| Citation: | SU Bohao, LIU Jianli, WANG Wei, BAYANHESHIG. Design of a paraboloid-prism echelle spectrometer[J]. Chinese Optics. doi: 10.37188/CO.2025-0140
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Aiming at the technical challenge that high resolution and miniaturization are difficult to be reconciled in traditional echelle spectrometers, this paper presents a novel optical design for a compact echelle spectrometer.
First, based on the crossed Czerny-Turner structure, the design adopts a transmission prism as the cross-dispersing element to separate spectra of different orders and a reverse off-axis parabolic focusing mirror mainly for eliminating the aberrations introduced by the prism, thereby realizing the miniaturization of the spatial layout. In this paper, we briefly describe the design methods of echelle gratings and dispersive prisms. Additionally, the aberration characteristics of the focusing optical path is analyzed through the theory of optical path aberration.
The simulation results show that the parabolic-prism type echelle spectrometer has a spectral range of 450~650 nm, a numerical aperture of 0.05, and a resolution up to 0.06 nm. Moreover, under the condition of reasonable tolerance range, the system volume is only 80 mm × 44 mm × 18 mm.
It can satisfy the application requirements of portable and high-precision spectral detection.
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