The invention belongs to the technical field of
optics, and particularly relates to a spatial phase shift dynamic interferometer based on a
liquid crystal spatial light modulator and application of the spatial phase shift dynamic interferometer. The spatial phase shift dynamic interferometer based on the
liquid crystal spatial light modulator comprises a He-Ne
laser, a first pinhole filtering, a first collimation and beam expanding
system, a
lambda / 2 wave plate, a polarizing beamsplitting
prism, a first
lambda / 4 wave plate, a second collimation and beam expanding
system, a second pinhole filtering, a polarizing film, the
liquid crystal spatial light modulator, a second
lambda / 4 wave plate, a standard spherical mirror, a measured mirror, a polarization analyzer, an imaging
system, a third pinhole filtering and an
optical detector,
dynamic testing of an aspheric surface member and a free-form surface member is realized through
coded modulation of SLM, the SLM is used for replacing a tinypolarization phase shift array to realize spatial
phase modulation, the adjustment is simple, the tiny polarization phase shift array is not required, and the difficulty is greatly reduced. Accordingto the spatial phase shift dynamic interferometer based on the
liquid crystal spatial light modulator and application of the spatial phase shift dynamic interferometer, the function of real-time
dynamic display is achieved, low
energy consumption, easy control and high speed are achieved, the spatial resolution ratio is easier to improve, and high-precision measurement is realized.