The Helium-Cadmium laser

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Presentation transcript:

The Helium-Cadmium laser Ronald Mooiweer The Helium-Cadmium laser

The Helium-Cadmium laser Outline General Information Excitation mechanism Lasing transitions Line Broadening Applications Research example Tuesday, 07 April 2009 The Helium-Cadmium laser

The Helium-Cadmium laser General Information cw metal vapor laser Lasing at 325.0 and 441.6 nm Cataphoresis to distribute Cd He leaks, Cd condenses Operating lifetime of about 5,000 hours Tuesday, 07 April 2009 The Helium-Cadmium laser

The Helium-Cadmium laser General Information Tube length: 0.25-1.5 m Bore: 1-2 mm Gas pressure: 5-10 Torr He Gas mixture: He:Cd , 100:1 Operating temperature: 300°C Output power: 10-200 mW Mode: TEM00 or multi-mode Tuesday, 07 April 2009 The Helium-Cadmium laser

The Helium-Cadmium laser Excitation mechanism Penning ionization Electron excitation of Cd+ Photo ionization from He Tuesday, 07 April 2009 The Helium-Cadmium laser

The Helium-Cadmium laser Lasing transitions 325.0 and 353.6 nm : UV 441.6 nm : Blue Tuesday, 07 April 2009 The Helium-Cadmium laser

The Helium-Cadmium laser Line Broadening Isotope broadening> Doppler broadening> Homogeneous broadening Tuesday, 07 April 2009 The Helium-Cadmium laser

The Helium-Cadmium laser Applications 3D stereolithography Mastering compact-disks Creating embossed holograms Photoluminescence analysis Tuesday, 07 April 2009 The Helium-Cadmium laser

The Helium-Cadmium laser 325 nm He-Cd laser Small peaks of green emission suggest oxygen at zinc position in lattice The increase of oxygen pressure contriutes to the ZnO grain size and then promotes UV emission Tuesday, 07 April 2009 The Helium-Cadmium laser