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Browsing Publications by Author "Alessi, D., author"

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    Continuous high-repetition-rate operation of collisional soft-x-ray lasers with solid targets
    (Colorado State University. Libraries, 2006) Rocca, Jorge J., author; Marconi, M. C., author; Alessi, D., author; Luther, B. M., author; Wang, Y., author; Larotonda, M. A., author; Weith, A., author; Optical Society of America, publisher
    We have generated a laser average output power of 2 μW at a wavelength of 13.9 nm by operating a tabletop laser-pumped Ni-like Ag laser at a 5 Hz repetition rate, using a solid helicoidal target that is continuously rotated and advanced to renew the target surface between shots. More than 2×104 soft-x-ray laser shots were obtained by using a single target. Similar results were obtained at 13.2 nm in Ni-like Cd with a Cd-coated target. This scheme will allow uninterrupted operation of laser-pumped tabletop collisional soft-x-ray lasers at a repetition rate of 10 Hz for a period of hours, enabling the generation of continuous high average soft-x-ray powers for applications.
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    Demonstration of high-repetition-rate tabletop soft-x-ray lasers with saturated output at wavelengths down to 13.9 nm and gain down to 10.9 nm
    (Colorado State University. Libraries, 2005) Rocca, Jorge J., author; Shlyaptsev, V. N., author; Berrill, M., author; Alessi, D., author; Luther, B. M., author; Larotonda, M. A., author; Want, Y ., author; American Physical Society, publisher
    Saturated tabletop lasers operating at 5 Hz repetition rate with average powers gt;1 μW were demonstrated at wavelengths between 16.5 and 13.9 nm in the 4d 1S0-4p 1P1 transitions of Ni-like ions. The results were obtained using picosecond laser heating pulses with an energy of only 1 J by optimizing the angle of incidence for maximum energy deposition. Lasing was also observed for shorter wavelength transitions of the same isoelectronic sequence, with amplification in the 11.9 nm line of Ni-like Sn approaching gain saturation, and progressively reduced gain for wavelengths as low as 10.9 nm for Ni-like Te. These high repetition rate soft x-ray lasers will enable new applications in science and the development of unique metrology and processing tools for industry.
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    High repetition rate operation of saturated tabletop soft x-ray lasers in transitions of neon-like ions near 30 nm
    (Colorado State University. Libraries, 2005) Rocca, Jorge J., author; Alessi, D., author; Luther, B. M., author; Wang, Y., author; Larotonda, M. A., author; Berrill, M., author; Optical Society of America, publisher
    We report average powers exceeding 1 microwatt in laser transitions of Ne-like ions at wavelengths near 30 nm. Gain-saturated operation was obtained at a repetition rate of 5 Hz exciting solid targets with pump pulses of ~1 J energy and 8 ps duration impinging at grazing incidence of 20 degrees. Gain-length products of about 20 were obtained in the 30.4 nm and 32.6 nm transitions of Ne-like V and Ne-like Ti respectively. Strong lasing was also observed in Ne-like Cr at 28.6 nm and in the 30.1 nm line of Ne-like Ti.
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    Saturated 13.2 nm high-repetition-rate laser in nickellike cadmium
    (Colorado State University. Libraries, 2005) Alessi, D., author; Berrill, M., author; Luther, B. M., author; Larotonda, M. A., author; Wang, Y., author; Rocca, Jorge J., author; Optical Society of America, publisher
    We report gain-saturated operation of a 13.2 nm tabletop laser in Ni-like Cd at a 5 Hz repetition rate. A gain-length product G×L=17.6 was obtained by heating a precreated plasma with 8 ps duration Ti:sapphirelaser pulses with an energy of only 1 J impinging at a grazing angle of 23°. With an average power of ~1 mW, this laser is an attractive coherent source for at-wavelength metrology of extreme UV lithography optics and other applications.
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    Saturated high-repetition-rate 18.9-nm tabletop laser in nickellike molybdenum
    (Colorado State University. Libraries, 2005) Shlyaptsev, V. N., author; Rocca, Jorge J., author; Marconi, M. C., author; Berrill, M., author; Alessi, D., author; Larotonda, M. A., author; Wang, Y., author; Luther, B. M., author; Optical Society of America, publisher
    We report saturated operation of an 18.9-nm laser at 5-Hz repetition rate. An amplification with a gain-length product GL of 15.5 is obtained in the 4d 1S0―4p 1P1 laser line of Ni-like Mo in plasmas heated at grazing incidence with ~1-J pulses of 8.1-ps duration from a tabletop laser system. Lasing is obtained over a broad range of time delays and pumping conditions. We also measure a GL of 13.5 in the 22.6-nm transition of the same ion. The results are of interest for numerous applications requiring high-repetition-rate lasers at wavelengths below 20 nm.