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A large‐aperture unstable‐resonator TEA CO 2 oscillator has been mode locked by injection of nanosecond pulses chopped from the 1‐W output of a cw CO 2 oscillator. Power gains of ∼10 12 and a locking window of ∼200 ns have been observed.
We have measured the two‐photon autocorrelation function of ultrashort CO 2 laser pulses generated by optical free induction decay. The pulse duration was determined as a function of the pressure in the resonant absorber. At a pressure of 250‐Torr 30‐psec optical pulses were produced.
Long‐pulse operation of the XeF laser has been achieved utilizing electron beam excitation of Ar/Xe/NF 3 gas mixtures. For a total mixture pressure of 2.5 atm, ∼0.30 J of 350‐nm radiation was obtained in a 1‐μs FWHM pulse.
The lattice parameters of boron‐implanted silicon layers have been measured by an x‐ray diffraction technique. The rocking curves show an expansion volume which anneals in several stages: 100, 280, and 400–600 °C. Around 600 °C, an almost stress‐free crystal is found. This result...
Picosecond third harmonic (353 nm) Nd : glass laser pulses have been amplified by factors of ≳6 000 in a high‐pressure XeF discharge. Peak powers ∼50 kW have been observed.
Intense laser pulses with peak powers in excess of 0.5 MW have been obtained routinely at 4278 Å (0, 1) band of B 2 Σ + u – X 2 Σ + g system from a unique spark‐preionized large‐volume TE laser. High‐pressure operation of this laser with N 2 (3371 Å), Ar (0.912, 0.962, 1.270, 1.791...
Hard conducting diamond layers were produced by carbon implantation. Above a threshold implantation dose (≃3×10 16 /cm 2 ), these layers possess the high conductivity of graphite (≃10 −2 Ω −1 cm −1 ) and a hardness intermediate between that of silicon and diamond.
A superconducting microbridge small enough to exhibit the Josephson effect has been shunted by a large external capacitance. Surprisingly little capacitive hysteresis is observed in its I ‐ V characteristic. Prominent subgap structures are seen. The resistively shunted junction (RSJ) model...
Absorption by air in the optical cavity of an ArF discharge laser removes the 16 O 2 Schumann‐Runge lines from the broad lasing output centered at 193 nm. Subsequent irradiation of an oxygen cell induces photochemistry of 17 O and 18 O, resulting in isotopically enriched ozone.
A method for measuring angular distributions of individual x‐ray line intensities from laser‐produced plasmas is described and applied to measure the strong angular dependence of lines from an aluminum plasma. The data are consistent with calculations made with a simple plasma model...
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