Use of holography for surface measurement and characteriaztion

This research focuses on the use of digital holography for measuring the shape of optical and other surfaces. For the first experiments, we used a standard double-wave holographic interferometry method. This served as a reference. However, the main focus is Frequency Sweeping Digital Holography (FSDH), or scanning digital holography, which utilizes fluently translatable DFB laser diodes. The accuracy of this method can be further improved by combining measurements from multiple wavelengths - multiple diodes. When combined, this method can achieve accuracy of up to 2 μm