Transmitted wavefront error (TWE) is used to qualify the performance of optical elements as light passes through.
Unlike surface form measurements, transmitted wavefront measurements include errors from the front and back surface, wedge, and homogeneity of the material. This metric of overall performance offers a better understanding an optic’s real-world performance.
While many optical components are tested individually for surface form or TWE specifications, these components are inevitably built into more complex optical assemblies with performance requirements of their own. In some applications it is acceptable to rely on component measurements and tolerancing to predict final performance, but for more demanding applications it is important to measure the assembly as-built.
TWE measurements are used to confirm an optical system is built to specification and will function as expected. Additionally, TWE measurements can be used to actively align systems, decreasing assembly time, while ensuring the expected performance is achieved.
Real-Time Optical Alignment of Optical Systems
ZYGO’s patented DynaPhase® data acquisition technology (available on all current model ZYGO interferometers) enables real-time optical alignment and the measurement of temporal changes of an optical system, all with industry-leading precision.
Watch the accompanying video for a brief demonstration.
Using ZYGO interferometers, measuring Transmitted Wavefront Error is straightforward and reliable.