Session Index

Instead of moving the mechanical stage for axial scanning, the wavefront of the laser beam is modulated to effectively move the laser focus. In this paper, a deformable mirror (DM) with tip-tilt compensation is placed at angle of 45 degree with the optical axis so that the reflected laser power efficiency can be maximized due to no beam splitter is required. We have shown the defocus can be successfully performed with the combination of Zernike polynomials even if the DM is not orthogonal to the optical axis. The results are confirmed with home-made Shack-Hartmann wavefront sensor (SHWS).

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A data-driven system identification is implemented to estimate the dynamic model of a tracked vehicle in farm as a state-space linear model for model predictive control (MPC). Compared with conventional MPC with a kinematic model, the computation time of MPC with the identified linear model is saved more than 2/3, and the tracked vehicle with this control approach has achieved superior S-curve and L-shape path following.

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In this study, we investigate the characteristic difference between the two different configurations of the three-dimensional shell-core nanorod LED. We achieve a degree of polarization of 0.545 for tip-free core-shell nanorod LED and 0.188 for tip core-shell nanorod LED by combining the three dimensional (3D) structure LED with photonic crystal. These 3D LEDs may pave the way for future novel optoelectronic components.

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The multiphoton excited fluorescence microscopy adopts ultrashort pulse laser together with a high numerical aperture (NA) objective to induce nonlinear optical effects. But the laser pulse pass through many dispersive elements making pulse width wider, so we have developed a laser pulse compressor with a deformable mirror (DM) to compensate the optical dispersion. The FROG (frequency-resolved optical gating) is used to obtain a spectrogram and DOES (direct optical-dispersion estimation by spectrogram) algorithm would estimate the GDD (group-delay dispersion) in real time. The proposed adaptive ultrashort pulse compressor finally is integrated with home-mode two-photon microscope to improve its fluorescence efficiency.

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Recently, DLP 3D printing has advantages of high resolutions, low cost, and easy operation. However, this technology still exists several technical difficulties that need to be solved. Due to the structure of the LCD, the morphology of the printed sample reveals pixel texture defect under SEM image, which leads to surface irregularity. This research has redesigned the internal LCD system of the 3D printer. The newly designed LCD system has largely alleviated the texture defect caused by the dark zone between pixels. The results successfully demonstrated a nearly perfect surface printed by the modified LCD system without scarifying print resolution.

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Algebraic algorithms are derived for solving aspheric singlets and cemented doublets. Singlets can meet the targets of focal length, spherical aberration, and central coma; cemented doublets can even meet the longitudinal chromatic aberration. Examples are demonstrated, including a DVD-rewritable pickup head singlet and a cemented doublet in a telescope system.

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Using refractive optical elements to first collimate the light emitted by the LED and process the optical design. Then the cylindrical lens array can effectively spread the light pattern in the horizontal direction, homogenize the energy, and suppress the dark area more effectively, which helps shape the high-contrast light patterns.

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Defects in compound semiconductors may decrease the performance of the devices. In this study, we demonstrated the new defect detecting method on silicon carbide (SiC) wafer using multiple swept-source optical coherence tomography (SS-OCT) systems with different central wavelengths, including 1060 nm, 1310 nm, and 1690 nm. The location, distribution, and size of defects in silicon carbide (SiC) wafer were analyzed quantitatively using the volumetric OCT datasets of the SiC sample acquired.

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This paper presents the design of a freeform lens that can convert a Gaussian distributed beam to a specific irradiance while maintaining high collimation. The construction of the lens is based on a numerical method derived from Snell's law.

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