Stray light characterization with ultrafast time-of-flight imaging

Clermont, Lionel; Uhring, Wilfried; Georges, Marc

doi:10.1038/s41598-021-89324-y

Cited by 17 publications

(6 citation statements)

References 32 publications

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“…This would solve the three fundamental issues of conventional approaches, it would make the interpretation easier, would allow to identify the origin of potential problems, and it would discriminate the stray light from the measurement device. This is exactly what we have done recently and demonstrated with a refractive optical system [8], with a streak camera setup. This will be described in the next section.…”

Section: Introductionsupporting

confidence: 84%

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A new paradigm in the field of stray light control and characterization enabled by ultrafast time-of-flight imaging

Clermont

Uhring²,

Georges

et al. 2022

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V

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Space telescopes require always better stray light control. However conventional characterization methods rely on the same principles since several decades and we are reaching the limits of their capabilities. We have developed a disruptive approach which solves these limitations: stray light characterization by ultrafast time of flight imaging. By using a pulsed laser source and an ultrafast sensor, we are able to discriminate and identify individual stray light contributors, thus providing the ultimate understanding of the stray light origins in an instrument. In this paper, we present our approach and its potential for the future of space telescopes. We will present the experimental characterization of a refractive telescope with this method, using a streak camera and a fs laser. We will present how we use this approach was used to experimentally characterize, validate and improve a stray light measurement facility, using a SPAD sensor and a ps laser.

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Section: Introductionsupporting

confidence: 84%

“…The issues with the conventional approach is the following [8] [9]. First, stray light measurements are hard to interpret.…”

Section: Introductionmentioning

confidence: 99%

A new paradigm in the field of stray light control and characterization enabled by ultrafast time-of-flight imaging

Clermont

Uhring²,

Georges

et al. 2022

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V

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“…This will however require to be able to adapt theoretical SL models to the reality of experiments, which is a complex task when many ghosts are present. Ultrafast SL characterization is an interesting prospect for that matter as it can be used for reverse engineering the SL properties of an instrument [30,31].…”

Section: Discussionmentioning

confidence: 99%

Stray Light Correction Algorithm for High Performance Optical Instruments: The Case of Metop-3MI

2022

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Stray light is a critical aspect for high performance optical instruments. When stray light control by design is insufficient to reach the performance requirement, correction by post-processing must be considered. This situation is encountered, for example, in the case of the Earth observation instrument 3MI, whose stray light properties are complex due to the presence of many ghosts distributed on the detector array. We implement an iterative correction method and discuss its convergence properties. Spatial and field binning can be employed to reduce the computation time but at the cost of a decreased performance. Interpolation of the stray light properties is required to achieve high performance correction. For that, two methods are proposed and tested. The first interpolate the stray light in the field domain while the second applies a scaling operation based on a local symmetry assumption. Ultimately, the scaling method is selected and a stray light reduction by a factor of 58 is obtained at 2σ (129 at 1σ) for an extended scene illumination.

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“…Interference testing cannot be performed when the crosstalk fringes are significant. Many studies on incoherent stray lights in optical systems and related simulation software have been conducted [6][7][8][9]; however, no simulation software is available for the interference compensation testing of coherent stray lights [10]. There is little research in this field, and existing studies have been unable to obtain specific information on the size and intensity of crosstalk fringes.…”

Section: Introductionmentioning

confidence: 99%

Research on Coherent Stray Light Fringes in Interference Compensation Testing

Sun,

Cheng,

et al. 2024

Photonics

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Testing accuracy is an essential factor in determining the manufacturing accuracy of aspheric mirrors. Because of the complexity of the null compensation test, the coherent stray lights generated by multiple reflections and transmissions between optical elements and the crosstalk fringes generated by the multi-beam interference of the reference light, test light, and stray lights are superimposed on the interference fringes, resulting in reduced testing accuracy. Focusing on this problem, a simulation analysis method for crosstalk fringes based on ray-tracing and multi-beam interference in interference testing is proposed. The coordinates, amplitudes, and phases of the test light and stray lights on the transmission sphere are traced, and the crosstalk fringes and interference testing fringes and their positions, sizes, and intensity information are simulated via multi-beam interference. The influence of crosstalk fringes on interference fringes is determined. An experimental optical path is built to verify the correctness of the crosstalk fringe simulation method.

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Stray light characterization with ultrafast time-of-flight imaging

Cited by 17 publications

References 32 publications

A new paradigm in the field of stray light control and characterization enabled by ultrafast time-of-flight imaging

A new paradigm in the field of stray light control and characterization enabled by ultrafast time-of-flight imaging

Stray Light Correction Algorithm for High Performance Optical Instruments: The Case of Metop-3MI

Research on Coherent Stray Light Fringes in Interference Compensation Testing

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