Dye laser

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  • LASER lỏng có môi trường hoạt tính là chất lỏng bao gồm các chất Chelasten như Peperindin Eu(BA)4 hòa tan trong dung môi rượu Ethol + Methol và có ít ion nguyên tố hiếm Eu3+, Nd3+….: các dung dịch thuốc nhuộm( các laser màu)… Hiện nay người ta phân laser lỏng ra làm ba loại: - Laser chelate hữu cơ- đất hiếm - Laser vô cơ oxyd chloride- neodym-selen - Laser màu (dye laser)

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  • Hơn 20 năm qua, Laser “nhuộm màu” tia dạng xung (pulsed dye Laser PDL) luôn được đánh giá là “tiêu chuẩn vàng” (gold standard), an toàn và hiệu quả nhất trong ứng dụng trị liệu các tổn thương mạch máu, đặc biệt là các bớt rượu vang đỏ (Port Wine Stain), u máu (hemangiomas)… Công nghệ Laser “nhuộm màu” tia (PDL) được phát minh ra từ giữa những năm 1980. Độc đáo của công nghệ này là tạo ra năng lượng đỉnh rất cao trong một thời gian rất ngắn.

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  • Lasers continue to be an amazingly robust field of activity, one of continually expanding scientific and technological frontiers.

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  • Excimer lasers are pulsed gas lasers that intrinsically offer efficient and powerful broadband emission at several spectral regions throughout the ultraviolet. The spectral widths are typically 2 nm. An exception to this categorization is the XeF laser urith its broadly tunable C+A transition (approximately 50 nm) in the visible. The broad tunability results from the steeply repulsive A state.

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  • This system has been set up and it generates selected wavelenghts at 282.9 nm and 286.4 nm with the energy of 30 µJ/pulse and 60 µJ/pulse respectively. A DIAL system using this UV transmitter is designed to measure the vertical distribution of ozone with high temporal and spatial resolution. Our simulations of received DIAL signal indicate that the altitude of ozone distribution measurement can reach to over 5000 m along with range resolution of 100 m.

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  • the generation of ultrashort laser pulses. Beginning with mode-locking of glass lasers in the 1960s, the development of dye lasers brought the pulse width down from picoseconds to femtoseconds. The breakthrough in solid state laser pulse generation provided the current reliable table-top laser systems capable of average power of about 1 watt, and peak power density of easily watts per square centimeter, with pulse widths in the range of four to eight femtoseconds.

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  • Solid state lasers include lasers based on paramagnetic ions, organic dye molecules, and color centers in crystalline or amorphous hosts. Semiconductor lasers are included in this section because they are a solid state device, although the nature of the active center— recombination of electrons and holes—is different from the dopants or defect centers used in other lasers in this category.

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  • Flow cytometry is a technology that simultaneously measures and analyses multiple physical characteristics of single particles, usually cells, as they flow in a fluid stream through a beam of light. The properties measured include a particle’s relative size (represented by forward angle light scatter), relative granularity or internal complexity (represented by right-angle scatter), and relative fluorescence intensity.

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  • Regions and gates can be made to better separate and analyze populations of interest. Furthermore, on the basis that the dyes used to stain cells have overlapping emission spectra, the compensation is normally made to reduce interference. While basic instruments may only permit the simultaneous collection of two or three fluorescence signals, the more complex and expensive research instruments mean that it is possible to obtain more than 14 parameters (Winson & Davey, 2000; Chattopadhyay et al., 2008) depending on the laser equipment utilized.

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