| Citation: | SU Bo-hao, LIU Jian-li, WANG Wei, BAYANHESHIG. Design of a paraboloid-prism echelle spectrometer[J]. Chinese Optics, 2026, 19(2): 308-316. doi: 10.37188/CO.2025-0140
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Aiming at the technical challenge of reconciling high resolution with miniaturization 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 with different orders and a reverse off-axis parabolic focusing mirror is primarily used to eliminate the aberrations introduced by the prism, thereby enabling the miniaturization of the spatial layout. In this paper, we briefly describe the design methods for echelle gratings and dispersive prisms. Additionally, the aberration characteristics of the focusing optical path are analyzed using 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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