Spatial light modulator

A testing device disclosed by the present invention comprises a support frame, an optical module and a shading assembly, the optical module comprises an optical platform and a height-adjustable fixed seat assembly, and the optical platform is provided with a first linear guide rail, a second linear guide rail perpendicular to the first linear guide rail and at least two circular guide rails. The first linear guide rail and the second linear guide rail are each provided with a first scale line, the circular guide rail is provided with a first scale line or an angle line, the first linear guide rail and the second linear guide rail intersect with the circular guide rail, and the multiple fixing base assemblies are arranged on the first linear guide rail or the second linear guide rail or the circular guide rail in a sliding mode. The shading assembly comprises a plurality of shading pieces, the shading pieces and the optical platforms are arranged in a one-to-one correspondence mode, the shading pieces are arra