Steady state theoretical analysis of an erbium-doped fiber laser intra-cavity absorption sensor shows that high sensitivity can be achieved when the laser is working near threshold but is limited by the spontaneous emission. Experiments are carried out using a linear cavity fiber laser. The general trends of experimental results agree with the theoretical prediction. The use of the intra-cavity sensor for gas detection is demonstrated. A sensitivity of 91 times that of a single-pass absorption sensor is achieved.
- fiber optics sensors
- laser sensors
- absorption spectroscopy
- fiber optics
Zhang, Y., Zhang, M., Jin, W., Ho, H. L., Demokan, M. S., Culshaw, B., & Stewart, G. (2004). Investigation of erbium-doped fiber laser intra-cavity absorption sensor for gas detection. Optics Communications, 232(1-6), 295-301. https://doi.org/10.1016/j.optcom.2004.02.046