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Sun S, Zhao H, Guo Q, Wang Y. Spatial-Dependent Spectral Response of Acousto-Optic Tunable Filters with Inhomogeneous Acoustic Distribution. MATERIALS (BASEL, SWITZERLAND) 2024; 17:4537. [PMID: 39336278 PMCID: PMC11433482 DOI: 10.3390/ma17184537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2024] [Revised: 09/08/2024] [Accepted: 09/11/2024] [Indexed: 09/30/2024]
Abstract
The spectral response of an acousto-optic tunable filter (AOTF) is crucial for an AOTF based spectral imaging system. The acousto-optic (AO) interaction within the spatial-distributed area of the acoustic field determines the spectral response of the light incidence. Assuming an ideally uniform acoustic field distribution, phase-matching geometries can be applied to calculate the anisotropic Bragg diffraction in AO interactions, determining the wavelength and direction of the diffracted light. In this ideal scenario, the wavelength of the diffracted light depends solely on the direction of the incident light. However, due to the non-ideal nature of the acoustic field, the wavelength of the diffracted light exhibits slight variations with incident position. In this paper, an analytical model is proposed to calculate the spatial-dependent spectral response of the diffracted light under non-uniform acoustic field distribution. The study computes the variation pattern of the diffracted light amplitude caused by the inhomogeneous acoustic distribution. The theoretical considerations and computational model are confirmed by AOTF frequency scanning experiments. The study demonstrates that the distribution of the acoustic field leads to non-uniform spatial-spectral response in the AOTF, and the spatial AO interaction computational model can provide data support for calibrating AOTF systems in imaging applications.
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Affiliation(s)
- Shujing Sun
- School of Instrumentation and Opto-Electronic Engineering, Beihang University, Beijing 100191, China; (S.S.)
- Qingdao Research Institute of Beihang University, Qingdao 266104, China
| | - Huijie Zhao
- School of Instrumentation and Opto-Electronic Engineering, Beihang University, Beijing 100191, China; (S.S.)
- Qingdao Research Institute of Beihang University, Qingdao 266104, China
- Institute of Artificial Intelligence, Beihang University, Beijing 100191, China
- Aerospace Optical-Microwave Integrated Precision Intelligent Sensing Key Laboratory of Ministry of Industry and Information Technology, Beihang University, Beijing 100191, China
| | - Qi Guo
- School of Instrumentation and Opto-Electronic Engineering, Beihang University, Beijing 100191, China; (S.S.)
- Qingdao Research Institute of Beihang University, Qingdao 266104, China
- Aerospace Optical-Microwave Integrated Precision Intelligent Sensing Key Laboratory of Ministry of Industry and Information Technology, Beihang University, Beijing 100191, China
| | - Yijie Wang
- School of Instrumentation and Opto-Electronic Engineering, Beihang University, Beijing 100191, China; (S.S.)
- Qingdao Research Institute of Beihang University, Qingdao 266104, China
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Yushkov KB, Chizhikov AI, Obydennov DV, Molchanov VY. Phase-tuned acousto-optic spatial filter. OPTICS LETTERS 2024; 49:3866-3869. [PMID: 39008728 DOI: 10.1364/ol.525309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2024] [Accepted: 05/28/2024] [Indexed: 07/17/2024]
Abstract
An acousto-optic (AO) tunable filter with a phase-controlled dual-section piezoelectric transducer is designed and created for laser beam shaping (LBS). Owing to the acoustic beam steering effect, we experimentally observe splitting of the two-dimensional transfer function. As a result, we demonstrate generation of tunable bottle laser beams and dual-ring intensity distributions for the diffracted beam.
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Zhao H, Cheng C, Guo Q, Ma R, Yang Y. Analysis of Phase Mismatch for Mercurous Bromide-Based Non-Collinear AOTF Design in Spectral Imaging Applications. MATERIALS (BASEL, SWITZERLAND) 2024; 17:1703. [PMID: 38612215 PMCID: PMC11012605 DOI: 10.3390/ma17071703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2024] [Revised: 03/31/2024] [Accepted: 04/03/2024] [Indexed: 04/14/2024]
Abstract
The spectral and spatial characteristics of Acousto-Optic Tunable Filters (AOTFs), such as a tuning curve, spectral resolution, angular aperture, and diffraction efficiency, are determined by the device's acousto-optic crystal configuration and piezoelectric transducer. For high-throughput spectral imaging applications, it is essential to enlarge the spectral bandwidth and angular aperture during the design phase of AOTFs. Thus, phase mismatch due to incident angle or wavelength was studied analytically using phase diagrams in this paper. Additionally, a performance parameter analysis model was established based on the use of mercurous bromide crystals for large angular aperture AOTF device design, and the impact of crystal and transducer design parameters on the spectral bandwidth and angular aperture was evaluated. This also experimentally validates the diffraction capability of AOTFs made from mercurous bromide crystal, which possess a broad spectral transmission ability ranging from visible to long-wave infrared.
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Affiliation(s)
- Huijie Zhao
- School of Instrumentation and Opto-Electronic Engineering, Beihang University, Beijing 100191, China; (C.C.); (R.M.)
- Institute of Artificial Intelligence, Beihang University, Beijing 100191, China
- Aerospace Optical-Microwave Integrated Precision Intelligent Sensing, Key Laboratory of Ministry of Industry and Information Technology, Beihang University, Beijing 100191, China
- Qingdao Research Institute of Beihang University, Qingdao 266104, China
| | - Chi Cheng
- School of Instrumentation and Opto-Electronic Engineering, Beihang University, Beijing 100191, China; (C.C.); (R.M.)
- Qingdao Research Institute of Beihang University, Qingdao 266104, China
| | - Qi Guo
- School of Instrumentation and Opto-Electronic Engineering, Beihang University, Beijing 100191, China; (C.C.); (R.M.)
- Aerospace Optical-Microwave Integrated Precision Intelligent Sensing, Key Laboratory of Ministry of Industry and Information Technology, Beihang University, Beijing 100191, China
- Qingdao Research Institute of Beihang University, Qingdao 266104, China
| | - Rui Ma
- School of Instrumentation and Opto-Electronic Engineering, Beihang University, Beijing 100191, China; (C.C.); (R.M.)
- Qingdao Research Institute of Beihang University, Qingdao 266104, China
| | - Yutian Yang
- School of Instrumentation and Opto-Electronic Engineering, Beihang University, Beijing 100191, China; (C.C.); (R.M.)
- Qingdao Research Institute of Beihang University, Qingdao 266104, China
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Obydennov DV, Yushkov KB, Molchanov VY. Independent multicolored bottle-beam generation using acousto-optic spatial shaping of a femtosecond laser beam. OPTICS LETTERS 2023; 48:5320-5323. [PMID: 37831857 DOI: 10.1364/ol.498581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 09/15/2023] [Indexed: 10/15/2023]
Abstract
We report on the development of a tunable spectral and spatial frequency shaping system for ultrashort laser pulses using acousto-optic filters. The system enables the creation of arbitrary axially symmetric multi-wavelength field configurations in the Ti:sapphire laser emission range near 800 nm and controlling them at a multi-kilohertz rate. We experimentally demonstrate independent generation of two-colored annular intensity distributions from a single femtosecond laser beam and a bottle beam having the hollow cylindrical volume with the aspect ratio of 9:1. This laser beam shaping system can be useful in creating advanced setups for an optical control of cold atoms.
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Yu K, Guo Q, Zhao H, Cheng C. The Calibration Methods of Geometric Parameters of Crystal for Mid-Infrared Acousto-Optic Tunable Filter-Based Imaging Systems Design. MATERIALS (BASEL, SWITZERLAND) 2023; 16:2341. [PMID: 36984221 PMCID: PMC10059917 DOI: 10.3390/ma16062341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 02/28/2023] [Accepted: 03/07/2023] [Indexed: 06/18/2023]
Abstract
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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Affiliation(s)
- Kai Yu
- School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China
| | - Qi Guo
- School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China
- Key Laboratory of “Precision Opto-Mechatronics Technology”, Ministry of Education, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China
| | - Huijie Zhao
- School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China
- Key Laboratory of “Precision Opto-Mechatronics Technology”, Ministry of Education, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China
| | - Chi Cheng
- School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China
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Analysis on the Influence of Incident Light Angle on the Spatial Aberrations of Acousto-Optical Tunable Filter Imaging. MATERIALS 2022; 15:ma15134464. [PMID: 35806587 PMCID: PMC9267257 DOI: 10.3390/ma15134464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 06/20/2022] [Accepted: 06/22/2022] [Indexed: 11/23/2022]
Abstract
Acousto-optical tunable filter (AOTF) does not conform to the pinhole model due to the acousto-optic interaction. A calculation method of AOTF aberrations under the condition of incident light with a large arbitrary angle is proposed to solve the problem of coordinate mapping between object space and image space of the AOTF system without refractive index approximation. This approach can provide accurate pointing information of the interested targets for the tracking and searching system based on AOTF. In addition, the effect of cut angle values of the paratellurite crystal on aberrations was analyzed to optimize the design of AOTF cutting according to different application requirements. Finally, distribution characteristics and quantitative calculation results of AOTF aberrations were verified by experiments with different targets, respectively. The experimental results are in good agreement with the simulations.
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Yushkov KB, Slinkov GD, Gurov VV, Molchanov VY. Characterization and alignment of acousto-optic devices using digital tailored RF waveforms. APPLIED OPTICS 2022; 61:5144-5151. [PMID: 36256194 DOI: 10.1364/ao.459256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 05/20/2022] [Indexed: 06/16/2023]
Abstract
Acousto-optic (AO) devices are used in a variety of light control and processing applications in different environments, including laboratory conditions and the field environment, as well as on air- and space-borne platforms. Accurate alignment and calibration of AO deflectors and tunable filters is crucial for correct operation and to achieve specified performances of those devices. We describe a simple routine to test and align AO devices with a programmable RF waveform generator. Using specially tailored RF waveforms as test signals enables single-shot measurement of an AO device's diffraction efficiency as a function of the applied RF signal frequency and amplitude. MATLAB code is available to implement the testing procedure and application demonstrations for an AO deflector and two types of AO tunable filters.
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Gorevoy A, Machikhin A, Martynov G, Pozhar V. Computational technique for field-of-view expansion in AOTF-based imagers. OPTICS LETTERS 2022; 47:585-588. [PMID: 35103682 DOI: 10.1364/ol.438374] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Accepted: 12/02/2021] [Indexed: 06/14/2023]
Abstract
A rather narrow field of view (FOV) has always been considered as an essential limitation of spectral imagers based on acousto-optical tunable filters (AOTFs). We demonstrate a computational technique to overcome this constraint. It is based on preliminary precise spectral-angular characterization of beam transformation caused by light diffraction on an acoustic wave and consequent correction of acquired stack of spectral images. This technique is applicable for any geometry of acousto-optic interaction and opens the way for the development of AOTFs with significantly expanded FOV.
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Obydennov DV, Yushkov KB, Molchanov VY. Ring-shaped optical trap based on an acousto-optic tunable spatial filter. OPTICS LETTERS 2021; 46:4494-4497. [PMID: 34525030 DOI: 10.1364/ol.435485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 08/13/2021] [Indexed: 06/13/2023]
Abstract
We report on a novel, to the best of our knowledge, optical scheme of an annular optical trap based on an acousto-optic tunable spatial filter. Design of the optical trap is proposed and validated. Experimental demonstration with polystyrene microspheres includes controllable arrangement of freely floating particles into a circular pattern, aggregation, and disaggregation of the particles. Dynamical adjustment of the trapping field potential diameter is achieved by programmable frequency-swept controlling of the acousto-optic filter.
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Yushkov KB. Noncritical acousto-optic Bragg phase matching: analysis of orthorhombic and monoclinic crystal systems. APPLIED OPTICS 2021; 60:7113-7121. [PMID: 34612996 DOI: 10.1364/ao.427199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 07/04/2021] [Indexed: 06/13/2023]
Abstract
Anisotropic acousto-optic diffraction in crystals is the fundamental phenomenon that is used to design acousto-optic tunable filters. Noncritical and quasicollinear phase-matching geometries of Bragg acousto-optic diffraction are compared for acoustic symmetry planes in four crystal systems (tetragonal, trigonal, orthorhombic, and monoclinic). The results for uniaxial crystals are reviewed and generalized for biaxial crystals. It is shown that cubic frequency dependence on the Bragg angle exists in two symmetry planes of orthorhombic crystals and conditionally exists in the symmetry plane of monoclinic crystals. It is also shown that there are two points in the symmetry plane of monoclinic crystals where noncritical phase matching takes place in quasicollinear diffraction geometry that can be used to design high-resolution tunable filters. Phase-matching configurations in α-iodic acid and potassium gadolinium tungstate crystals are analyzed.
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Yushkov KB, Champagne J, Kastelik JC, Makarov OY, Molchanov VY. AOTF-based hyperspectral imaging phase microscopy. BIOMEDICAL OPTICS EXPRESS 2020; 11:7053-7061. [PMID: 33408979 PMCID: PMC7747922 DOI: 10.1364/boe.406155] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 10/28/2020] [Accepted: 11/03/2020] [Indexed: 06/12/2023]
Abstract
Phase imaging microscopy with incoherent object illumination is convenient and affordable for biomedical research and clinics since it provides easy integration with a variety of bright-field optical microscopes. We report the design of a new hyperspectral imaging system based on a combination of a spatial light modulator (SLM) and an acousto-optic tunable filter (AOTF) for phase imaging microscopy. Contrast of phase-only objects originates from matched spectral and spatial filtering performed by the SLM and the AOTF located in Fourier-conjugate optical planes in the back-end of the optical system. The system is designed as an add-on to a standard optical microscope with incoherent diascopic sample illumination.
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Affiliation(s)
- Konstantin B. Yushkov
- National University of Science and Technology “MISIS”, 4 Leninsky prospekt, Moscow, 119049, Russia
| | - Justine Champagne
- IEMN UMR 8520, Université Polytechnique des Hauts-de-France, Campus Mont Houy, Valenciennes, 59313, France
| | - Jean-Claude Kastelik
- IEMN UMR 8520, Université Polytechnique des Hauts-de-France, Campus Mont Houy, Valenciennes, 59313, France
| | - Oleg Yu. Makarov
- National University of Science and Technology “MISIS”, 4 Leninsky prospekt, Moscow, 119049, Russia
| | - Vladimir Ya. Molchanov
- National University of Science and Technology “MISIS”, 4 Leninsky prospekt, Moscow, 119049, Russia
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