The efficiency potential of a small-size solar-pumped laser is studied here. solar head was composed fused silica aspheric lens and conical pump cavity, which coupled redistributed the concentrated radiation from focal zone parabolic mirror with an effective collection area 0.293 m2 to end-side Ce (0.1 at%):Nd (1.1 at%):YAG rod 2.5 mm diameter 25 length. Optimum design parameters were found thr...

Low tracking accuracy of trackers, structure vibration by winds, and lens deformation temperature lead to non-vertical incident irradiation Fresnel lens, which necessitates a secondary concentrator in actual engineering application concentrating photovoltaic module. In this study, focusable uniform convergence microprism is added between solar cell improve efficiency focal spot energy uniformit...

Optical coherence tomography is a well-known technique for the optical imaging biological tissues. However, depth scanning range of high-resolution restricted by its focus. In this study, Zinc Selenide (ZnSe) Microlens Array (MLA) employed to overcome depth-of-focus limitation tomography. The ZnSe material with low Abbe number and high chromatic dispersion extends focus transverse resolution. M...

A freeform imaging telescope (FIT) can achieve a large field of view, high resolution, light weight, and small volume at the same time. Single-point diamond turning (SPDT) is usually used to fabricate FITs, which made entirely aluminum alloy. Compared with traditional telescope, whose reflector glass structure aluminum, coefficient thermal expansion (CTE) non-conforming, CTE in an all-aluminum ...

Nonlinear sampling of the interferograms in wavenumber (k) space degrades the depth-dependent signal sensitivity in conventional spectral domain optical coherence tomography (SD-OCT). Here we report a linear-in-wavenumber (k-space) spectrometer for an ultra-broad bandwidth (760 nm-920 nm) SD-OCT, whereby a combination of a grating and a prism serves as the dispersion group. Quantitative ray tra...

In computational camera research, people design unconventional optics to sample the light field in a way that is radically different from the traditional camera and preserve new forms of visual information for various applications. When one has an idea of optics design, it is very often that an evaluation based on simulation has to be conducted first before building a real system. However, how ...

We propose and demonstrate the concept of using a tuneable liquid crystal micro-lens (LCML) array to improve the image contrast of a pixelated thin film photo-transistor (TFPT) flat panel imager. Such a device can be used to image contents on paper-based media and display a magnified version on a flat panel display for elderly or visually impaired people. Practical aspects including device phys...

A handheld, forward-imaging, laser-scanning confocal microscope (LSCM) demonstrating optical sectioning comparable with microtome slice thicknesses in conventional histology, targeted towards interventional imaging, is reported. Fast raster scanning (approximately 2.5 kHz line scan rate, 3.0-5.0 frames per second) was provided by a 2-axis microelectromechanical system (MEMS) scanning mirror fab...

We report on liquid-based tunable-focus microlens arrays made of a flexible polydimethylsiloxane (PDMS) polymer. Each microlens in the array is formed through an immiscible liquid–liquid interfacial meniscus. Here deionized water and silicone oil were used. The liquids were constrained in the PDMS structures fabricated through liquid-phase photopolymerization for molding and soft lithography. T...

BACKGROUND In this study, the effects of intraocular lenses (IOLs) with different diopters (D) on chromatic aberration were investigated in human eye models, and the influences of the central thickness of IOLs on chromatic aberration were compared. METHODS A Liou-Brennan-based IOL eye model was constructed using ZEMAX optical design software. Spherical IOLs with different diopters (AR40e, AMO...