Transcript Slide 1
Jennifer DeLeon Maui Community College Mentor: Nathan Sabin Advisor: Dan O’Connell 1 Make a set of 2 zoom lenses from SF-11. The lenses will be used together to adjust the divergence of a laser beam. 1. 2. 3. 4. 5. Edging Cutting the radius Grinding Polishing Testing Coating 2 generator body substrate hot plate 3 4 Put in generator, lens is centered, left to cool Cutting head adjusted to 35 degrees Reference cut made Subtract final diameter from measured and divide by 2 5 sag radius curvature center thickness lens diameter tool diameter 2 (radius curvature) [ (½]lens diameter) ANGLE = sin-1 2 SAG = MATERIAL TO = REMOVE 2 (radius curvature) current thickness - ( finished + tolerance + .5mm thickness 2 6 ) cutting head coolant line spindle 7 Measure lens surface w/ spherometer If radius is too steep or flat, make adjustments Take off remaining material for that side Reheat assembly, flip lens and repeat process 8 Grinding tools made in house Grooves allow compound and material to flow 30 micron = .150 mm, 12 micron = .075 mm, 5 micron = .025 mm Repeatedly tested with dial-meter and spherometer 9 Place the lens on a 3 point plane Use V-block to reference diameter and a dial-meter to test high spot Hand grind to within decentration tolerance 10 Polishers made with warm optical pitch After cooling, patterns are cut to allow compound and pitch to flow Polishing arm moves in several directions More of an art than an exact science Adjustments are made throughout process and lens is tested after each run 11 Interferometry = The use of an instrument that uses the interference of light waves to measure the accuracy of an optical surface 2 fringes = 1 wave deviation from desired (or test plate) radius The radius of curvature can be measured more accurately with a test plate than irregularity. Irregularity = Any distortion in the symmetry of the rings Also inspected with a loupe (magnifier) for any cosmetic blemishes 12 A set of two zoom lenses Meeting the cosmetic and fringe specifications and were sent out for coating When put together form a meniscus lens that diverges a laser beam When moved apart start to converge the laser beam In this way, they are used to adjust the divergence of a laser beam 13 The Akamai Interns Lowen Okamoto Darcy Bibb Jesse Brinkman Kenneth Estores Brylian Foronda David Kim Trent Kyono Jennifer Liem Shanoa Miller Nathaniel Salazar Tyson Seto-Mook Roxanne Yee Tyler Yoshiyama Jiaquan Zheng Suzanne Burns Hnu Photonics Team Including: Nathan Sabin Chris Taylor Dan O’Connell Sukumar Murali Center for Adaptive Optics Institute for Astronomy Lani LeBron Lisa Hunter Maui Community College Mark Hoffman Akamai Instructors Dave Harrington Ryan Montgomery Isar Mostafanezhad Mark Pitts Scott Seagroves Sarah Sonnet The Akamai Internship Program is funded by the Center for Adaptive Optics through its National Science Foundation Science and Technology Grant (#AST-987683) and by grants to the Akamai Workforce Initiative from the National Science Foundation and Air Force Office of Scientific Research (both administered by NSF,#AST-0710699) and from the University of Hawaii. 14