We developed a compact, diode-end-pumped, eye-safe laser rangefinder transmitter, which is based on the passively Q-switched Er–Yb:glass laser with a Co:Spinel plate as a saturable absorber (SA). The linear cavity laser considers a concave and a plane mirror with the cavity length is only 20 mm. The repetition rate can be tuned from 1 Hz to 8 Hz at the wavelength of 1535 nm. Our laser system operates stably at peak power > 250 kW and pulse width of 4.5 ns.
This work presents the design, thermal simulation and performance analysis of a diode- end-pumped, eye-safe laser. The finite element method is applied to compute the temperature distribution of Yb:Er glass laser rods end pumped by laser diodes.
The aim of this study is to prepare 18F-NaF radiopharmaceutical using a home-madeautomatic synthesis module consisting of hardware and software which was made by a researcherteam of Hanoi Irradiation Center, HIC, Hanoi, Vietnam. Fluorine-18 isotopes produced in cyclotron KOTRON13 were transferred to the module and radioactive cation impurities were first removed by cation exchange on a carboxymethyl cation exchange (CM) cartridge, and then 18F- ion were trapped by a quaternary methyl ammonium anion exchange (QMA) cartridge. Finally, 18F- was eluated from the cartridge by isotonic saline water (NaCl 0,9% in water) in the form of 18F-NaF. Time of the preparation process was about 13 minutes. Radiochemical yield of the preparation was as high as 95.5%, in average. The qualities of the product were satisfied the criteria of the United StatesPharmacopoeia (USP38). PET/CT bone scaner (skeletal scintigraphy) pre-clinical tests using of the 18 F-NaF product showed good quality of imaging for the entire skeletal and distribution of the 18F-NaF in the kidney and the bladder agreed with it’s natural distribution.
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