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Investigation of erbium-doped fiber laser intra-cavity absorption sensor for gas detection

Zhang, Y. and Zhang, M. and Jin, W. and Ho, H.L. and Demokan, M.S. and Culshaw, B. and Stewart, G. (2004) Investigation of erbium-doped fiber laser intra-cavity absorption sensor for gas detection. Optics Communications, 232 (1-6). pp. 295-301. ISSN 0030-4018

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Abstract

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.