simulate a three-layer MDG structure with aluminum oxide sandwiched between silicon dioxide layers, achieving high diffraction efficiencies of 97.4%, 98.3% for TE polarization, and 96.3% for TM polarization at a wavelength of 1064 nm.
- The design enhances performance under high-intensity laser conditions by maximizing the electric field within materials with high laser damage thresholds, making it more stable than typical diffraction gratings.
Article Abstract
Diffraction gratings are becoming increasingly widespread in optical applications, notably in lasers. This study presents the work on the characterization and evaluation of Multilayer Dielectric Diffraction Gratings (MDG) based on the finite element method using Comsol MultiPhysics software. The optimal multilayer dielectric diffraction grating structure using a rectangular three-layer structure consisting of an aluminum oxide AlO layer sandwiched between two silicon dioxide SiO layers on a multilayer dielectric mirror is simulated. Results show that this MDG for non-polarized lasers at 1064 nm with a significantly enhanced -1st diffraction efficiency of 97.4%, reaching 98.3% for transverse-electric (TE) polarization and 96.3% for transverse-magnetic (TM) polarization. This design is also preferable in terms of the laser damage threshold (LDT) because most of the maximum electric field is spread across the high LDT material SiO for TE polarization and scattered outside the grating for TM polarization. This function allows the system to perform better and be more stable than normal diffraction grating under a high-intensity laser.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9227052 | PMC |
| http://dx.doi.org/10.3390/nano12121952 | DOI Listing |
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