Development of a non-contact plasma processing technique to mitigate chemical network defects of fused silica with life enhancement of He-Ne laser device.
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| Title: | Development of a non-contact plasma processing technique to mitigate chemical network defects of fused silica with life enhancement of He-Ne laser device. |
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| Authors: | Dev, D. Sam Dayala1, Krishna, Enni1, Das, Manas1 manasdas@iitg.ernet.in |
| Source: | Optics & Laser Technology. May2019, Vol. 113, p289-302. 14p. |
| Subjects: | Plasma materials processing, Crystal defects, Fused silica, Helium, Neon, Laser beams, Raman microscopy |
| Abstract: | Highlights • Non-contact plasma process is adopted to remove atomic level defects in fine finished TIR optics. • Novel qualitative method using in-situ laser illumination is introduced for analysis of sub-micron cracks in optics. • Raman microscopy is identified for understanding chemical structure integrity of fused silica. • PSD characteristics of fused silica shows 80% reduction in higher spatial wave length after plasma processing. • Plasma processed optics enhances the life of the optical device significantly. Abstract Surface characteristic as well as bulk properties of optics play a significant role in the performance and the life of the optical device. In this paper a non-contact type plasma processing methodology is adopted to remove sub-micron cracks hidden under surface as generated due to contact mechanical processing. A novel qualitative method is introduced for analysis of sub-micron cracks present at the surface/sub-surface of the optics by using in-situ laser illumination. Raman microscopy is identified for understanding the improvement in chemical structure integrity of the fused silica. Power spectrum density characteristics of fused silica shows 80% reduction in higher spatial wave length after plasma processing which signifies improvement in surface figure. Life of the optical device is enhanced drastically by non-contact plasma processing methodology. The present study proposes a method for futuristic manufacturing of optics for achieving perfect surface structure without affecting surface roughness. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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