Characterization of Light Emitting Devices

The classic application focus of Optical Coherence Tomography (OCT) is the medical field of ophthalmology. However, today, OCT also gets considered for applications in industrial environments such as printed circuit board (PCB) layer diagnostics, and material surface analysis. Modern OCT solutions demand light sources with a high spectral bandwidth and a long coherence length. Super luminescent emitting diodes (SLED) and swept laser sources (SLS) are both light sources that need to fulfill increasingly demanding customer requirements. For this reason, SLED and SLS are becoming more expensive, meaning that a quality check is economically unavoidable before completing the next step: Packaging the SLED and SLS in butterfly packaging.

Fast and synchronized testing on-the-fly can be realized with PI’s Fast Multi-Channel Photonics Alignment (FMPA) systems. Automated area scans allow fast and reliable high-resolution emission profile analysis. Additionally, the intelligent gradient search algorithm can track the position of the optimum of any figure of merit e.g. light intensity for hours. These two algorithms are the core of the FMPA solution that run on many PI controllers. The variety of positioning systems on all length scales allows PI to find the perfect solution for light source quality control.