Even small fluences of implanted ions used for opto-doping alpha-quartz lead to amorphization of
the matrix, but subsequent annealing in air or oxygen can restore its crystalline order (chemical
epitaxy). Here we report on cathodoluminescence (CL) spectroscopy during chemical epitaxy of alpha-quartz irradiated with 50-keV Na-ions or 175-keV Rb ions and annealed in 18O2-gas. In particular,
the variation of the CL spectra with the ion fluence will be discussed. The CL spectra at 10 K show
an intense 2.90-2.95 eV blue band and differ greatly from the ones taken at 300 K. Finally we report
on the observation of a spider-web surface structure after Rb implantation and annealing in lowpressure
oxygen.
Laser nitriding of iron is an interesting phenomenon both in physics and industry. On the time scale of hundreds nanoseconds, high intensity (≈108 W/cm2) pulsed excimer laser irradiation on iron in nitrogen atmosphere produced a thin iron nitride layer (thickness > 400 nm) with a mean nitrogen concentration exceeding 10 at which greatly improves the iron surface mechanical properties and the corrosion or erosion resistance. Laser plasma/plume plays a crucial role in the complicated interplay of the laser-plasma-metal system. Since the nitrogen pressure is one of the most important parameters determining the laser plume dynamics, a nitrogen pressure series ranging from 0.05 bar to 10 bar is conducted. The characteristic parameters of the nitrogen depth profile are extracted and their pressure dependence is qualitatively discussed. By isotopic experiments in 15N and natural nitrogen environment, the evolution of the nitrogen depth profile during laser nitriding process is successfully traced. Both of the experimental results suggested that a 1D laser supported combustion wave model is reasonable to describe the lasers plume dynamics.
Conference Committee Involvement (1)
Sixth International Conference on Advanced Optical Materials and Devices
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