Image aberrations caused by acousto-optic (AO) anisotropic diffraction in uniaxial crystals are discussed. For their analysis, we propose a simplified ray-tracing model of an AO crystal cell (AOC). With this approach, one can assign any configuration interaction, material and geometry the crystal, then estimate all conventional ray aberrations, such as spherical, coma, astigmatism, distortion, etc. The optimization procedure is demonstrated aberration analysis three principal spectral...

Subject of study. This study investigated a method for designing an optoelectronic system providing simultaneous capture single broadband and 15 narrowband spectral images. Aim aimed to develop test multispectral video camera based on lens optical that forms images radiation detector array in the ultraviolet, visible, near-infrared ranges spectrum has sufficiently wide field view aperture. Method. The proposed solution is two configurations systems correspond front aperture stop inverse...

Subject of study. This study investigated the spatial-spectral distortions arising from acousto-optic diffraction, which must be considered when constructing an optical system and calibrating acousto-optical device. Aim aimed to perform spatial spectral calibration imaging spectrometers based on tunable filters develop a technique for equalizing transmittance filter in entire working range. Method. To obtain undistorted data, both inhomogeneities need corrected. The procedure consisted...

We propose a new technique for three-dimensional (3-D) imaging in arbitrary spectral intervals. It is based on simultaneous diffraction of two divergent stereoscopic light beams single acoustic wave propagating uniaxial birefringent crystal. discuss detail this configuration acousto-optic (AO) interaction, derive basic relations, and experimentally demonstrate the applicability proposed approach to 3-D imaging. A stereo-imager type may be produced as an ultra-compact embeddable optical...

The problem of in vivo photoluminescence diagnostics the tissues accessible by endoscopes is discussed. spectral imaging module attachable to conventional rigid and flexible medical developed described. It based on a double acousto-optical tunable filter (AOTF) specialized optical coupling system. provides wide field view (FOV), absence image distortions, random access, fast acquisition at any wavelength visible range accurate measurement reflectance spectrum each pixel image. Images typical...

We demonstrate that combining the laser heating (LH) system in a diamond anvil cell (DAC) with tandem acousto-optical tunable filter (TAOTF) allows measurement of temperature distribution (TD) under infrared (IR, 1064 nm) LH specimen high pressure DAC. The main component is TAOTF synchronized video camera. TD mapping within range approximately 1000–2000 K on surface laser-heated object (Fe plates) at DAC spatial resolution 2 µm by fitting actual signal to Planck's equation each point.

We report on the new technical realization of single-shot color digital holographic microscopy. For this application, we propose to use an original three-wavelength red, green, and blue laser based Nd:YAG active element with sequential parametric downconversion upconversion optical frequencies into red (634 nm), green (532 (451 nm) spectral intervals. This light source provides high-power short (∼10 ns) pulses enables simultaneous formation three interference patterns in a two-path...

Spectral image filtration by means of acousto-optical tunable filters (AOTFs) has multiple applications. For its implementation, a few different optical schemes are in use. They differ quality, number coupling components, dimensions and alignment complexity. To choose the system AOTF-based spectral imager properly, many factors have to be considered. Though various acousto-optic (AO) been tested discussed, their comparative analysis not reported up now. In this study, we assembled four most...

Subject of study. Methods for designing unified optical schemes acousto-optical imaging spectrometers various purposes are studied. Aim The aim is to create a scheme that functions effectively with both single and double monochromators without compromising image quality. Method. proposed method involves two stages: the formation special multiconfiguration optimization parameters in computer-aided design calculating spatial-spectral calibration completed spectrometer. Main results. A compact,...

In this paper, we present a novel approach to spectral stereoscopic imaging. It is based on simultaneous filtration of two light beams with tunable acousto-optical filter (AOTF) original design. does not require large crystals and complicated optical relay systems, because diffract in the same volume crystal medium but at different angles. We show that geometry can be composed common-type AO cell triangular prisms material. derive equations, which specify prism angles ensuring necessary...

Optical biomedical imaging in short wave infrared (SWIR) range within 0.9–1.7 μm is a rapidly developing technique. For this reason, there an increasing interest cost-effective and robust hardware for hyperspectral data acquisition range. Tunable-filter-based solutions are of particular as they provide image processing flexibility effectiveness terms collected volume. Acousto-optical tunable filters (AOTFs) unique set features necessary high-quality SWIR imaging. In paper, we discuss...

In this paper, we demonstrate that combining a laser heating (LH) system with tandem acousto-optical tunable filter (TAOTF) allows us to measure the temperature distribution (TD) across laser-heated microscopic specimen. Spectral image processing is based on one-dimensional (1D) non-linear least squares fitting of Planck radiation function. It applied for determining T at each point (x, y) specimen surface. shown spectral using 1D measurement TD higher precision and stability than those...

We address the optical design procedure of prism-based stereoscopic imaging systems. Conventional approach includes two sequential stages: selection hardware and development proper digital image processing algorithms. At each these stages, specific techniques are applied, which almost unrelated to other. The main requirements system include only key parameters quality. Therefore, insufficient measurement accuracy may be revealed after prototype is assembled tested. In this case, even...

Sources with the possibility to select a narrow spectral band can be applied in many fields of science and technology. One method for selecting single or multiple bands tune their width is acousto-optical filtering conjunction source broadband unpolarized radiation. In this case interval selected owing diffraction an tunable filter. The main problem development such obtainment sufficient luminous flux. Possible configurations optical illumination system allowing increase efficiency flux are...

Subject of study. The study addresses the problem obtaining spectral stereoscopic images in a unique configuration, where single acousto-optical filter is utilized to pair light beams. Aim objective was determine nature changes image quality when varying angle beam separation an further optimize stereo system. Method. imaging scheme implemented through diffraction by ultrasound directions deviated from basic plane (−110) TeO2 crystal cell classical wide-aperture tunable filters. A test-bench...

Abstract A prototype of a spectral imaging module is described which can be attached to conventional rigid and flexible medical endoscopes. It based on acousto-optic tunable filters (AOTF) provides fast image registration at an arbitrary series wavelengths. The main advantage the device minimization spatial distortion by use specialized double AOTF monochromator. These properties ensure immediate reliable detection features in any pixel. Real-time analysis, addition visualization,...

Abstract Acousto-optic (AO) anisotropic interaction in uniaxial birefringent crystals is a widespread and versatile approach to tunable spectral filtration of light. Its principal constraints are limited values angular bandwidth restricting the light transmission imaging performance AO filters. A way overcome these drawbacks simultaneous Bragg diffraction two or more beams. In this paper, we discuss compare main features four available modes wide-aperture interactions crystals. We calculate...

Multi-spectral imaging techniques are widely used in microscopy for many applications. One of the most widespread spectral elements this purpose is an acousto-optic tunable filter (AOTF). AOTF-based contrast visualization especially effective when together with other techniques. Simultaneous utilization two or more imagers requires optical coupling to provide point-to-point matching obtained images. Small linear and angular aperture AOTF additionally hampers development multi-sensor systems...

Spectrally tunable illumination is widely used for colorimetry, spectroscopy, spectral-domain optical coherence tomography and other applications. Most of the swept light sources suffer either from a limited number spectral channels or spatial noise speckles. In this paper, we discuss an approach based on acousto-optic filtration wide-band illumination. We show experimentally that acousto-optical filter (AOTF) provides unique collection features: arbitrary tuning, multi-bandpass mode...

Stereoscopic imagers are widely used in machine vision for three-dimensional (3D) visualization as well non-destructive testing quantitative characterization of cracks, delamination and other defects. Measurement capability these systems is provided by a proper combination the optical parameters data processing techniques. Conventional approach to their design consists two sequential stages: system optimization calibration image algorithms. Such two-stage procedure often complicates both...