Abstract
The fourth-order PSFBGs with the phase-shift values of π/2, π and 3π/2 are realized by line-by-line (LbL) technique with a femtosecond laser. The birefringences of the two LbL-inscribed PSFBGs are measured to be 2.0×10−4, 2.4×10−4, respectively.
© 2015 Optical Society of America
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