CO2 laser induced long period gratings in optical microfibers.

@article{Xuan2009CO2LI,
  title={CO2 laser induced long period gratings in optical microfibers.},
  author={Haifeng Xuan and Wei Jin and Min Zhang},
  journal={Optics express},
  year={2009},
  volume={17 24},
  pages={21882-90}
}
Long period gratings (LPGs) are fabricated by use of focused high frequency CO(2) laser pulses to periodically modify the transverse dimension of silica microfibers. A 20-period LPG with a 27 dB attenuation dip is realized in a microfiber with a diameter of approximately 6.3 microm. The resonant wavelength has a negative temperature coefficient and a high sensitivity to external refractive index. The microfiber LPGs may be useful in micron scale in-fiber devices and sensors. 
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