Optical Coherence Tomography (OCT) applications typically require open-frame 2-axis scan heads with 5mm, 7mm, or 10mm aperture protected silver coated mirrors.  The X-axis (line axis) performs a high-frequency raster scan, whereas the Y-axis (page axis) performs a lower speed scan to move the line scan down the field. Nutfield offers a signal generator/DAC that completes the scanning solution for microscopy customers.