The SID4 eSWIR from PHASICS is an Extended SWIR Wavefront Sensor that operates at a wavelength of 0.9 μm - 2.35 μm. It has a phase spatial resolution of 120 μm and phase & intensity sampling of 80 x 64. This wavefront sensor has an aperture dimension of 9.6 mm x 7.68 mm and accuracy below 40 nm (RMS). It has a resolution (phase) of up to 6 nm (RMS) and real-time processing frequency of 10 Hz (full resolution). This wavefront sensor integrates PHASICS patented technology with a T2SL detector and provides both MTF & aberrations in one single shot. It can be controlled via a USB 2.0 interface and is available in a package that measures 90 mm x 115 mm x 120 mm. This wavefront sensor is ideal for free-space optical communication, defense & security, and aerospace applications.