Abstract:
Optically sensitive materials such as sensors (18) or the human eye are passively protected (10) against overexposure to high intensity light (20) in the visible range using a reverse saturable absorber (14) organometallic cluster compound having a core of at least two multiply-bonded transition metal atoms selected from group 8, 6b or 7b of the periodic table. The core atoms are bound together with ligands that permit the formation of a complex. A preferred organometallic cluster compound is cyclopentadienyl iron carbonyl tetramer. As the intensity of incident light increases, the intensity of transmitted light also increases up to a saturation level, but above the saturation level the transmitted light intensity remains substantially constant even with increasing incident light.
Abstract:
A lens (12) converges a light beam (16) into a light absorbing body (14) having a material which exhibits reverse saturable optical absorption distributed therein with a non-uniform concentration. The concentration is maximum at the focal point (20) of the converged light beam (16), and decreases toward the lens (12) with a distribution selected in correspondance with the optical gain of the converged light beam (16) to limit the local fluence of the light beam (16) propagating through the absorbing body (14), and the output energy of the light beam (16), to predetermined maximum values. The non-uniform concentration further produces a self-protecting effect by causing the region of maximum fluence of the converged light beam (16) to shift toward the lens (12), thereby protecting the region of highest optical gain and highest molecular concentration, as the input energy of the light beam (16) increases.
Abstract:
High purity gold films are photochemically deposited on substrates from the gold containing compound (CH3)2Au[CH(COCF3)2]. A vapor of the gold containing organometallic compound, possibly mixed with a carrier gas, is flowed over the surface of the substrate, which is at 0 DEG C. to 160 DEG C., and preferably at ambient temperature. Photodissociation is induced with ultraviolet light, inasmuch as the organometallic compound is strongly absorbing in the range of from about 300 to 340 nanometers. Substantially no organic fragments are deposited upon the surface, so that the deposited gold film is of high purity.
Abstract:
A lens (12) converges a light beam (16) into a light absorbing body (14) having a material which exhibits reverse saturable optical absorption distributed therein with a non-uniform concentration. The concentration is maximum at the focal point (20) of the converged light beam (16), and decreases toward the lens (12) with a distribution selected in correspondance with the optical gain of the converged light beam (16) to limit the local fluence of the light beam (16) propagating through the absorbing body (14), and the output energy of the light beam (16), to predetermined maximum values. The non-uniform concentration further produces a self-protecting effect by causing the region of maximum fluence of the converged light beam (16) to shift toward the lens (12), thereby protecting the region of highest optical gain and highest molecular concentration, as the input energy of the light beam (16) increases.
Abstract:
Une lentille (12) fait converger un faisceau de lumière (16) dans un corps d'absorption de lumière (14) dont la matière présente une absorption optique saturable inverse répartie avec une concentration non uniforme. La concentration est maximale au niveau du foyer (20) du faisceau de lumière convergé (16), et elle diminue vers la lentille (12) avec une répartition choisie en correspondance avec le gain optique du faisceau de lumière convergé (16) afin de limiter la fluence du faisceau de lumière (16) se propageant dans le corps absorbant (14), ainsi que l'énergie de sortie du faisceau de lumière (16), à des valeurs maximales prédéterminées. La concentration non uniforme produit également un effet autoprotecteur en provoquant le décalage de la région de fluence maximum du faisceau de lumière convergé (16) vers la lentille (12), protégeant ainsi la région de gain optique le plus élevé ainsi que la concentration moléculaire la plus élevée, à mesure que l'énergie d'entrée du faisceau de lumière (16) augmente.
Abstract:
Des matériaux optiques sensibles tels que des capteurs (18) ou l'oeil humain sont protégés de manière passive (10) contre la surexposition à la lumière de haute intensité (20) dans le domaine de la visibilté en utilisant un composé en grappe organométallique à solution à absorption saturable inverse (14) ayant un noyau d'au moins deux atomes à métal de transition et à liaison multiple, choisis à partir du groupe 8, 6b ou 7b de la table périodique. Les atomes-noyaux sont liés au moyen de ligands qui permettent la formation d'un complexe. Un composé en grappe organométallique préféré est le tétramère de fer carbonyle cyclopentadiényle. A mesure que l'intensité de la lumière incidente augmente, l'intensité de la lumière transmise augmente aussi jusqu'au niveau de saturation, mais au-dessus du niveau de saturation, l'intensité de la lumière transmise demeure pratiquement constante même lorsque la lumière incidente augmente.
Abstract:
High purity gold films are photochemically deposited on substrates from the gold containing compound (CH3)2Au[CH(COCF3)2]. A vapor of the gold containing organometallic compound, possibly mixed with a carrier gas, is flowed over the surface of the substrate, which is at 0 DEG C. to 160 DEG C., and preferably at ambient temperature. Photodissociation is induced with ultraviolet light, inasmuch as the organometallic compound is strongly absorbing in the range of from about 300 to 340 nanometers. Substantially no organic fragments are deposited upon the surface, so that the deposited gold film is of high purity.