Laser Diode Burn-In Log Worksheet
Burn-in screens early failures by running devices under stress before shipment. This worksheet records hours and power, then calculates drift per device so out of limit units are easy to find.
| Serial number | Burn-in station | Case temp (C) | Hours on test | Initial power (W) | Current power (W) | Max allowed drop (%) | Power drop (%) | Drop per 100 h (%) | Within limit (1=yes) | |
|---|---|---|---|---|---|---|---|---|---|---|
0.4% | 0.83 | 1 | ||||||||
1.6% | 3.3467 | 1 | ||||||||
5.3% | 11.1386 | 0 | ||||||||
1.2% | 1.2255 | 1 | ||||||||
1% | 1.0522 | 1 |
Burn-in conditions, duration and acceptance limits come from your product reliability plan. This sheet records and calculates only; it does not predict lifetime.
Link burn-in data to lots
Optional review of how reliability test results could be linked to lots and serials in your ERP.
Optional. The tool and every export work without this. No spam.
How to use the worksheet
Log each device with its station, case temperature, hours on test, initial power and current power, along with the allowed drop from your reliability plan. The sheet calculates percent power drop and drop per 100 hours, then marks units within limit. Re-enter the current power at each checkpoint, or add a new row per checkpoint to retain history.
- Record temperature and drive conditions
- Use the same meter for initial and later readings
- Log checkpoints as separate rows
- Quarantine units outside the limit
The calculation
Power drop percent equals initial power minus current power, divided by initial power, times 100. For LD-1003 above, 5.05 W falling to 4.78 W is about 5.3 percent, beyond a 3 percent limit. The drop per 100 hours column normalizes drift across different durations for quick comparison.
Interpreting drift
Early rapid drift can indicate a defect that burn-in is designed to catch. Slow, stable drift is typical. Look at trends by station and temperature as well, since a failing station or fixture can mimic bad devices. Feed repeated failures into your corrective action process and consider linking lots to results in your ERP.
Frequently Asked Questions
How long should burn-in run?
It depends on the device, application and reliability plan. Durations from tens to hundreds of hours are common. Use your qualification data rather than a general figure.
Does this predict lifetime?
No. It records and screens. Lifetime prediction requires dedicated reliability testing and statistical models such as accelerated life tests.
Why track the station?
A faulty station, fixture or cooling problem can cause apparent drift across many devices. Station data helps separate device issues from equipment issues.
Can I add more checkpoints?
Yes. Add a new row for each checkpoint with the same serial number and updated hours and power. Export to Excel for plotting.
If burn-in results sit in lab files, Netray can help tie them to lots and serial numbers in your ERP for traceability.
Related Tools
Laser Module Final Test Data Worksheet
Editable test log by serial number with output power, limits, efficiency and automatic pass or fail, exportable to Excel.
Quality & InspectionOptics and Laser Equipment Calibration Log Worksheet
Editable log of laser power meters, spectrometers, interferometers and gauges with intervals, results and overdue flags, exportable to Excel.
Quality & InspectionPhotonics Nonconformance Report (NCR) Template
NCR form tuned to optics and laser production: defect type, optical measurements, containment, disposition and corrective action.
More Quality & Inspection tools
See all- Optical Component Incoming Inspection Report Template
- Cleanroom Particle Count Log Worksheet
- SAP QM Process Capability Cp Cpk Calculator
- SAP QM Lot Rejection Rate, PPM and Sigma Level Calculator
- SAP QM Gauge R&R Study Calculator
- SAP QM Cp and Cpk Capability Calculator
- Job Shop Material Certification Log Worksheet
- Job Shop First Piece Inspection Sign-Off Template
- Job Shop Scrap and Rework Cost Calculator