Industrial & Manufacturing

Laser diodes are semiconductor components that have won over manufacturers for a number of reasons: a wide spectral range, compactness and ease of integration, excellent electro-optical efficiency and, above all, guaranteed performance over a very long service life of between 10,000 and 30,000 operating hours (and sometimes much more), which represents between one and three and a half years of use (24/7). As a result, laser diode manufacturers are seeking to characterize their production in order to guarantee good performance to their customers. This is why they have set up lifetime test benches, which involve highly accelerated aging, under controlled conditions, of a group of lasers taken as a representative sample. The optical degradation of laser diodes is observed and recorded by precisely measuring changes in the laser's operating characteristics during the test. Life tests are used to qualify laser diodes by the supplier during product development, and can be carried out throughout the lifetime of the laser. The data collected during these lifetime tests is used to predict the laser's lifetime under the expected operating conditions. Many device parameters can be controlled to provide lifetime test analysis, such as optical output power, threshold current and operating current. These are the main characteristics (with the wavelength of the emitted beam) of interest to laser diode users. This accelerated device aging is achieved by applying a high temperature to the device under test.

  In addition to diode lifetime characterization benches, the manufacturers of these components also carry out burn-in tests to guarantee post-production reliability. This test is carried out during the laser manufacturing process.This early detection process eliminates defective components from the production line, which may prove to be defective in terms of service life in post-production.

Eliminating short-life laser diodes means subjecting the devices to burn-in tests at high temperatures. This will improve the reliability of the remaining lasers. Burn-in tests can significantly increase test cycle times and manufacturing costs. That's why it's common for laser diodes to undergo burn-in tests lasting less than 100 hours. A laser diode is eliminated by burn-in testing if a change in one or more operating parameters is detected. These key operating parameters are measured before and after the high-temperature burn-in tests. During testing, it is important to keep the operating temperature and current as high as possible to minimize the time needed to complete the test. However, it is also important to avoid setting them too high so that the laser degrades in a way that would not be present under normal operating conditions.

Copyright   2024 DIMIONE Systems. All Right Reserved.