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Download PDF by Alwyn T. Lloyd: B-52 Stratofortress: In Detail and Scale

By Alwyn T. Lloyd

ISBN-10: 0830680373

ISBN-13: 9780830680375

ISBN-10: 1853106046

ISBN-13: 9781853106040

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Additional info for B-52 Stratofortress: In Detail and Scale

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The resulting focus shift depends almost linear on the nominal focal position, which can be corrected by appropriate scaling of the 3D structure. However, one important issue is the loss of the axial symmetry with respect to the main maximum of the focus. In confocal microscopy this leads to a difference in the resulting image when focusing above or below a fluorescent specimen. The loss of axial and vertical resolution and more importantly the drastic reduction of laser intensity have a huge impact on direct laser writing.

The loss of axial and vertical resolution and more importantly the drastic reduction of laser intensity have a huge impact on direct laser writing. 47) at a nominal focus position of 50 µm [77]. However, the intensity of a fluorescence signal, which indicates the absorption rate of the photoactive dye, dropped to 30 % of the original value. Compared to confocal microscopy this effect is less drastic in direct laser writing, since the point spread function of the observation system is negligible.

Another possibility is the reduction of the nominal focal position. This technique is wide spread among laboratories performing direct laser writing. For high resolution structures, the structure is built from the bottom to the top, with the laser beam entering the material from the bottom. By this means, the realization of high structures poses a problem, since spherical aberration increases with increasing structure height. Additionally, refractive index 32 S. Engelhardt Fig. 6 at a nominal focus position of 100 µm.

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B-52 Stratofortress: In Detail and Scale by Alwyn T. Lloyd


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