# Super-Resolution Multicomponent Joint-Interferometric Fabry-Perot-Based Technique
However, this approach increases the size and complexity of the interferometric optical path and introduces errors (i.e., traverse and wobble) during the motion of the corner mirror. Moreover, as the number of optical path folds increases, higher requirements are imposed for the collimation of the beam [13; 14; 15]. All of these factors affect the interference intensity. Meanwhile, only a small number of methods have been applied to spectral imaging. Under the existing conditions of selectable interferometric components, improving the maximal OPD, and even the spectral resolution of interferometric imaging spectrometers, has remained a difficult problem to solve. Fabry-Perot interferometers (FPIs) are based on the principle of multi-beam interference, with the advantages of a small size, high transmittance, strong spectroscopic ability, and good structural stability. These have made FPIs suitable for small and high-precision hyperspectral imaging detection fields [16; 17; 18; 19; 20]. Despite being a primary spectroscopic component in spectral imagers, several previous studies have demonstrated the combination of a FPI with other imaging spectrometers to improve their spectral resolution, including interferometric imaging spectrometers [21; 22; 23; 24; 25]. The principle of such a combination is to use an interval-tunable FPI to produce very sharp comb-like transmission spectra, while sampling each transmission peak more finely at a different location in the spectral sampling interval of the original spectral imager [21; 23]. The improvement in spectral resolution achieved via this resampling method depends mainly on the width of the FPI transmission peaks. Although this method holds great potential for spectral resolution improvement, it still engenders a number of challenging problems. The method requires a FPI with a narrow spectral transmission peak width and frequent interval changes, which is demanded for its high reflectance, optical accuracy, and interval-tuning accuracy. Nevertheless, it is worth noting that certain limitations apply to these indicators. In addition, the method adjusts the wavelength of the transmission peak center by tuning the FPI interval. Thus, the wavelength interval of adjacent transmission peaks will be changed for every resampling, which is concurrently related to the field of view. This will cause more difficulties during the early stage of spectrum calibration and in later stages for the reconstruction of the spectrum. The interferometric imaging spectrometer is characterized by a high spectral resolution, wide spectral range, and indirect acquisition of spectra. Therefore, the use of this resampling method makes the above-mentioned problems more prominent. A comparative analysis of the aforementioned two interferometer types shows that the transmission spectra of the two-beam and multi-beam interferences are periodic functions of the wave number. It follows that the combination of the two types of interference components can achieve a joint, cooperative interference in the working mechanism, herein referred to as \"multicomponent joint-interference\" (MJI). It uses multi-beam interference to increase the possibility of a frequency shift for double-beam interference transmission spectral information, thereby providing a new solution for improving the spectral resolution. In this study, we propose a new multicomponent joint-interference hyperspectral imaging (MJI-HI) technique to obtain a higher spectral resolution, based on a FPI. The role of the FPI is to modulate the spectrum with spectral mixing by multi-beam interference. The resulting interferogram contains modulated frequency spectral information. Owing to the modulation effect of the FPI, high-frequency interferometric information outside the maximal OPD is encoded into low-frequency interferometric information, which can be obtained by the inversion algorithm. This method of enhancing the spectral resolution can be equated to increasing the maximum OPD of an interferometric imaging spectrometer.