Spherical aberration correction suitable for a wavefront controller
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TLDR
The method is based on inverse ray tracing and can generate correction phase patterns whose peak-to-valley values are minimized and is useful in cases where a large phase modulation is needed, such as when employing a high-NA lens or focusing a beam deep inside a sample.Abstract:
We propose a simple method to correct a large amount of spherical aberration caused by a refractive index mismatch The method is based on inverse ray tracing and can generate correction phase patterns whose peak-to-valley values are minimized We also demonstrated spherical aberration correction in a transparent acrylic block using a liquid-crystal-on-silicon spatial light modulator (LCOS-SLM) A distorted focal volume without correction was substantially improved with correction This method is useful in cases where a large phase modulation is needed, such as when employing a high-NA lens or focusing a beam deep inside a sampleread more
Citations
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Adaptive metalenses with simultaneous electrical control of focal length, astigmatism, and shift
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Liquid crystal lenses with tunable focal length
TL;DR: In this article, the fundamental optics of lenses and its extension to lenses made of liquid crystals (LCs) are described, namely, lenses with curved surfaces, flat gradient-index lenses and composite lenses.
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Metalenses: Advances and Applications
Ming Lun Tseng,Ming Lun Tseng,Hui Hsin Hsiao,Hui Hsin Hsiao,Cheng Hung Chu,Cheng Hung Chu,Mu Ku Chen,Mu Ku Chen,Greg Sun,Ai Qun Liu,Din Ping Tsai,Din Ping Tsai +11 more
TL;DR: In this article, a review of the progress in the development of metalenses is presented, where the working mechanisms of chromatic and achromatic metalenses are introduced. And the design principle of integrated-resonant units for correcting chromatic aberration of a metalens is discussed.
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Development of PET Detectors Using Monolithic Scintillation Crystals Processed With Sub-Surface Laser Engraving Technique
Takahiro Moriya,Kenshi Fukumitsu,T. Sakai,S. Ohsuka,Tatsuki Okamoto,H. Takahashi,Mitsuo Watanabe,T. Yamashita +7 more
TL;DR: In this paper, a sub-surface laser engraving (SSLE) technique was applied to a monolithic scintillation block for fine segmentation in the crystal without inter-pixel gaps.
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Adaptive optical versus spherical aberration corrections for in vivo brain imaging.
TL;DR: This work characterized and compared its performance with adaptive optics in the context of in vivo brain imaging with two-photon fluorescence microscopy and found that the presence of sample tilt had a deleterious effect on the performance of SA-only correction.
References
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Photowritten optical waveguides in various glasses with ultrashort pulse laser
TL;DR: In this article, permanent optical waveguides can be formed in various bulk glasses by photoinduced refractive index change with an ultrashort pulse laser, which can be fabricated by focusing the laser beam through an microscope objective and translating the sample parallel to the axis of the beam.
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Infrared photosensitivity in silica glasses exposed to femtosecond laser pulses
TL;DR: The use of infrared femtosecond laser pulses to induce highly localized refractive-index changes in fused-silica glasses is investigated and the potential of this technique for writing three-dimensional photonic structures in bulk glasses is demonstrated by the fabrication of a Y coupler within a sample of pure fused silica.
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Fabrication and analysis of a directional coupler written in glass by nanojoule femtosecond laser pulses.
TL;DR: A directional coupler written in a glass sample by the focused 400-nm output from a 25-fs oscillator is reported; the coupler is single mode; the splitting ratio is 1.9 dB at 633 nm.
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Aberration correction for confocal imaging in refractive‐index‐mismatched media
TL;DR: In this article, it was shown that it is sufficient to correct only the first two or three orders of spherical aberration to restore adequate image signal level and optical resolution, at imaging depths of up to 50-100 wavelengths.
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Adaptive correction of depth-induced aberrations in multiphoton scanning microscopy using a deformable mirror
TL;DR: Adaptive aberration correction for depth‐induced spherical aberration in a multiphoton scanning microscope with a micromachined deformable mirror using a genetic learning algorithm with two‐photon fluorescence intensity feedback is demonstrated.