Towards infrared DDCA with an imaging function

Druart, Guillaume; Barrière, Florence de la; Guérineau, Nicolas; Deschamps, Joël; Fendler, M.; Lhermet, Nicolas; Rulliere, Jacques; Magli, Serge; Reibel, Yann; Moullec, Jean-Baptiste

doi:10.1117/12.883396

Cited by 11 publications

(12 citation statements)

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“…A first strategy to give an imaging function to the dewar consists in reducing the diameter of the cold pupil so that we get a pinhole 2,3 . This strategy is illustrated on Fig.…”

Section: Imagery With a Pinholementioning

confidence: 99%

Design rules for IR micro cameras based on a single diffractive optical element

et al. 2012

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An InfraRed (IR) cooled camera is generally composed by an optical block (warm lenses outside a dewar) and a detection block (a cooled focal plane array inside the dewar). A minimalist approach to design a compact and robust camera consists in giving the dewar an imaging function by replacing the cold pupil by a Diffractive Optical Element (DOE). In this paper we present different DOE that can be used to design the camera. We present first a pinhole camera that validates this approach but that is limited in radiometric performances and in angular resolution. We replace then the pinhole by a continuously self-imaging DOE, such as the diffractive axicon, to improve both the radiometric performances and the angular resolution. Finally, the MALDA 1 is introduced to improve the performances of the axicon. Diffraction effects and Talbot effect under polychromatic light are exposed for such DOE and two different design rules are derived from those effects to allow the design of a compact camera with dimensions compatible with the size of an industrial dewar. Experimental prototypes are presented and radiometric performances are compared and show the best performances for the MALDA.

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“…A first strategy to give an imaging function to the dewar consists in reducing the diameter of the cold pupil so that we get a pinhole 2,3 . This strategy is illustrated on Fig.…”

Section: Imagery With a Pinholementioning

confidence: 99%

Design rules for IR micro cameras based on a single diffractive optical element

et al. 2012

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“…From a practical point of view, we chose T A 293 K and T H 298 K. Then, the NETD is measured around a temperature equal to 295 K. For a single optical axis, NETD one channel jT295 K 15 mK for 50% well fill. It is worth mentioning that we obtained a NETD equal to 20 mK with a camera made of a single traditional lens integrated in the Dewar (described in [22]). …”

Section: Noise Equivalent Temperature Difference (Netd)mentioning

confidence: 99%

“…Because of these packaging conditions, an infrared cryogenic camera has to fulfill several requirements: its optical architecture has to be as simple as possible, and it must have a minimal size. Our approach first consists in integrating a very simple system in the cold shield: it only relies on a traditional lens that images the scene with a very good optical quality [22]. We have also proposed in previous work [8] a cooled multichannel optical system integrated in the cold shield with tilted optical axes to increase the overall FOV.…”

Section: Introductionmentioning

confidence: 99%

Compact infrared cryogenic wafer-level camera: design and experimental validation

et al. 2012

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We present a compact infrared cryogenic multichannel camera with a wide field of view equal to 120°. By merging the optics with the detector, the concept is compatible with both cryogenic constraints and wafer-level fabrication. The design strategy of such a camera is described, as well as its fabrication and integration process. Its characterization has been carried out in terms of the modulation transfer function and the noise equivalent temperature difference (NETD). The optical system is limited by the diffraction. By cooling the optics, we achieve a very low NETD equal to 15 mK compared with traditional infrared cameras. A postprocessing algorithm that aims at reconstructing a well-sampled image from the set of undersampled raw subimages produced by the camera is proposed and validated on experimental images.

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“…Besides, in the same wavelength domain, some studies proposed the integration of optical components in the cryostat of cooled HgCdTe detectors. 1,2 In this case, the use of multiple layers of different materials would lead to the destruction of the integrated component, because of different thermal expansion coefficients. Thus, the development of components with simple architecture is of real interest and has both technological and economical issues.…”

Section: Introductionmentioning

confidence: 98%

Spectral filtering with subwavelength gratings: overview and latest advances

Vincent

Sakat

Ghenuche

et al. 2012

Quantum Sensing and Nanophotonic Devices IX

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We will present a brief overview of the interest in subwavelength gratings for spectral filtering in the mid-infrared wavelength range. Guided-mode, plasmonic and dipolar resonances will be considered. We will particularly focus on components fabricated in our laboratories, achieving band-pass or cut-band filtering. Optical characterization will be shown, revealing resonances with high quality factors. Multispectral camera has been realized by integrating our components into a cooled infrared focal plane array.

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Towards infrared DDCA with an imaging function

Cited by 11 publications

References 0 publications

Design rules for IR micro cameras based on a single diffractive optical element

Design rules for IR micro cameras based on a single diffractive optical element

Compact infrared cryogenic wafer-level camera: design and experimental validation

Spectral filtering with subwavelength gratings: overview and latest advances

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