Abstract
A miniature in-line fiber-optic Fabry–Perot etalon is fabricated on a photonic crystal fiber (PCF) by using laser micromachining for the first time to our knowledge. Experimental results show that such a PCF-based etalon has an excellent fringe visibility of up to due to the mirror-finish quality of the two cavity surfaces inside the PCF. This etalon can be used as an ideal sensor for precise strain measurement under high temperature of up to . It can also offer some other outstanding advantages, such as fast and easy fabrication, high reproducibility, capacity of mass production, low cost, low temperature–strain cross-sensitivity, and high signal-to-noise ratio.
© 2007 Optical Society of America
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