The ScanDelay USB from APE Angewandte Physik & Elektronik are Precision Optical Delay Lines that has maximum scan ranges of 15 ps, 50 ps, or 150 ps. They have a linearity of 0.5% and clear aperture of 1" or 1/2". These optical delay lines have an internal generator with a frequency of 0.1 Hz - 20 Hz and external trigger input of 20 Hz - 50 kHz. They feature fast wide scans and smallest delays without any stick-slip effects. These optical delay lines have control electronics that contain a motor driver and quartz-stabilized signal synthesizer. They can be controlled via a USB interface or can be externally triggered with a frequency of 0.01 Hz - 20 Hz. These optical delay lines have an Au protective coating and are available in a package that measures 140 mm x 100 mm x 85 mm or 220 mm x 263 mm x 144 mm.