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The reliability of a laser module depends directly on the performance of its semiconductor diode. Over time, this laser diode undergoes a natural aging process that impacts output power and can reduce system stability. Understanding the factors behind this degradation is essential to laser module design to anticipate failures and extend laser lifetime.
What Causes Aging
Aging occurs due to subtle internal changes within the semiconductor material and its thermal and electrical connections.
The main contributors include:
- Crystal lattice dislocations, which affect electron flow and optical efficiency.
- Facet oxidation, which gradually reduces optical output and can trigger localized damage.
- Degradation of solder joints and thermal interfaces, which raises internal temperature and accelerates wear.
These effects accumulate slowly over time, making continuous monitoring of optical performance critical to maintaining reliability.
What the Data Shows
The chart below illustrates the typical behaviour of laser diodes operating at 60 °C.
Even with constant current and controlled conditions, a gradual decline in optical power occurs, a clear indicator of the aging process at work.
This data highlights how laser performance evolves with use and reinforces the importance of laser module design in managing these effects effectively.
Temperature: The Critical Factor
Temperature is one of the most significant factors influencing laser diode lifetime. For every 10 °C increase in operating temperature, the expected lifetime is reduced by half.
For example:
10,000 hours at 25 °C
5,000 hours at 35 °C
2,500 hours at 45 °C
1,250 hours at 55 °C
Effective thermal management: through optimized heat paths, heatsinking, or active cooling is essential to ensure long-term performance and system stability.
Want to learn how advanced laser module design can mitigate these effects and extend operational life?
Download the full whitepaper: Ensuring Laser Reliability in Critical Systems
ProPhotonix is a leading designer and manufacturer of Laser Diodes, Laser Modules, UV LED Curing Systems, LED Products, and UVC LED Disinfection Systems. Contact us for free expert advice on selecting the optimal solution for your system.
ProPhotonix laser module range includes laser modules by beam shape including crosshair lasers, line lasers and dot laser modules. Contact us for free expert advice on selecting the optimal solution for your system.
