Development of a new solar adaptive optics system at the Hida Observatory

Miura, Noriaki; Oh-ishi, Ayumu; Aoki, Shotaro; Mogaki, Hikaru; Kuwamura, Susumu; Baba, Naoshi; Hanaoka, Yoichiro; Yamaguchi, Masashi; Ueno, S.; Nakatani, Yusuke; Ichimoto, Kiyoshi

doi:10.1117/12.2055786

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…The limited numbers of subapertures and actuators had almost same contributions to the wavefront errors. We are developing a new full-scaled AO system with higher performances [6]. Using the new AO system, we will make further experiments to state our solar DWFS technique more specifically, not only for the Strehl ratio but also for other factors, such as the SN ratio and dynamic range of the science camera.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…Adaptive optics (AO) systems are being used for solar observation in various observatories [1][2][3]. We are also developing an AO system for the 60-cm domeless solar telescope at the Hida Observatory in Japan [4][5][6], which will be used for various purposes from near ultra violet to near infrared. It is, however, hard to attain full compensation especially in shorter wavelength because of severer influence of turbulence.…”

Section: Introductionmentioning

confidence: 99%

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Deconvolution of partially compensated solar images from additional wavefront sensing

et al. 2016

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A technique for restoring solar images partially compensated with adaptive optics is developed. An additional wavefront sensor is installed in an adaptive optics system to acquire residual wavefront information simultaneously to a solar image. A point spread function is derived from the wavefront information and used to deconvolve the solar image. Successful image restorations are demonstrated when the estimated point spread functions have relatively high Strehl ratios.

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Section: Summary and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deconvolution of partially compensated solar images from additional wavefront sensing

et al. 2016

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“…Instead of a point-like guide star, nonpoint structures of the target are used for the SH-wavefront sensing. This technique has already been used as a correlation-based technique in solar AO 12 – 14 and has gradually been recognized as a scene-based technique in biological microscopy. 15 , 16 In such sensors, correlations between SA images are evaluated to detect their relative shifts.…”

Section: Introductionmentioning

confidence: 99%

Imaging performance of microscopy adaptive-optics system using scene-based wavefront sensing

et al. 2020

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. Significance: A scene-based adaptive-optics (AO) system is developed and a method for investigating its imaging performance is proposed. The system enables derivation of Strehl ratios from observed images via collaboration with computer simulations. The resultant Strehl ratios are comparable with those of other current AO systems. Aim: For versatile and noninvasive AO microscopy, a scene-based wavefront-sensing technique working on a Shack–Hartmann wavefront sensor is developed in a modal control system. The purpose of the research is to clarify the imaging performance of the AO system via the derivation of Strehl ratios from observed images toward applications in microscopy of living cells and tissues. Approach: Two imaging metrics that can be directly measured from observed images (i.e., an energy concentration ratio and unbiased maximum ratio) are defined and related to the Strehl ratio via computer simulations. Experiments are conducted using artificial targets to measure the imaging metrics, which are then converted to Strehl ratios. Results: The resultant Strehl ratios are and 0.5 in the cases of defocus and higher aberrations, respectively. The half-widths at half-maximum of the AO-corrected bead images are favorably comparable to those of on-focus images under simple defocus aberration, and the AO system works both under bright-field illumination and on fluorescent bead images. Conclusions: The proposed scene-based AO system is expected to work with a Strehl ratio of more than 0.5 when applied to high-resolution live imaging of cells and tissues under bright-field and fluorescence microscopies.

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