Ultra-high resolution dual comb spectroscopy based on gainswitching optical frequency combs

• Clara Quevedo-Galán ^[1] ; Alejandro Rosado ^[1] ; Laura Monroy ^[1] ; Pablo López-Querol ^[1] ; Antonio Pérez-Serrano ^[1] ; José Manuel G. Tijero ^[1] ; Ignacio Esquivias ^[1]
  1. [1] Universidad Politécnica de Madrid

     Universidad Politécnica de Madrid

     Madrid, España

     
• Localización: Conectando la academia y la industria: Libro de actas OPTOEL 2023 / coord. por Alejandro Carballar Rincón, María del Rosario Fernández Ruiz, 2024
• Idioma: inglés
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• Resumen

  • This paper briefly describes the generation of very low repetition rate optical frequency combs and the implementation of a high-resolution dual comb spectroscopy system based on them. The optical frequency combs are generated by pulsed gain-switching of commercial laser diodes under optical injection in a master-slave configuration. As application examples, we show the spectrum of the CO2 absorption line at 1572.02 nm recorded with a 100 MHz resolution, and, as the most relevant result, the reflection profile of a Fabry-Perot filter measured with an ultra-high resolution of 4 MHz.