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

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

Mounting individual lenses 1/ Lens burnishing Malleable material Hardened tool pressing Bent cell lip retains lens

Mounting individual lenses 2/ Snap ring Groove inside cell Insert fitting snap ring Hard to remove Quite permanent assembly

Mounting individual lenses 3/ Elastomer injection Gap between lens and cell Fill gap with resilient material Hold lens axially Inject and let cure

Mounting individual lenses 4/ Threaded retainer Press lens against seat Use threaded retaining ring Holds lens firmly Repeatable Mount several elements in same housing

Mounting individual lenses Cut 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

Mounting individual lenses Cut for seat and retainer

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

Some real system designs Military use or severe environment

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