On-line monitoring tools for laser-based technology assessment

The use of ultrafast lasers provides many new possibilities for microscale processing applications due to their ability for virtually thermal ablation and high peak power. One particularly useful application is a thin film laser scribing, which can be used for example in solar  panel manufacturing in order to improve the efficiency of solar cells. Processing speed in laser scribing applications can reach as high as several meters per second, in combination with high quality requirements. Defects in the scribing line, resulting from disturbances in the process, will greatly affect the quality of the end product. Presently, there is a demand for research in the fields of process monitoring and quality control. LUT having huge experience in monitoring laser macro-processing processes is testing sensitivity and lateral resolution of the techniques to be applied with ultra-short pulse lasers, possessing not so much high average power but working at high pulse repetition rate.e in

Real-time online monitoring of laser scribing of CIGS solar cells using photodiodes: The goal was to develop and evaluate a method for monitoring the laser scribing process in real time using photodiodes to detect defects in the process. Set of photodetectors were tested with 20 W nanosecond fiber laser working at repetition rate up to 1 MHz. Sensitivity all the techniques was tested and limitations of the techniques were evaluated.


Development of a real-time simulation platform based on industrial automation process of CIGS laser scribing: First real-time online simulator for CIGS manufacturing based on real-process has been developed. This automation system is developed based on the real-process in the industry. The necessity of developing such simulator was to have same process methodology for real-time monitoring. The simulator integrated with the real-time control system of the pulsed laser and the scanner head. Also, the developed monitoring systems which were developed in APPOLO project are integrated to the simulator. In this way, adaptive real-time control of the CIGS thin film scribing based on real industrial process came possible.