A. J. Mendelsohn

Bio: A. J. Mendelsohn is an academic researcher from Stanford University. The author has contributed to research in topics: Autoionization & Laser pumping. The author has an hindex of 4, co-authored 5 publications receiving 75 citations.

Quasi-metastable quartet levels in alkalilike atoms and ions.

Abstract: We describe the properties of a subclass of quartet levels of alkalilike atoms and ions that often retain metastability against autoionization and may have large radiative yields. Gain cross sections for XUV lasers with wavelengths between 20 and 100 nm are given.

Improved performance of the microwave-pumped XeCl laser

Abstract: Significant improvements in pulse length (200 ns), output power (500 W), and repetition rate (400 Hz) of the microwave-pumped XeCl laser are reported. Efficient coupling of microwave power into Ne at pressures up to 17 atm has been demonstrated.

Proposal for an extreme-ultraviolet selective autoionization laser in Zn III.

Abstract: A system is proposed whereby Zn atoms that are photoionized by soft x rays from a laser-produced plasma undergo selective super-Coster–Kronig decay leading to inversion and lasing on several XUV Zn iii transitions. Calculations indicate that lasing will occur when a moderate-sized (∼10-J) 1.06-μm pump laser is used.

Extreme-ultraviolet emission spectra of core-excited levels in sodium and magnesium

Abstract: Using a pulsed-hollow-cathode discharge, we have observed the emission spectra of core-excited levels of Na i and Mg ii. Line identifications and implications for extreme-ultraviolet lasers are discussed.

Quasi-Metastable Energy Levels and Applications

Abstract: The paper summarizes the properties of certain radiating levels of the column I metals. XUV emission studies and an absorption experiment on the 1091 A line of neutral Cs are described. A technique for correlating picosecond, broadband XUV pulses is discussed.

Preionization and discharge stability study of long optical pulse duration UV-preionized XeCl lasers

Abstract: This paper presents a complete study of the temporal and spatial characteristics of the preionization of a XeCl rare-gas halide laser. The detailed study was made possible using the technique of laser-induced preionization which utilizes the uv radiation from a KrF laser to preionize a second rare-gas halide laser. In addition to the preionization study, high spatial and temporal resolution framing camera photographs have been used to investigate the growth of discharge instabilities which can lead to the premature termination of the XeCl optical pulse. The roles played by HCl, Xe, the buffer gas as well as the discharge energy loading in the development of discharge instabilities have been determined experimentally.

Wavelengths, Transition Probabilities, and Energy Levels for the Spectra of Sodium (NaI–NaXI)

Abstract: Energy levels, with classifications and uncertainties, have been compiled for the spectra of the neutral atom and all positive ions of sodium (Z=11). Wavelengths with classifications, intensities, and transition probabilities are also tabulated. In addition, ground states and ionization energies are listed. Where available, the hyperfine structure constants and the percentages of the leading components of the energy levels are included. For all ionization stages of sodium, at least some experimental data are available; however, for those for which only a few transitions have been measured, theoretical calculations or values obtained by isoelectronic fitting are reported. Similarly, theoretical or isoelectronically determined ionization energies are given when they are thought to be more accurate than the available experimental data would produce.

Saturation of the Xe III 109-nm laser using traveling-wave laser-produced-plasma excitation

Abstract: We describe the construction and operation of a 109-nm, photoionization-pumped, single-pass laser in Xe iii. The laser is pumped by soft x rays emitted from a laser-produced plasma in a traveling-wave geometry. Using a 3.5-J, 300-psec, 1064-nm laser pump pulse, we measure a small-signal gain coefficient of 4.4 cm−1 and a total small-signal gain of exp(40). The laser is fully saturated and produces an output energy of 20 μJ in a beam with 10-mrad divergence.

Ultranarrow linewidth, magnetically switched, long pulse, xenon chloride laser

Abstract: A spectral linewidth of less than 70 fm and diffraction-limited beam divergence have been obtained from a long-pulse, electric-discharge xenon chloride laser with intracavity Fabry-Perot etalons. A gain duration of 100 ns provided for multipass operation of the etalons, significantly improving both contrast and finesse. The electrical-discharge circuit required to produce this long gain duration was comprised of a pulse-forming network, a saturable-inductor magnetic switch, and a tapered constant-impedance interface transmission line.