Characterizing Lenslet Arrays for the Keck Adaptive Optics System Laboratory for Adaptive optics (LAO) UC Santa Cruz Name: Abubakarr Bah Home Institution:

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Presentation transcript:

Characterizing Lenslet Arrays for the Keck Adaptive Optics System Laboratory for Adaptive optics (LAO) UC Santa Cruz Name: Abubakarr Bah Home Institution: Santa Rosa Junior College Advisor: Dr. Don Gavel Mentor: Dr. Renate Kupke

2 What are Lenslets? Small lenses (50 um- 1 mm) Part of an array. Found in Shack-Hartmann wave front sensors. Image taken from Lenslet on a Shack-Hartmann wavefront sensor

3 My Project Information Characterizing Lenslets arrays for the Keck adaptive optics system: Focal Length Pitch Measurement Transmission Lenslet Optical Figure

4 Focal length setup CCD Pinhole (5 µ).633 um f Microscope Objective (10x) Microscope Objective (50x) Diode laser Aperture Collimated light Lenslet Computer Hartmann Spots

5 Focal length at a single wavelength (.633 um) Array Focal length spec. (mm) Focal length Meas. (mm) Depth of focus (uncertainty) A4.9 ± ± 0.39 B3.1 ± ±0.17 C2.4 ± ±0.11

6 Focal length set up for different Wavelength. White light Source CCD Lenslet Microscope Objective (10x) Computer Microscope Objective (50x) Filter

7 Wavelength Focal length A Focal Length B Focal length C Focal length at diff. wavelength

8 Pitch Measurements: Spot Pitch Measurements: - Same as Focal Length Setup - Distance b/w Spots Pitch Measurements: - LAO's Olympus microscope - 20 Lenslet at a time

9 Focal Spot Pitch Lenslet Focal Spot Pitch Spec (mm) Focal Spot Pitch Meas. (mm) RMS Error A ± B ± C ±

10 up= towards lenslet III Right= towards markings. Pitch Measurements Using the LAO's Olympus microscope Measurements were taking 20 lenslet at time lenslet Up (mm) Down (mm) Right (mm) Left (mm)RMS Error A ± B ± C ±

11 Transmission of the Lenslets: Keck Specification: >97 % EXPERIMENTS: Used The UCO Lick Optical Shop's spectrophotometer. Made a simple optical setup

12 Throughput. White light Source FilterLenslet Photometer Pin Hole

13 Min 0.84 Max 1.00 Transmission of Lenslet:

14 Lenslets optical Figure:

15 Conclusions:. Focal length and Pitch meet specifications.Transmission meets the specifications within nm. Lenslet has a parabolic shape and steps patterns (surprising observation !)

16 Acknowledgments Dr. Don Gavel Dr. Renate Kupke Sandrine Thomas Daren Dillon Marco Reinig Members of the LAO lab Center for Adaptive Optics (CFAO) This work has been supported by the National Science Foundation Science and Technology Center for Adaptive Optics, managed by the University of California at Santa Cruz under cooperative agreement No. AST "