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Design of optical relay systems
Lens design Opti 517Jose Sasian
College of Optical SciencesUniversity of Arizona
Tucson, Arizona 85721USA
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Overview
• Introduction• Relays for free-space photonic switching• Relays for micro-lithography• Relays for periscope systems• Relays for photographic systems• Conclusions
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Introduction
• Illustrate several optical relays• Illustrate how ‘experience’ is gained• Show a number of lens design insights
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Photonic switching relay
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Objective
• External stop• Telecentric• F-sin(theta)
mapping• f/1.5• F=15 mm• Fov +/- 3.5 deg• @ 850 nm
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Lens forms
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Photonic Switching system
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Single stage photonic switch
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Single stage photonic switch
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Relays for periscope systems
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Requirements
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Periscope designs
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Design results
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Periscope designs
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Final solution
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Relays for photography
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Relays for photography
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Chromatic correction
BK7 & F2
f/4, f=100 mm
KZFS1TIF6PSK53AFPL53
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Actual system
From Ronchigram simulation From changing the Abbe number by 3
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Relays for telescope systems
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Layout of Original System
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Re-designed system
All off-the-shelf optics
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Actual tough and easy designs(specs understanding)
Coma sensitivity 0.54Astigmatism sensitivity 0.78
Coma sensitivity 0.14Astigmatism sensitivity 0.21
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Alignment Challenge
• All off-the-shelf components ~70 surfaces• Laser to establish optical axis• Point sources at wavelength• Ronchi grating• CCD images and then projected images
• Obtain near diffraction limited spots at about 1.7 to 2 pixels. (DF ~ 1 pixel)
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Alignment
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Conclusion
• Several relay systems and a number of insights:
• Best form for four element lens• Clever use of prisms• Clever use of glass location• Use of off-the-shelf lenses