Abstract
A novel intra-cavity sensor based on a dual-wavelength Er-doped fiber laser is proposed. The output power characteristics of the laser are investigated experimentally, and the sensitivity of power to relative cavity loss with different pump currents is studied by defining a sensitivity enhancement factor (SEF). A measurement of the relative sensitivity enhancement of 158.5 is obtained. Moreover, we used such a sensor to measure the absorption peak of NH3 with a 2 m long hollow core photonic crystal fiber as a gas cell.
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