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¿Puede el bombeo de conversión ascendente iniciar el colasing en medios de ganancia similares al bombeo convencional?
Optics letters
|August 29, 2025
Resumen
Este estudio compara el bombeo convencional y de conversión ascendente para láseres de tulio (Tm3+), encontrando que el colasing es alcanzable a 2 μm y 2,3 μm. Una concentración crítica de iones determina cuál es la longitud de onda por primera vez.
Área de la Ciencia:
- Física del láser
- Ciencias de los materiales
- La electrónica cuántica
Sus antecedentes:
- Los láseres dopados con tulio (Tm3 +) son cruciales para generar radiación infrarroja media.
- El colasing en láseres Tm3+ ofrece una salida ajustable, pero requiere comprender complejos mecanismos de transferencia de energía.
- Los sistemas de bombeo convencionales y de conversión ascendente presentan diferentes vías para lograr la acción láser.
Objetivo del estudio:
- Comparar teóricamente los umbrales y las eficiencias del bombeo convencional y de la conversión ascendente en láseres Tm3+.
- Para investigar el fenómeno de las colases cerca de 2 μm y 2,3 μm.
- Desarrollar un modelo que prediga el inicio del láser en longitudes de onda específicas basadas en la concentración de iones Tm3+.
Principales métodos:
- La formulación de la ecuación de velocidad se empleó para modelar la dinámica del láser.
- Se derivaron ecuaciones de ganancia de potencia acopladas, que incorporan la relajación cruzada (CR) y la conversión ascendente de la transferencia de energía (ETU).
- Se obtuvieron soluciones analíticas para los umbrales de lasing y las eficiencias en el régimen de colasing.
Principales resultados:
- Se logró el colasing y se validó con datos experimentales para los láseres Tm3+:YLF con bombeo convencional.
- Las potencias de salida en longitudes de onda de 2 μm y 2,3 μm mostraron una dependencia lineal de la potencia de la bomba en el régimen de colasing.
- Las condiciones analíticas se derivaron para determinar la secuencia de lasing entre las dos longitudes de onda.
Conclusiones:
- Tanto el bombeo convencional como el de conversión ascendente pueden lograr efectivamente el colasing en los láseres Tm3+.
- El modelo predice con precisión las observaciones experimentales, destacando la importancia de CR y ETU.
- Se identificó una concentración crítica de iones Tm3+, que dicta la longitud de onda de láser inicial (2,3 μm o 2 μm).
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