Fabrication of Tapered Circular Depressed-Cladding Waveguides in Nd:YAG Crystal by Femtosecond-Laser Direct Inscription
| Autor: | Javier R. Vázquez de Aldana, Feng Chen, Carolina Romero, Javier G. Ajates |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Fabrication
Materials science Physics::Optics 02 engineering and technology waveguide 01 natural sciences Article law.invention 010309 optics Crystal photonic device law 0103 physical sciences Electrical and Electronic Engineering femtosecond lasers Electronic circuit crystalline dielectrics business.industry Mechanical Engineering 021001 nanoscience & nanotechnology Cladding (fiber optics) Laser Control and Systems Engineering Femtosecond micro-processing Waveguide Optoelectronics Femtosecond lasers Photonics 0210 nano-technology business |
| Zdroj: | Micromachines Volume 11 Issue 1 GREDOS: Repositorio Institucional de la Universidad de Salamanca Universidad de Salamanca (USAL) GREDOS. Repositorio Institucional de la Universidad de Salamanca instname |
| ISSN: | 2072-666X |
| DOI: | 10.3390/mi11010010 |
| Popis: | Crystalline materials are excellent substrates for the integration of compact photonic devices benefiting from the unique optical properties of these materials. The technique of direct inscription with femtosecond lasers, as an advantage over other techniques, has opened the door to the fabrication of true three-dimensional (3D) photonic devices in almost any transparent substrate. Depressed-cladding waveguides have been demonstrated to be an excellent and versatile platform for the integration of 3D photonic circuits in crystals. Here, we present the technique that we have developed to inscribe tapered depressed-cladding waveguides with a circular section for the control of the modal behavior. As a proof of concept, we have applied the technique to fabricate structures in Nd:YAG crystal that efficiently change the modal behavior from highly multimodal to monomodal, in the visible and near infrared, with reduction factors in the waveguide radius of up to 4:1. Our results are interesting for different devices such as waveguide lasers, frequency converters or connectors between external devices with different core sizes. This research was funded by Consejería de Educación, Junta de Castilla y León, grant number SA287P18, and Ministerio de Economía y Competitividad, grant number FIS2017-87970R. F.C. thanks support from National Natural Science Foundation, grant number 61775120 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|