In this paper, a newly developed system for simultaneously measuring five-degree-of-freedom errors of
machine tools is introduced. A single-mode fiber-coupled laser module is used to eliminate the beam drift
of the laser source. Only a cube corner retro-reflector and a beam splitter are adopted in the moving target
in order to sense the straightness errors and angle errors (pitch and yaw) respectively and simultaneously. A
special prism (including a beam-splitter facet and an all-reflecting facet) was adopted to measure the roll. A
simple common-path compensation method for laser beam drift is put forward, and a 2D position-sensitive
detector and a lens are used to monitor angular drift of the laser beam.
It is convenient to measure the parameters of the numerical control machine in workshop due to non-cable
connecting between moving target and measurement head. The error analysis and theory analysis of roll
which provide potent theoretical guidance in the future are given in detail.
Dispersion property is an important fact to generate white light. Different structures could change the dispersion
properties of fibers. This paper demonstrates how the white light was generated when the ultrashort pulse propagated in a
tapered fiber. We simulated how the supercontinuum was generated in a variety of tapered fibers which have different
parameters. The supercontinuum range could be reached from 680nm to1750nm. It is shown that the width and the shape
of the supercontinuum depend on both the fiber parameters such as the diameter or the length of tapered waist regime
and pulse peak power. The paper also discussed the influence of the different dispersion and nonlinear effects in detailed,
including GVD (Grouped Velocity Dispersion), SPM (Self Phase Modulation), TOD (Third Order Dispersion), SS (Self
Steeping), and SRS (Stimulated Raman Scattering). Through the numerical simulation, it presents when the ultrashort
pulse propagates in tapered fibers with anonymous dispersion, the Stimulated Raman Scattering effect plays an important
role in the long wave range of the supercontinuum. The influence of the higher order dispersion, especially third order
dispersion, on the anti-Stokes part in the supercontinuum process was also discussed. A smoother and broader
supercontinuum could be obtained after choosing the suitable parameters of the tapered optical fibers, especially the
diameter or the length of tapered waist regime.