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Diamond Radiator Thinning Using an Excimer Laser (view source)
Revision as of 15:33, 23 April 2010
, 15:33, 23 April 2010→Updates for April 2010
*A fluorine resistant regulator will be purchased by the first week in April.
*A fluorine resistant regulator will be purchased by the first week in April.
==Updates for April 2010==
==Updates for April 2010==
*A FORTRAN program has been written which simulates rays exiting the laser aperture and then focused through a fused silica lens. We are able to determine the smallest spot size attainable as a function of the distance away from the lens and fit the x y projections with Gaussian approximations as shown below.
*A FORTRAN program has been written which simulates rays exiting the laser aperture and then focused through a fused silica lens. We are able to determine the smallest spot size attainable as a function of the distance away from the lens.
[[File:r0(2)r0(1).jpg|left|thumb]]
[[File:r0(2)r0(1).jpg|right|thumb|Original Beam Profile]]
[[File:r1(2)r1(1).jpg|right|thumb|Focused Beam Profile]]
*Taking the X and Y projections of the focused beam and fitting them with a Gaussian distribution, we are able to attain the <math>\sigma_{X}\,</math> and the <math>\sigma_{Y} \,</math>.
*Assuming a Gaussian distribution at the waist of the beam, we now find the FWHM (full width at half maximum) by the following relation, <math>\mathrm{FWHM} = 2 \sqrt{2 \ln 2}\ \sigma. </math>
*The smallest value of <math>\mathrm{FWHM_{X}}</math> and <math>\mathrm{FWHM_{Y}}</math> were 1.49mm and 0.552mm respectively.
*The Rayleigh Length,<math>\mathrm{Z_{R}}</math> is defined as the distance from the beam waist along the axis of propagation to the point where its cross section is doubled. Taking <math>\mathrm\omega_{0}</math> as the beam waist, and using the <math>\mathrm{FWHM}</math> as its value we are looking for the point where <math>\mathrm{FWHM} = 2 \sqrt{2 \ln 2}\ \omega_{0}. </math>