High-flux Sagnac interference imaging spectrum apparatus

The invention discloses a high-flux Sagnac interference imaging spectrum apparatus, which comprises a front imaging object lens, a collimating object lens, a Sagnac interferometer, a half-wave plate, a combination polarization analyzer, a rear imaging object lens and a detector. The front imaging object lens, the collimating object lens and the Sagnac interferometer are sequentially arranged along the same optical axis, and the optical axis of the above optical elements is a first optical axis. The half-wave plate, the combination polarization analyzer, the rear imaging object lens and the detector are arranged in sequence along the same optical axis, and the optical axis of the optical elements is a second optical axis. The first optical axis is perpendicular to the second optical axis. Light beams split by the Sagnac interferometer enter the half-wave plate. All the optical elements have the same height coaxially relative to an apparatus pedestal. Compared with conventional same-optical-path interference imaging spectrum systems, the high-flux Sagnac interference imaging spectrum apparatus has the advantage that luminous flux is increased from less than 50% to more than 80%. Moreover, lamination of interference information helps to increase the signal to noise ratio of a system, and the spectrum recovery precision can be improved.