Deviation-based wavefront correction using the SPGD algorithm for high-resolution optical remote sensing

Hirose, Masao; Miyamura, Norihide; Sato, Shinri

doi:10.1364/ao.461222

Cited by 9 publications

(2 citation statements)

References 23 publications

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“…Figure 6 shows the images obtained before and after stacking the segment images (a and b) and final optimized PSF (c). The optimization of the adjustment was performed by stochastic parallel gradient descent (SPGD) algorithm [7,8].…”

Section: Preliminary Testingmentioning

confidence: 99%

Design concept of geostationary Earth observation segmented telescope and the wavefront management scheme

Sato

Okamoto

Iki

et al. 2023

International Conference on Space Optics — ICSO 2022

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For crisis management and monitoring, a geostationary Earth observation telescope with large segmented aperture is investigated in JAXA. The preliminary study showed the feasibility of the aperture size of 3.6 m consisted with six primary mirror segments and the fundamental optical design. In order to obtain nearly diffraction limited performance with the optical system in the orbit, the aperture synthesis and wavefront error correction have to be conducted through precise alignment procedure, and therefore the system needs to equip several actuators and sensors dedicatedly designed for the purpose. We constructed the system design through the combination of structural-thermal analysis and optical consideration, and then planned the alignment procedure after launch. Those design concept are planned to be tested in the miniature testbed of segmented optical system under construction. We show the testing equipment and procedure for segment co-phasing and wavefront correction intending in space use.

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Section: Preliminary Testingmentioning

confidence: 99%

Design concept of geostationary Earth observation segmented telescope and the wavefront management scheme

Sato

Okamoto

Iki

et al. 2023

International Conference on Space Optics — ICSO 2022

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“…( 10) gets a maximum modified gradient. The validity of the iterative method is assured by: (i) both the delayed phase and the aberrations induced by the turbulence is composed of several low-order modes, thus can be compensated by a optimized φ c n ( r 0 ) [30]. (ii) G( r r ) will not feature maximum gradient until both the delayed phase and the aberrations caused by the turbulence are compensated [31] by a optimized φ c n ( r 0 ).…”

Section: Principlesmentioning

confidence: 99%

Ghost Synthetic Aperture with Computational Wavefront Shaping

Sun¹,

Nie²,

Li³

et al. 2022

Preprint

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Although optical synthetic aperture has been generally accepted as preferred technique to achieve very large pupil, the optical cophase of all the gaint subapertures is still a difficult task currently.Besides, the associated adaptive optics combatting the atmospheric turbulence presents hard to conduct. Here we demonstrate an incoherent optical synthetic aperture based on lensless ghost imaging method, in which diffraction-limited imaging can be performed even when the distributed sub-sources is non-cophased. Better yet, the wavefront shaping is computationally implement via an iterative algorithm, rather than actual optical modulation process. These enhancement makes the presented technique far easy under current techniques, and promising in many optcial sensing applications.

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Sequential phase diversity for wavefront correction using a deformable mirror with modeling errors

Miyamura,

Hirose,

Sato

2023

Appl. Opt.

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The phase diversity (PD) method is effective for scene-based wavefront sensing and control (WFSC) in spaceborne high-resolution imagers for Earth observation. The simplest way of performing the PD WFSC is offering a diversity wavefront by directly actuating a corrective device, such as a deformable mirror. However, this strategy faces a challenge in constructing a numerical model of the provided diversity wavefront because some corrective actuators’ properties prevent us from precisely determining their deflection behaviors. To avoid this modeling issue, we propose the sequential PD (SPD) method to compensate for static aberration using a corrective device with modeling errors. The SPD WFSC repeats the PD WFSC to gradually correct the aberration, where the estimated corrective wavefront is regarded as the known diversity in the subsequent PD WFSC. The numerical simulation validated that the proposed idea improved the correction performance when a corrective device had a linear modeling error. Additionally, a demonstration experiment succeeded in aberration removal using a face-sheet deformable mirror with inter-actuator coupling and non-linear responses. An additional simulation demonstrated that the proposed method effectively corrected the discontinuous wavefront aberration in multi-aperture imaging systems. The SPD WFSC can potentially bring us optical remote sensing systems with unprecedentedly high resolution.

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Deviation-based wavefront correction using the SPGD algorithm for high-resolution optical remote sensing

Cited by 9 publications

References 23 publications

Design concept of geostationary Earth observation segmented telescope and the wavefront management scheme

Design concept of geostationary Earth observation segmented telescope and the wavefront management scheme

Ghost Synthetic Aperture with Computational Wavefront Shaping

Sequential phase diversity for wavefront correction using a deformable mirror with modeling errors

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