Laser diode arrays and units – specially developed for shearography by isi-sys – are one of the system key products. The isi-LD688 series for pulse (see trigger-system) and –cw illumination is driven in mono-mode with 50mW. Wavelength selected array of 1-4, 6, 8 laser diode can be series connected to one driver unit. Visibility of the wavelength (688nm) is advantageous in adjustment and laser safety requirements (classification 2M or 3B).