We report the generation of femtosecond Bessel beams of conical half-angle 26 degrees using an axicon lens and a beam reduc-tion imaging setup. The generated Bessel beams were applied to the micromachining of nanostructures in glass of length up to 100 µm. The effect of the incident pulse energy on the characteristics of the nano-structures was studied using optical microscopy.

In this paper we perform a simulation of fiber Bragg grating sensor with different grating lengths. It is shown that the grating length represents as one of the critical parameters in contributing to a high performance fiber Bragg grating sensor. The simulated fiber gratings with different lengths were analyzed and designed by calculating reflection and transmission spectra, and the bandwidth. Such simulations are based on solving coupled mode equations that describe the interaction of guided modes. The coupled mode equations are solved by the Transfer Matrix Method (a fundamental matrix method).

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