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 Preliminary Design Review

 Prototype a fast, high-resolution lithography system  Eventual use in Extreme Polymer Optics (EXPO) Lab  Applications in medical endoscopy, holographic data storage John

 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  Implement a single drawing method, but expandable if desired ◦ Draw using dots or vectors  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

Collimator A390 f ~ 4.6 mm Objective PAC016 f ~ 25 mm Camera MT9M x 5.32 mm Galvanometer Mirror tilt restricted to ~2 o or optical tilt of up to ~4 o Range on camera of ~3.5 mm Simulation from Zemax Weston

Collimator A390 f ~ 4.6 mm Objective PAC016 f ~ 25 mm Camera MT9M x 5.32 mm Galvanometer Weston

Connectorized, adjustable collimation lenses Focal length f col = 4.6 mm Galvo scanner  = 15  rad repeatability CMOS camera 6.66 x 5.32, 5.2  m pixels Pigtailed laser diode 2w LD =2.9  m mode diameter, NA LD = 0.12, λ=405nm Weston

Microcontroller Steven Vector Parsing Memory (User Input) Power Modulation Velocity/ Position Calculation Determine Drawing Method To Laser From Laser From PC To Galvanometer From Galvanometer

 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

Blake

*Provided by EXPO Blake

 Availability/lead time of galvanometer, laser, microcontroller, etc… ◦ Prepare list of back-up components  Galvanometer speed inconsistent, unreliable ◦ Compensate with real-time system calibration in software  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  Work time lost due to unforeseen circumstances ◦ Schedule ambitious deadlines to allow for lost work time  Damaged/nonfunctional components ◦ Test components when they arrive to guarantee they work correctly Matt

When all else fails: Blame Trevor