On inherent spatio-spectral image distortion in AOTF-based imagers

Martynov, Grigoriy N.; Gorevoy, Alexey V.; Мачихин, А. С.; Пожар, В. Э.

doi:10.1117/12.2592557

Cited by 5 publications

(6 citation statements)

References 21 publications

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“…However, this color difference can be almost completely compensated by adjusting the tilt of the output side of the acousto-optic unit to the input side. While, in the collimating scheme, the main aberration is the transverse chromatic aberration, which can be eliminated by choosing a different tilt angle [36,37].…”

Section: Confocal Schemementioning

confidence: 99%

Review of acousto-optic spectral systems and applications

2022

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Acousto-optic devices represented by acousto-optic tunable filters (AOTFs), have the advantages of wide wavelength range from the ultraviolet to the long-wave infrared and fast wavelength switching speed. Nowadays, acousto-optic spectral systems have become very important scientific instruments in laboratory. There are many factors to be considered when we choose different solutions for acousto-optic spectral systems, but there is no comprehensive analysis and summary of them. This paper explains the working principle of the acousto-optic devices and summarizes the most common optical schemes for acousto-optic spectral systems. We also analyzed their characteristics of application conditions. In addition, specific applications of acousto-optic spectral systems in some common fields are presented.

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Section: Confocal Schemementioning

confidence: 99%

Review of acousto-optic spectral systems and applications

2022

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“…The main equation for AO diffraction may be derived from the Bragg condition k d = k i ± q, where q, k i and k d are the wavevectors of sound, incident and diffracted light, respectively. The widely used AOTFs for visible and near-infrared light utilize the non-collinear anisotropic AO interaction in paratellurite (TeO 2 ) crystal because of its high diffraction efficiency and the ability to separate filtered and unfiltered beams by polarization [34][35][36][37][38][39][40][46][47][48][49]. In this case, the phasematching condition may be illustrated by the wavevector diagram (figure 4(a)), where the wavenumbers of incident and diffracted light beams are k o (λ) = 2πn o (λ) /λ and k e (λ) = 2πn e (λ) /λ, n o and n e are the refractive indices for ordinary and extraordinary polarized waves.…”

Section: Spectral Transmission Function Of Aotfmentioning

confidence: 99%

“…Thus, we can estimate spectral bandwidth ∆λ (defined as the FWHM of T (λ) for given f aotf and δθ aotf ) as a function of δθ aotf (see figure 4(b)). In contrast to f aotf , the spectral bandwidth ∆λ is nearly insensitive to the angular deviations of input beam in the plane perpendicular to the polar plane x aotf z aotf [40]. Finally, we used equation (12) to calculate the coherence length l c for several wavelengths.…”

Section: Spectral Transmission Function Of Aotfmentioning

confidence: 99%

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Multi-wavelength off-axis digital holographic microscopy with broadly tunable low-coherent sources: theory, performance and limitations

Gorevoy¹,

Polschikova²,

Мачихин³

et al. 2022

J. Opt.

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Multi-wavelength digital holographic microscopy (MDHM) is widely used in biological and industrial applications because of increased unambiguous height measurement range and the ability to measure concentration from the spectral dependence of phase delay. Acousto-optic tunable filters (AOTFs) provide the simultaneous selection of several bands with tunable central wavelengths to create a multiplexed hologram, but may limit the field of view (FOV) in off-axis holography because of the short coherence length of the filtered light. We analyzed the performance of the AOTF-based off-axis MDHM setup with a diffraction grating or a prism in the reference arm necessary to increase the efficiency of angular multiplexing. This allows varying the number of spectral channels selected simultaneously without setup realignment. Mathematical description relates the spectral bandwidth of the AOTF, tilt of the coherence plane induced by the angular dispersion of a prism or a grating, width of the FOV determined by interference pattern visibility, spatial resolution, and optimal intermediate wavelengths. We theoretically and experimentally demonstrated that the FOV may be expanded by changing the angle of light incidence on the AOTF and that the prism changes the wavelength dependence of the FOV. We validated this technique by single-shot acquisition of the height maps of the transparent test chart at four wavelengths with an error similar to that of four sequentially captured single-wavelength holograms. The results may be helpful for multiple applications of MDHM using spectrally tunable light sources.

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“…For geometric calibration, scholars are mostly committed to the research of system-level calibration methods. For instance, Pozhar, Machikhin [ 23 , 24 , 25 ], and Liu Hong [ 26 ] focused on the quantitative description of the AOTF spatial aberrations. As mentioned earlier, the aberrations of the system are caused by the coupling of many factors.…”

Section: Introductionmentioning

confidence: 99%

The Calibration Methods of Geometric Parameters of Crystal for Mid-Infrared Acousto-Optic Tunable Filter-Based Imaging Systems Design

Guo

Zhao

et al. 2023

Materials

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AOTF calibration is a complex topic that has various aspects. As far as geometric calibration is concerned, it includes not only processing errors and fixing errors in the optical system, but also the error of geometric parameters of crystal (GPC). GPC is the preset input in the optical design and optimization of Zemax, which determines the key parameters, including the spatial resolution, the field of view, and aberration. In particular, the compensation of aberration during the optical design requires accurate values of GPC. However, it is currently considered ideal. Therefore, two calibration methods based on the principle of parallel tangent are proposed: (1) the minimum-central wavelength method; (2) the minimum-frequency method. The deviation of the parallel tangent incident angle calibrated by the two methods is 0.03°. As a result, the tuning curve calculated in theory with the calibrated geometric parameters of AOTF is consistent with the tuning curve measured in practice.

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On inherent spatio-spectral image distortion in AOTF-based imagers

Cited by 5 publications

References 21 publications

Review of acousto-optic spectral systems and applications

Review of acousto-optic spectral systems and applications

Multi-wavelength off-axis digital holographic microscopy with broadly tunable low-coherent sources: theory, performance and limitations

The Calibration Methods of Geometric Parameters of Crystal for Mid-Infrared Acousto-Optic Tunable Filter-Based Imaging Systems Design

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