Selecting a Contract Manufacturer for Industrial Photonics: An Engineer's Checklist
Evaluating a CM for a photonics program is a different exercise than a general electromechanical program. Use this practical checklist to identify the right partner for your opto-mechanical assembly and optical system manufacturing.
Define Your Requirements First
Before contacting any CM, write down your requirements with specificity. Include:
- •Wavelength(s) and laser safety classification
- •Critical alignment tolerances and angular requirements
- •Environmental requirements and thermal stability
- •Optical cleanliness requirements (ISO Class)
- •Production volume and timeline
With these in hand, your CM conversations become substantive evaluations rather than generic quotes.
Section 1: Technical Capability
Tolerance and Metrology Capability
Ask for specific numbers on positional and angular tolerance capability. Look for sub-10 µm positional precision and arc-second angular accuracy. Ask what metrology equipment they have on the production floor, not just in a separate inspection area.
Red flag: All metrology is post-build with no in-process measurement or alignment verification.
Optical Alignment Infrastructure
Ask for a walk-through of their alignment process including fixture design, measurement methodology, and locking approach. Look for detailed knowledge of adhesives and bonding approaches for maintaining optical alignment.
Red flag: Vague descriptions of how alignment is achieved or maintained over time.
Cleanroom and Contamination Control
Ask about cleanroom classification, laminar flow protocols, and component handling procedures. Request documentation of their contamination control process and verification methods.
Red flag: No cleanroom environment or undocumented contamination protocols.
Section 2: Laser Safety Infrastructure
Safety Officer and Training
Ask if they have a designated Laser Safety Officer (LSO) and current IEC 60825-1 certification. How do they handle Class 3B and Class 4 laser systems during assembly and testing?
Laser Work Infrastructure
Look for defined laser work areas, beam containment protocols, and active monitoring systems. Ask how they verify beam alignment and power output.
Documentation and Compliance
Do they maintain laser hazard analysis documentation? Can they provide laser safety verification certificates for completed units?
Section 3: Program Management and Continuity
Team Stability and Expertise
Who will be your primary technical contact? Are they engineers or technicians? What is their background in photonics or optical systems? Will the same team work on repeat builds?
Documentation and Traceability
Ask for examples of their documentation - build travelers, inspection reports, first-article inspection packets. Can they trace components from receipt through final assembly?
Engineering Change Control
How do they manage design changes and ECNs? What is their process for documenting impact and obtaining approval? Can they manage mid-program modifications?
Section 4: Fit and Intent
Evaluate volume fit by asking what percentage of their work is in your volume range (10-150 units/year). Request references from comparable programs. Most importantly, pay close attention to conversation quality - a good CM asks detailed technical questions before providing a quote. They should understand the challenge before offering a price.
Questions to Ask
- •What percentage of your work is in the 10-150 units/year volume bracket?
- •Can you provide 2-3 references from similar photonics programs?
- •What is your most challenging recent program and what did you learn?
- •How would you approach this specific tolerance requirement?