UV exposure illumination systemsPalo Alto, California

UV ILLUMINATION / HOMOGENIZATION / EXPOSURE

Uniform UV exposure from source package to substrate plane.

PAO engineers collimated, telecentric, and homogenized UV illumination for process equipment, with radiometry, thermal behavior, alignment, and production verification designed in from the start.

Review a UV illumination requirement Review engineering scope

01UV source

02Collection

03Homogenization

04Pupil control

05Work plane

365, 385, and 405 nm architectures for compact through large-area exposure.

01Engineering reality

Uniformity on a drawing is not uniformity in the process.

Source aging, angular content, working distance, spectral response, thermal shift, contamination, substrate topography, and the measurement method determine whether an exposure field is useful.

Radiometric closure

Translate source output into dose, irradiance, uniformity, and throughput at the actual working plane.

Angular and spatial control

Engineer collimation, telecentricity, pupil fill, edge roll-off, and field mixing for the process.

Repeatable verification

Define warm-up, mapping grid, detector, calibration, sampling, and acceptance conditions.

02Project fit

PAO supports teams that need dependable UV exposure performance, not a catalog spec list.

Use PAO when exposure source, optical geometry, angular control, and measurement protocol must be closed together before procurement.

Uniformity is not reliable at production scale

Lab-level values look good, but edge roll-off, source drift, or thermal change causes field variation across real jobs.

Vendor proposal needs optical risk retirement

You need help translating process specs into required source coupling, mapping, acceptance method, and verification coverage.

You need a design-to-supplier path

A UV subsystem exists but still needs BOM structure, qualification criteria, change log, and acceptance package for build.

ENGINEERING DECISION TABLE

Inputs that change the architecture, acceptance method, and program risk.

Input condition	Key metric	Design choice	Risk if unresolved
Wavelength and resist chemistry	Dose response, contrast, line edge quality, spectral stability	365/385/405 architecture, filter set, source drive mode, duty cycle	Incorrect spectral assumptions can reduce feature transfer and process consistency.
Working distance and field	Edge roll-off, uniformity curve, irradiance spread	Collimation, telecentric target, pupil shaping, homogeneity architecture	Non-closed geometry causes under- or over- exposure at edges.
Thermal and contamination conditions	Temperature drift, optical transmittance, particulates	Thermal loop, cooling path, shielding strategy, cleaning protocol	Performance shifts after long-cycle operation and field returns.
Verification and acceptance method	Mapping repeatability, sample size, defect threshold	Grid density, sampling standard, correction plan, acceptance limits	Supplier handoff misses repeatability and quality controls.

SELECTED ENGINEERING EVIDENCE

Published scope, verification method, and disclosure boundary.

These records describe documented engineering experience or the evidence plan PAO uses for new work. They do not imply that prior-employer programs were PAO customer engagements.

UV exposure qualification approach

Scope: System-level illumination design, thermal model, mapping plan, and acceptance method used for pilot builds.
Verification: Uniformity targets are reported with detector and working-distance context under defined warm-up and correction settings.
Boundary: Performance data shown for specific programs is not shared publicly.

Review UV uniformity methods

Procurement-ready release structure

Scope: Controlled BOM, drawing, interface, and acceptance package for supplier build-up and qualification.
Verification: Package quality is validated through revision traceability, acceptance criteria, and test evidence.
Boundary: Costs and schedule assumptions are tied to supplier response and available process data.

View RFQ technical package guide

03Engineering scope

A complete illumination workstream, not a source selection exercise.

PAO connects optical design to thermal, mechanical, electrical, process, and metrology constraints.

Define a technical work package

Requirements and dose budget

Exposure area, wavelength, irradiance, uniformity, angle, working distance, duty cycle, and throughput.

Source integration

LED, laser diode, lamp, spectral combination, collection optics, filters, monitoring, and replacement strategy.

Homogenization

Fly-eye, light-pipe, integrator, condenser, relay, and pupil architecture selected for field and source.

Collimation and telecentricity

Angular distribution, chief-ray control, mask or substrate geometry, edge performance, and stray light.

Thermal and optomechanical design

Heat paths, expansion, alignment, contamination control, access, safety interfaces, and serviceability.

Mapping and qualification

Irradiance and uniformity mapping, spectral checks, stability, aging strategy, and acceptance documentation.

04Technical envelope

Exposure architectures scaled to the process.

Representative capability is shown with the context needed to qualify it. Program requirements control the final architecture and acceptance values.

Contact and proximity exposure

Parallel-light systems for wafer, substrate, PCB, and application-specific mask processes.

Large-area UV exposure

Homogenized fields for panel, coating, bonding, curing, and process-tool integration.

Maskless illumination

DMD-compatible source delivery, field homogenization, pupil shaping, and spectral control.

UV inspection and excitation

Application-tuned illumination for fluorescence, inspection, metrology, and imaging.

REFERENCE ENVELOPE

Common wavelengths365 / 385 / 405 nmSingle or selected multi-band configurations

Compact exposure4 / 6 / 8 inch classContact, proximity, or equipment-integrated architectures

Panel reference300 x 300 mmRepresentative 12-inch-class active area

Large-area reference400 x 500 mmRepresentative 405 nm configuration

Uniformity targets3 to 4% reference classMeasurement definition and configuration dependent

Irradiance reference5 to 35 mW/cm2Source, field, wavelength, and working-distance dependent

Reference values summarize available configuration classes. Final irradiance, uniformity, working distance, spectral band, thermal stability, and measurement protocol are established for the intended process.

05What you receive

Engineering outputs your team can review, build, test, and maintain.

The exact package follows the program stage and scope. Assumptions, interfaces, decisions, and acceptance evidence remain visible.

Illumination architecture

Source, collection, mixing, pupil, field, interfaces, and full radiometric budget.

Optical model

Sequential and non-sequential analyses, tolerance inputs, stray-light paths, and sensitivity results.

Thermal interface definition

Heat-load estimates, stability assumptions, monitoring points, cooling needs, and interlocks.

Mechanical package

Optical datums, mounts, access, alignment, enclosure, contamination, and service interfaces.

Uniformity map and method

Detector, fixture, sampling grid, warm-up state, correction method, and acceptance limits.

Release and support

Controlled specifications, drawings, BOM, build support, qualification, and production transfer.

06Controlled delivery

A local engineering interface from first review through release.

PAO leads the technical work, coordinates specialized fabrication and production resources under the project quality process, and keeps responsibility for requirements, interfaces, evidence, and issue closure clear.

01
Technical intake
Define the system boundary, decision to be made, current evidence, constraints, and confidentiality path.
02
Requirements and risk
Create measurable requirements, interface assumptions, performance budgets, and a ranked technical risk register.
03
Architecture and proof
Compare viable concepts and retire the highest-risk assumptions with analysis, breadboards, or targeted tests.
04
Detailed engineering
Develop controlled optical, mechanical, calibration, test, and supplier-ready documentation.
05
Build and verification
Support procurement, assembly, alignment, test correlation, root cause, and evidence-based iteration.
06
Release and transfer
Close acceptance criteria, configuration, supplier questions, manufacturing issues, and production handoff.

07Qualification questions

Questions engineering teams ask before engaging.

01How is UV uniformity specified?

The formula, detector, sampling grid, active-area exclusion, working distance, warm-up state, wavelength, and correction method must all be stated. PAO defines the measurement with the optical requirement.

02Can you replace a mercury-lamp system with LEDs?

Often, but spectral response, source etendue, angular distribution, irradiance, thermal management, process chemistry, and qualification must be reviewed before selecting an LED architecture.

03Can PAO support large custom exposure fields?

Yes. Large fields are handled through source-array, homogenizer, condenser, relay, thermal, and mapping trades. Practical limits depend on irradiance, uniformity, angle, working distance, package, and cost.

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