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We present a new approach for quality control in laser material processing. By means of an active optical element (SCPEM Single Crystal PhotoElastic Modulator) the emitted thermal radiation from the interaction zone of the focused laser radiation with the material surface is to be detected in order to determine a correlation to the process parameters from the polarisation state of the radiation. Due to the dependence of polarised radiation on the emission angle, the inclination of the interaction zone in the observed area can be deduced. For this purpose, an optomechanical setup for measuring two orthogonal polarisation directions of the emitted thermal radiation has been developed and a data acquisition system has been implemented. The amplitudes of two orthogonal polarisation directions could be determined from the signal modulated by the SCPEM during tests on different experimental setups. From the ratio of these polarisation components, emission angles can be derived using the Fresnel equations.

Polarisation Measurement of the Emitted Thermal Radiation During Laser Material Processing