Preliminary Design Review
Blake Ipson
John Chen
Matt Graeff
Steven Benedict
Weston Welge
Team PhotoCon
EXPO Lab
Department of Electrical, Computer, and Energy Engineering
University of Colorado at Boulder
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

John
Prototype a fast, high-resolution lithography
system
Eventual use in Extreme Polymer Optics
(EXPO) Lab
Applications in medical endoscopy,
holographic data storage


Accepts file of input vectors or coordinates,
modulates laser diode power for “even” beam
power
Draw 2D images of ~3.5 mm scale on a CMOS
camera
◦ End goal of drawing 3D images in a polymer sample
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Implement a single drawing method, but
expandable if desired
◦ Draw using dots or vectors
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John
Images accurate to one-tenth of the focused spot
size (~15 μm)
Stand-alone and “transportable”
◦ User needs only a PC and 120 V wall power supply
John
Weston
Camera
MT9M001
6.66 x
5.32 mm
Objective
PAC016
f ~ 25 mm
Galvanometer
• Mirror tilt restricted to ~2o or optical tilt of up to ~4o
• Range on camera of ~3.5 mm
• Simulation from Zemax
Weston
Collimator
A390
f ~ 4.6 mm
Camera
MT9M001
6.66 x
5.32 mm
Objective
PAC016
f ~ 25 mm
Galvanometer
Collimator
A390
f ~ 4.6 mm
Weston
• Pigtailed laser diode
2wLD =2.9 mm mode diameter, NALD = 0.12 , λ=405nm
• Connectorized, adjustable collimation
lenses
Focal length fcol = 4.6 mm
• Galvo scanner
dq = 15 mrad repeatability
• CMOS camera
6.66 x 5.32, 5.2 mm pixels
Weston
From
Laser
To Laser
Determine
Drawing
Method
Power
Modulation
Microcontroller
Velocity/
Position
Calculation
From
Galvanometer
Steven
Vector
Parsing
To
Galvanometer
Memory
(User Input)
From
PC
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Need to parse floating point
vectors/coordinates
Need to run computations on floating point
acceleration, velocity, position, and power
values from galvo and laser
Must be able to add additional sensors to
system for future research
Must be able to store vector files and other
user input in memory
Steven

User loads drawing instruction file
(coordinates/vectors) to system through
command line interface on PC
◦ Additional commands used to open/close shutter,
adjust component settings

Output displayed on PC monitor using CMOS
camera software
Steven
Task
Blake
John
Matt
Optics
X
X
X
Laser diode
X
X
X
Interface
X
X
X
X
Power Supply
PC interface
Documentation
Blake
X
X
Microcontroller PCB layout
MATLAB Pre-processing
X
X
Camera/Polymer
Electronics
X
X
Galvanometer
Weston
X
X
Collimation
Scanning Lens
Steven
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Blake
Blake
Component
Cost
Laser Diode
$600
Laser Power Supply
$0*
Galvo System
$2000
Objective Lens
$150-1000
Collimating lens
$225
Miscellaneous Optics
$0*
Optics Breadboard
$0*
CMOS camera
$0*
EXPO Budget
$3825
*Provided by EXPO
Blake
Component
Cost
Microcontroller
$150
Microcontroller
Evaluation Kit
$300
Passive Components
$100
Power Electronics
$100
PCB Fabrication
$150
UROP Budget
$800

Availability/lead time of galvanometer,
laser, microcontroller, etc…
◦ Prepare list of back-up components
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Galvanometer speed inconsistent, unreliable
◦ Compensate with real-time system calibration in
software
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Loss of calibration over time
◦ Mechanically isolate optical system to prevent
ambient vibrations from interfering with calibration
Matt

Unfamiliar with microcontrollers, servo
driver
◦ Adjust schedule as necessary to increase time spent
on microcontroller programming/interfacing
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Work time lost due to unforeseen
circumstances
◦ Schedule ambitious deadlines to allow for lost work
time
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Damaged/nonfunctional components
◦ Test components when they arrive to guarantee
they work correctly
Matt
When all else fails:
Blame Trevor
Matt