In holographic spectroscopy spurious lines appear during optical reconstruction when the spectral hologram recording goes nonlinear. These ghost lines may lead to wrong interpretation of the observed spectrum in the higher orders. This has been experimentally demonstrated using an Ar-ion laser source in all-line operation. It is shown that the higher-order spectra require careful interpretation when used to enhance resolution in holographic spectroscopy.Résumé. En spectroscopie holographique, des fausses raies apparaissent lors de la reconstruction optique, lorsque l'enregistrement de l'hologramme est non-linéaire. Ces raies fantômes peuvent conduireà une fausse interprétation du spectre observé aux ordres supérieurs. On a démontré expérimentalement cet effet en utilisant une source laserà ions d'argon opérant avec toutes ses raies. On montre que les spectres d'ordre supérieur demandent une interprétation soigneuse quand on les utilise pour augmenter la résolution en spectroscopie holographique.
Diamond was successfully synthesized using an improved radio-frequency (rf) plasma-enhanced chemical vapor deposition system. In this system, conventional capacitively coupled parallel-plate rf (13.56 MHz) discharge plasma was assisted by a compact microwave (2.45 GHz) H2 plasma as a remote hydrogen radical source, and substrate heating was carried out using CO2 laser irradiation. Plasma control in rf discharge region for diamond formation was performed using the hydrogen radical source in this system. This was discussed with optical emission spectroscopy. The hydrogen radical source was improved. When water vapor was mixed to the microwave H2 plasma, namely, using water-vapor-enhanced hydrogen radical source, diamond films were grown at a low substrate temperature of 450 °C.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.