Active aperture synthesis in observation of objects via distorting media

Ustinov, N. D.; Anufriev, A. V.; Vol'pov, A L; Zimin, Yu A; Толмачeв, А. И.

doi:10.1070/qe1987v017n01abeh006451

Cited by 11 publications

(3 citation statements)

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“…[7] Thereafter, several active techniques were proposed that use phase closure. [8,9] Several aspects of these techniques have been analyzed in detail. [10] Similar techniques have been proposed for imaging of extremely small objects, too.…”

Section: N1'roduchonmentioning

confidence: 99%

<title>Reconstruction of images of deep-space objects using Fourier telescopy</title>

Holmes

Brinkley

1999

SPIE Proceedings

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Fourier Telescopy is an imaging method that can form images of very dim objects with angular resolution of a few nanoradians, attained by means of a synthetic aperture that overcomes the effects of intervening aberrations using mathematical algorithms akin to that of long-baseline radio astronomy. The algorithm makes use of phase closure and advanced wavefront reconstruction techniques from adaptive optics and Knox-Thompson image reconstruction. The imaging technique is active and so can be used even with faint objects. The imaging technique is active and encodes the information in the temporal instead of spatial domain, allowing imaging of faint objects with extremely large, low-cost receivers. An implementation for deep space imaging is shown; it uses large-area solar collectors for the receiver, yielding a low-cost, highperformance design. Simulated images are shown for a potential realization ofthe system.

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Section: N1'roduchonmentioning

confidence: 99%

<title>Reconstruction of images of deep-space objects using Fourier telescopy</title>

Holmes

Brinkley

1999

SPIE Proceedings

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“…Single-frequency Nd:YAG laser has a wide range of applications, as optical metrology, high-resolution spectroscopy, coherent detection, [1][2][3][4][5][6][7][8] and especially Fouriertelescopy (FT). [9][10][11][12][13][14][15][16][17][18] To obtain a single-frequency laser, three problems need to be solved, including single longitudinal mode selection, single transverse mode selection, and energy enhancement. For single longitudinal mode selection, several ways have been developed, such as short cavity configuration, [19][20][21][22][23] microchip lasers, [23,24] non-planar ring oscillator, [25][26][27][28][29][30] traveling-wave cavity, [31][32][33][34][35][36][37][38][39] twisting mode lasers, and inserted multi etalons.…”

Section: Introductionmentioning

confidence: 99%

A 37 mJ, 100 Hz, high energy single frequency oscillator*

Shen¹,

Yang²,

Zong³

et al. 2021

Chinese Phys. B

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Ways on energy enhancement for single frequency oscillator are reported in this paper. By quantitative analysis on gain and loss coefficients for each cavity mode with inserted etalons, a 37 mJ, 100 Hz high energy single-frequency Nd:YAG oscillator is obtained. The pulse energy is promoted by enhancement of nearly 7 times for a single frequency oscillator reported. The result proves that this method does help for energy enhancement. It has attractive potential for high energy single frequency oscillator design, especially on condition of intensive side pumped or long cavity laser, where strong competitors exist and are hard to be suppressed.

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“…Such Fourier basis decomposition not only makes it possible to decouple DOF from NA by planar sampling of Fourier space, but also o¤ers great ‡exibility in dynamically controlling the OTF. Although Fourier-domain imaging systems have been proposed in the context of microscopy [16,17] and remote target characterization using Fourier Telescopy [18,19], they have remained largely unexplored in practice due to limited speed and precision of mechanical scanning systems. More recently, a hybrid ‡uorescent imaging technique has been demonstrated combining sparse Fourier basis decomposition without mechanical scanning with high-speed low-resolution lens-based imaging to enhance the resolution of a conventional microscope [20,21,22,23].…”

Section: Introductionmentioning

confidence: 99%

Fourier analysis and synthesis tomography.

Wagner¹,

Sinclair²,

Feldkuhn³

2010

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Most far-…eld optical imaging systems rely on a lens and spatially-resolved detection to probe distinct locations on the object. We describe and demonstrate a novel high-speed wide-…eld approach to imaging that instead measures the complex spatial Fourier transform of the object by detecting its spatially-integrated response to dynamic acousto-optically synthesized structured illumination. Tomographic …ltered backprojection is applied to reconstruct the object in two or three dimensions. This technique decouples depth-of-…eld and working-distance from resolution, in contrast to conventional imaging, and can be used to image biological and synthetic structures in ‡uoresced or scattered light employing coherent or broadband illumination. We discuss the electronically programmable transfer function of the optical system and its implications for imaging dynamic processes. Finally, we present for the …rst time two-dimensional high-resolution image reconstructions demonstrating a three-orders-of-magnitude improvement in depth-of-…eld over conventional lens-based microscopy. 3Intentionally Left Blank 4 Contents

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Active aperture synthesis in observation of objects via distorting media

Cited by 11 publications

References 1 publication

<title>Reconstruction of images of deep-space objects using Fourier telescopy</title>

<title>Reconstruction of images of deep-space objects using Fourier telescopy</title>

A 37 mJ, 100 Hz, high energy single frequency oscillator*

Fourier analysis and synthesis tomography.

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