Referencia de frecuencia óptica estabilizada a una transición D2 de Rubidio controlada por un módulo de lock-in desarrollado en FPGA

M. Luda, J. Codnia


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Información básica

Volumen

V51 - N1 / 2018 Ordinario

Referencia

49037:1-11

DOI

http://doi.org/10.7149/OPA.51.1.49037

Idioma

English

Etiquetas

ECDL, lock-in, Rubidio.

Resumen

La modulación y demodulación lock-in es utilizada con frecuencia para la estabilización de la longitud de onda de emisión de un láser sintonizable en laboratorios de metrología, espectroscopia, física atómica y óptica cuántica. En particular, la estabilización a una transición atómica particular es utilizada para generar patrones de frecuencia óptica de referencia. En este trabajo se presenta el desarrollo de un módulo de estabilización con tecnología de electrónica programable FPGA (del inglés, Field Programmable Gate Array) que permite realizar la modulación a frecuencia f y demodulación lock-in en frecuencias f y 3f. El módulo es económico, versátil y se puede controlar remotamente usando una plataforma de Software Libre. Se probó el desempeño del sistema estabilizando un láser sintonizable por cavidad externa (ECDL, del inglés External Cavity Diode Laser) a una de las transiciones hiperfinas del Rubidio (Rb), logrando una desviación estándar en la frecuencia óptica del orden de los 100 kHz, equivalentes a una estabilidad 2.6 10-10.

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