Application notes and articles
One design question, answered with a worked example and figures drawn from code. Also technical articles for your site and white papers.
Application notes and articlesTechnical documents and tools for photonics
I turn your product data into documents, browser tools and reports, and prepare CAD files from your released drawings.
Give engineers the test conditions, selection criteria and worked examples they need to evaluate your parts.
EUV filter and multilayer mirror design
I design and model the thin films that 13.5 nm light passes through or reflects from: free-standing filters on their support mesh, and Mo/Si multilayer mirrors with the period and capping layer set for your angle and bandwidth. I also model spectral purity, meaning how much of the source’s deep-UV and infrared light gets past the filters to the mask and wafer.
EUV Insight is the browser app I built for EUV thin films and multilayers. On your project I use it to compare materials and thicknesses, run thickness tolerances and export spectra for your reports and datasheets. I take on DUV work too: coatings and filters for 193 nm and 248 nm.
- R peak
- 73.80%
- Peak wavelength
- 13.49nm
- Bandwidth (FWHM)
- 0.622nm
- Total thickness
- 278.5nm
Values from the results panel in the screenshot, for a Ru cap on 40 Mo/Si bilayers with a 6.9 nm period on a Si substrate.
Photodiodes and readout electronics
I design photodiode front ends from the device model to the finished board. I choose the TIA configuration, bias and filtering, work out the noise and bandwidth, and simulate the circuit in SPICE and MATLAB with your photodiode as a device model to show it meets the requirements.
Then I draw the schematic and lay out the PCB in KiCad, build the 3D model and write the datasheet from the same model and test data. You can hire me for one step or for the whole chain.
- Photodiode device model
- TIA and readout circuit
- MATLAB and SPICE simulation
- Verification against requirements
- KiCad schematic and PCB layout
- 3D model
- Datasheet and app note
Services available
Choose the document, tool or file your product needs.
Datasheets and product pages
Datasheets with the test conditions stated, product pages with a technical FAQ, and selection guides that go past the part-number table.
Datasheets and product pages3D models, drawings and CAD libraries
STEP models, outline drawings and KiCad libraries built from your released drawings.
3D models and drawingsSales enablement
Capability cards, a technical FAQ and decks your reps can send without waiting on engineering.
Sales enablementTechnical data and reporting
Reports and charts from your test data, with reusable Excel or Python templates for the next dataset.
Data reports and templatesDesign calculators
A browser calculator that answers your buyer’s question with their own numbers, branded for your site and tested against hand calculations.
Design calculatorsFrom 13.5 nm EUV to 5 µm in the mid-infrared
I write the application notes, selection guides and datasheets, and do the CAD and circuit design, for parts that work anywhere in this range.
EUV and DUV
For makers of multilayer mirrors, excimer optics and lithography subsystems: application notes on reflectance and layer tolerances, and datasheets for DUV coatings and CaF₂ optics. EUV Insight is the thin-film tool I built for this band.
UV and visible
For laser, filter and microscope optics makers: selection guides that match filter sets to laser lines, datasheets that state their test conditions, and an AOI shift calculator for your filters.
NIR and SWIR
For diode laser, fiber and LiDAR optics makers: application notes on TEC control and wavelength drift, like my TEC heat-load sample, product pages for telecom and LiDAR filters, and photodiode front-end circuit design.
MWIR
For IR material, lens and QCL makers: transmission and coating datasheets, and lens selection guides for germanium and chalcogenide glass.
Sample projects
Each sample includes public references and the calculations behind its figures and tables.
TEC control for laser wavelength stability
Application note, 8 pages, with a TEC heat load calculator.
Coming soon
Optical filter selection guide
Selection guide and white-paper example, 10 pages, with optical density and angle shift calculators.
Coming soon
Datasheet, before and after
A thin datasheet for a filter family, rewritten with its test conditions, typical values kept apart from limits, and curves drawn from code.
Coming soon
I also built EUV Insight, a browser app for optics engineers designing EUV thin films and multilayer optics.
euvinsight.com
Jezdan Gomez
I write the documents, build the calculators and prepare CAD files from your released drawings.
How I workVentura County, California
Industries served
Photonics and optics component makers, typically 20 to 400 people, that need application notes, product documentation or tools for selecting parts.
The same work suits makers of precision components in test and measurement, scientific instruments, motion and industrial automation.
- Filters and coatings
- Precision, molded and IR optics
- Polarization optics
- Laser modules, laser drivers and TEC controllers
- Fiber components
- Electro-optic and acousto-optic devices
- Photonic integrated circuits
- The optics of spectroscopy, imaging and metrology instruments
- Laser and broadband light sources
- Optomechanics and motion
Project packages
Start with one small project or a full kit. Every price is agreed before work starts.
Smaller projects
A capability card, a datasheet refresh, a technical article or a product-page rewrite.
App Note Sprint
One application note with a worked example and supporting calculations.
Product Launch Package
Datasheet refresh, product page, technical article, three posts and the launch email, timed to your launch.
Design-In Kit
Application note, selection guide, a design calculator, a sales one-pager and a technical FAQ.
Request a quoteRecommended
Monthly retainers are available for ongoing documentation and calculator work.
Also: product photography. I photograph optical and electronic parts for datasheets, product pages and trade-show graphics. Product photography
Trade show, print and marketing design
I write and check the technical content for your booth, banners, brochures, catalogs and booklets, and Pento Agency (opens in a new tab), who designed and built this site, does the design. You work with me from the brief to the print-ready files.
Start with a free review of your technical content
Get a one-page comparison of your technical content with two competitors, three recommended documents or tools, and a price for the first project.