Optomechanics Lab Presentation OPTI 521L, Fall 2015 Daniel Millstone Kerry Nierenberg
Recall Lab 2 Alignment telescope – 4F system Defined an optical axis Found optical C of Cs Ended up with properly aligned lens(es)
Recall Lab 3 Air-bearing as datum PSM as reference beam Find optical axis Co-align lens to datum Use different degrees of freedom for different optical surfaces
Goal Create a system that can replicate the behavior of a lens alignment station, alignment telescope, and autocollimator Minimize cost Reduce size of instrument Use off the shelf parts Initial design to prove function
Alternative Design Cage plates Source (Fiber-Coupled) Shear Plate & Mirror Afocal Relay(s) Beamsplitter CCD
How it Works - Flat Surface
Why This Design? Affordable Pre-constrained design Compact Integrated Highly Adjustable (Afocal Relay) Multi-functional – Alignment Telescope – PSM – Autocollimator
Cost Analysis - Breakdown ITEMPART NUMBERCOSTQUANTITYTOTAL 1'' Kinematic MountKM100$38.703$ /2'' Translating Post Holder PH2T$55.602$ /2'' Optical PostTR2$5.193$ /2'' Translation StageMT1$ $1, CCD CameraPoint Grey Flea3$ AutocollimatorDavidson$1, PSM- - -$2, Air Bearing System- - -Thousands1 PRECISION METHOD
Cost Analysis - Breakdown ITEMPART NUMBERCOSTQUANTITYTOTAL 1'' Cage MountCP02$ $ '' Cage Assembly RodSR8$ $ BeamsplitterCM1-BP1$ Lens TubeSM05M30$ /2“ Optical PostTR2$5.194$20.76 CCD CameraPoint Grey Flea3$ Round Silver MirrorPF10-03-P01$ Shear PlateSI500P$ LensesLA1608$21.204$84.80 CAGE PLATE METHOD
Total Cost Precision Method > $10, Cage Plate Method ~ $
Pre-Constrained Design Limited degrees of freedom (cage plates) Only allows for desirable motion 4-cone mount for repeatable and kinematically controlled system rotation
Compact / Integrated If space were an issue…what would you rather work with? Linear Stage / Air Bearing – At LEAST 2m tall OR Our System – Portable (Easily Handled) – 0.5m long
Highly Adjustable Variable relay system Cage plates allow: – Movement of lenses – Switching lenses out easily Source easily changed
Multiple Functions Alignment Telescope PSM Autocollimator
Demo
Issues with the Design HIGHLY aberrated Over constrained Manually adjusted for focus Long lever arm could induce tilt/decent of lenses Precision of system is based on the manufacturing tolerances of cage plate and lens tube Issues with “point contact” for rotation
Concave Surface
Convex Surface
Flat Surface
Concave Surface – Aspheric System
Convex Surface – Aspheric System
Flat Surface – Aspheric System
Conclusion Functional System Less expensive Not as high precision Definitely room for improvement
References Oh, Chang, and Jim Burge. Introduction to Optomechanical Engineering Lab. Lectures 2, 3. Special thanks to: Matt Dubin, Laura Coyle for their previous work on similar topics Dr. Oh and Chase Salsbury for their help this semester
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