Generating Lenses
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Jennifer DeLeon Maui Community College Mentor: Nathan Sabin Advisor: Dan O’Connell PowerPoint PPT Presentation


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Generating Lenses. Jennifer DeLeon Maui Community College Mentor: Nathan Sabin Advisor: Dan O’Connell. The goal of the project:. Edging Cutting the radius Grinding Polishing Testing Coating .

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Jennifer DeLeon Maui Community College Mentor: Nathan Sabin Advisor: Dan O’Connell

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Jennifer deleon maui community college mentor nathan sabin advisor dan o connell

Generating Lenses

Jennifer DeLeon

Maui Community College

Mentor: Nathan Sabin

Advisor: Dan O’Connell


Jennifer deleon maui community college mentor nathan sabin advisor dan o connell

The goal of the project:

  • Edging

  • Cutting the radius

  • Grinding

  • Polishing

  • Testing

  • Coating

Make a set of 2 zoom lenses from SF-11. The lenses will be used together to adjust the divergence of a laser beam.

Generating Lenses


Blocking up

Preparation:

Blocking Up

generator body

substrate

hot plate


Edging

Step 1:

Edging


Reference cut

Step 1:

Reference Cut

  • 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


Jennifer deleon maui community college mentor nathan sabin advisor dan o connell

Prep for

step 2:

sag

tool diameter

[ ]

(radius curvature)

radius

curvature

center

thickness

lens diameter

ANGLE =

sin-1

2

(½ lens diameter)2

SAG =

(radius curvature)

2

( )

current thickness

finished thickness

-

+ tolerance + .5mm

MATERIAL TO REMOVE

=

2


Cutting the radius

Step 2:

Cutting the Radius

cutting head

coolant line

spindle


Spherometer

Step 2:

Spherometer

  • 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


Grinding

Step 3:

Grinding

  • 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


Wedge correction

Step 3:

Wedge Correction

  • 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


Polishing

Step 4:

Polishing

  • 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


Testing

Step 5:

Testing

  • 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


Results

Results

  • 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


Special thanks

Special Thanks

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 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

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.


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