| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Tunable Direct Writing of FBGs into a Non-Photosensitive Tm-Doped Fiber Core with an fs Laser and Phase Mask |
| SONG Cheng-Wei1, ZHANG Yun-Jun2, WANG Yang1, JU You-Lun2 |
| 1School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 1500012National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001 |
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| Cite this article: |
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SONG Cheng-Wei, ZHANG Yun-Jun, WANG Yang et al 2009 Chin. Phys. Lett. 26 094204 |
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Abstract Fiber Bragg gratings (FBGs) are successfully written in a non-photosensitive Tm-doped single-mode fiber by a 800nm fs laser and a 2.7μm period phase mask. The intra-core FBGs are written using the phase mask ±1 order interference, and have a period of 1.35μm, which responds to the second-order reflective central wavelength at 1946.4nm. Based on the magnification tuning writing technology, the tunable writing technology is also experimentally investigated. The distance between the phase mask and the fiber, between the phase mask and the tuning lens, and the focal length of the tuning lens all have an influence on the tunable characteristics. Four different FBGs tuning reflective central wavelengths located at 1958.7nm, 1970.8nm, 1882.5nm and 1899.7nm are obtained.
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| Keywords:
42.55.Wd
42.81.Qb
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Received: 07 April 2009
Published: 28 August 2009
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