Photonic crystal fiber Fabry-Perot sensor fabricated using femtosecond laser

A micro fiber-optic Fabry-Perot sensor was fabricated by using femtosecond laser micromachining in a photonic crystal fiber. The temperature and strain characteristics of the novel sensor were evaluated by experiment and a strain sensitivity of 0.0036 nm/and a linearity of 0.9989 for a strain range of 0-1500 were obtained. The temperature-to-cavity-length sensitivity is 0.958 nm/°C for a temperature range of -20 °C-100 °C. As this PCF F-P sensor can be mass-produced by simply using a femtosecond laser, it is anticipated that it can find wide applications in many fields.