Automation of Optical Test Equipment using LabVIEW

A blue array of GaN-based μLEDs and a Golden Dragon Plus commercial LED (OSRAM) were analysed under a pulsed current. A LabVIEW program by National InstrumentsTM is used to automate the measurements of the envelope at the top of the pulse at different frequencies. The program allows to save, to plot and to elaborate the data measured. The results, characterised by noise at high frequencies, show an increase of the bandwidth with the voltage of the pulse applied. In the array of μLEDs the bandwidth increases using smaller pixels. However these pixels can carry a limited voltage. On the other side, the commercial LED carries high voltages but is limited in bandwidth due to its internal properties. Finally, pulse conditions improve the performance of the μLED. In respect to a pulse, a DC current sent to the μLED leads to lower bandwidths. The first part of the report presents the experiments and the results. A manual for the LabVIEW programs used is given in the second and last part.