Title of article :
GRADIENT-INDEX FIBRE BASED MINIATURE GAS CELL FOR INTRA-CAVITY FIBRE LASER SENSORS
Author/Authors :
LI, MO University of New South Wales - School of Electrical Engineering and Telecommunications, Australia , AZMI, ASRUL IZAM University of New South Wales - School of Electrical Engineering and Telecommunications, Australia , PENG, GANG-DING University of New South Wales - School of Electrical Engineering and Telecommunications, Australia
Abstract :
This paper presents a new and simple design of gas cell for the use of intra-cavity fibre laser sensors. This design utilizes gradient-index fibres for collimation to realize a miniature gas cell of very small diameter. By using the Gaussian field approximation and ray transformation, the gas cell is analyzed and optimized. It is found that gradient-index fibre based cells could achieve lower coupling loss of nearly 10 dB at a separation of 20 mm and allow for additional tolerance to certain misalignments, in comparison with those single-mode fibre based cells. A new-design cell is fabricated and its coupling loss is tested with a 1550 nm laser. Good agreement in the analysis and experimental results is obtained, indicating that the design could be feasible in practical gas sensing.
Keywords :
Gradient , index fibre based cell , gradient , index fibre collimator (GIFC) , coupling loss , misalignments , intra , cavity fibre gas sensor
Journal title :
Jurnal Teknologi :F
Journal title :
Jurnal Teknologi :F
