Laser processing of diamond have attracted attention. Ultrashort laser pulses can be used for micro-structuring on diamond and in bulk diamond. In this paper, we report on laser parameters for surface structuring of diamond by using femtosecond laser pluses at a repetition rate of 1 kHz. By changing scanning speed and energy, different types of grooves were inscribed. The morphology and depth of grooves were investigated.
Mobile phone technology has led to implementation of portable and inexpensive microscopes. Light-emitting diode (LED) array microscopes support various multicontrast imaging by flexible illumination patterns of the LED array that can be achieved without changing the optical components of the microscope. Here, we demonstrate a mobile-phone-based LED array microscope to realize multimodal imaging with bright-field, dark-field, differential phase-contrast, and Rheinberg illuminations using as few as 37 LED bulbs. Using this microscope, we obtained high-contrast images of living cells. Furthermore, by changing the color combinations of Rheinberg illumination, we were able to obtain images of living chromatic structures with enhanced or diminished contrast. This technique is expected to be a foundation for high-contrast microscopy used in modern field studies.
The light emitting diode (LED) array microscope enables various multi-contrast imaging such as bright-field, darkfield and differential phase-contrast by various illumination patterns without any expensive optical components. We build an LED array microscopic system operated with Raspberry Pi. Illumination patterns are controlled with Raspberry Pi and images are obtained with a Raspberry Pi camera module. We demonstrate acquisition of bright-field, dark-field, and differential phase-contrast of cells.
The light emitting diode (LED) array microscope enables various multi-contrast imaging such as bright-field, dark- field and differential phase-contrast (DPC) by various illumination patterns without any expensive optical components. We built LED array microscopic system that enables us to obtain multi-contrast images with a smartphone camera. We demonstrate that a smartphone-based LED array microscope can acquire bright field, dark field, and DPC of cell by changing the numerical apertures of objective lenses.
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