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Synopsis of Technical Report: “Lens Mounting Techniques”, P.R. Yoder Jr.

OPTI 521 – Fall 2008. Synopsis of Technical Report: “Lens Mounting Techniques”, P.R. Yoder Jr. Houssine Makhlouf December 8 th , 2008. Content. Techniques to mount individual lenses Analysis of stress in glass-metal interface Application to real systems Comments and conclusions.

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Synopsis of Technical Report: “Lens Mounting Techniques”, P.R. Yoder Jr.

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  1. OPTI 521 – Fall 2008 Synopsis of Technical Report:“Lens Mounting Techniques”, P.R. Yoder Jr. Houssine Makhlouf December 8th, 2008

  2. Content • Techniques to mount individual lenses • Analysis of stress in glass-metal interface • Application to real systems • Comments and conclusions

  3. Mounting individual lenses1/ Lens burnishing • Malleable material • Hardened tool pressing • Bent cell lip retains lens

  4. Mounting individual lenses2/ Snap ring • Groove inside cell • Insert fitting snap ring • Hard to remove • Quite permanent assembly

  5. Mounting individual lenses3/ Elastomer injection • Gap between lens and cell • Fill gap with resilient material • Hold lens axially • Inject and let cure

  6. Mounting individual lenses4/ Threaded retainer • Press lens against seat • Use threaded retaining ring • Holds lens firmly • Repeatable • Mount several elements in same housing

  7. Mounting individual lensesCut for seat and retainer • Square shape most common and easiest to machine, can be beveled to reduce nicks and burrs • Tangent to lens surface axial misalignment issue • Spherical with same radius of curvature as lens surface hard to make precisely and expensive

  8. Mounting individual lensesCut for seat and retainer

  9. Stress in glass-metal interface • Constrain lens position is important • Mounts cause stress • Stress depends on type of contact and temperature change • Tangential contact reduces dramatically preload stress • Models and formulas in Yoder’s paper

  10. Some real system designsMilitary use or severe environment

  11. Comments and Conclusion • Paper reports on lens mounting which is intended for all opto-mechanical scientists • Author computations show that special care about designs is really required for specific applications involving severe environment issues • Laboratory-type environment is pretty safe

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