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Yang S, Li Y, Zhang W X, et al. Optical system design of wedge beam splitter splitting mid-wave infrared Fizeau interferometer[J]. Opto-Electron Eng, 2023, 50(5): 230014. doi: 10.12086/oee.2023.230014
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Optical system design of wedge beam splitter splitting mid-wave infrared Fizeau interferometer
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Abstract
To solve the problem of beam splitting limitation of cemented cubic beam splitters in the mid-wave infrared band, the optical design scheme of mid-wave infrared Fizeau interferometers based on wedge splitting is proposed. At the working wavelength of 3.39 μm, to reduce the return error of the interference system and improve the measurement accuracy, a two-reflection folding collimating optical path structure is adopted, which not only ensures a good collimating wavefront, but also optimizes the design of the optical wedge to take into account the wavefront quality of the interference imaging. ZnSe and CaF2 materials are used, the collimator of the interferometer is a single plano-convex aspheric structure, and the imaging lens is composed of two separate spherical mirrors. Through the Montecarlo simulation tolerance analysis, the collimator wavefront PV of the collimator within 0.1° field of view is better than λ/4. The normalized field of view imaging wavefront PV of the interferometric optical path is better than λ/5; The interferometric system return error is smaller than λ/50 at 0° field of view placed on the standard surface and the surface under test is tilted within 0.05°. -
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References
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Overview
The mid-wave infrared interferometer is an important precision instrument for measuring the refractive index uniformity of infrared materials, wave aberration of infrared optical systems, and spherical surface shape. Its optical system design has certain difficulties. In the spectroscopy scheme, it is difficult to realize spectroscopy by using the glued cubic beam splitter, and it is easy to introduce aberration mainly by image dispersion in the interferometric spectroscopy system by using the flat beam splitter. To investigate the design difficulties of the optical system of the mid-wave infrared Fizeau interferometer and the limitations of the spectroscopic scheme, this paper proposes the design of the mid-wave infrared Fizeau interferometer based on optical wedge spectroscopy. The use of optical wedge spectroscopy can effectively correct the image scattering aberration introduced by flat beam splitter spectroscopy in the interferometric imaging wavefront, which can improve the quality of the interferometric imaging wavefront, reduce the return error of the interferometric system, and improve the accuracy of measurement. This paper focuses on the effect of the collimator, wedge tilt angle, wedge angle, and other parameters on the optimized wavefront of the interference optical system. According to the above analysis, the optical system design of the mid-wave infrared Fizeau interferometer was completed. The twice reflective folding collimated optical path is used to ensure a well collimated wavefront of the interferometer by controlling the angular aberration design of the single plano-convex aspherical collimator, and the imaging aberration and normalized field-of-view imaging wavefront of the interferometric optical path are strictly controlled to reduce the return error of the interferometric system and improve the interferometric accuracy. At the working wavelength of 3.39 μm, ZnSe, and CaF2 materials are used, the collimator of the interferometer is a single plano-convex aspheric structure, and the imaging mirror is composed of two separate spherical mirrors. Through the Montecarlo simulation tolerance analysis, the collimation wavefront PV of the collimator within 0.1° field of view is better than λ⁄4, and the normalized angular aberration of the exit aperture is better than 3.01×10−5 rad. The normalized field of view imaging wavefront PV of the interferometric optical path is better than λ/5, the MTF value is better than 0.38 at 25 lp/mm, and the maximum imaging distortion of the interferometric system is smaller than 0.1%. The interferometric system return error is smaller than λ/50 at 0° field of view placed on the standard surface and the surface under test is tilted within 0.05°. The mid-wave infrared Fizeau interferometer based on optical wedge spectroscopy provides a new idea for the design of optical systems for mid-wave infrared interferometers.
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Yang S, Li Y, Zhang W X, et al. Optical system design of wedge beam splitter splitting mid-wave infrared Fizeau interferometer[J]. Opto-Electron Eng, 2023, 50(5): 230014. doi: 10.12086/oee.2023.230014
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Figure 1.
Schematic design of the wedge splitting mediumwave infrared Fizeau interferometer
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Figure 2.
Return error of the interference system. (a) Return error diagram of the reflective collimating optical interference system; (b) Return error of the reflective and transmissive collimating optical path interference system
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Figure 3.
Schematic diagram of the optical path of the wedge beam splitter wavefront simulation
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Figure 4.
Optimal wedge beam splitter angle
${w_{{\rm{best}}}}$ -
Figure 5.
Wavefront PV curve of the plate beam splitter and wedge beam splitter interference system at different tilt angles of the beam splitter T
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Figure 6.
Wavefront PV curve of the wedge beam splitter interference system. (a) Relationship between wavefront PV of wedge beam splitter interferometric system and collimator F#; (b) Relationship between wavefront PV of wedge beam splitter interferometric system and tilt angle of wedge beam splitter T
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Figure 7.
Relationship curve between the optimal wedge beam splitter angle
${w_{{\rm{best}}}}$ -
Figure 8.
Illumination path of the wedge splitting medium wave infrared Fizeau interferometer
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Figure 9.
Design results of the collimator. (a) PV of collimated wavefront for the collimator at 0° field of view; (b) PV of collimated wavefront for the collimator at 0.1° field of view; (c) Angular aberration of the normalized exit aperture for the collimator at 0° field of view
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Figure 10.
Monte carlo simulation tolerance analysis of the collimator
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Figure 11.
Image quality evaluation of the interferometer imaging optical path. (a) Imaging wavefront PV of the normalized field; (b) MTF curve; (c) Distortion curve
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Figure 12.
Monte carlo simulation tolerance analysis of the interferometer imaging optical path
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Figure 13.
Stray light analysis diagram of the wedge beam splitter. (a) Schematic diagram of stray light introduced by reflection fromthe front and rear surfaces of the wedge beam splitter; (b) Light traces at the aperture diaphragm surface
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Figure 14.
Retrace error of wedge splitting medium wave infrared Fizeau interferometer
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