2D-representation of a laser structured Ti-Al-V alloy sheet
With a laser scanning microscope (LSM), it is possible to investigate metallic, ceramic and polymer materials, both transparent or opaque with respect to their surface properties. The technique is contact free and nondestructive.
The confocal principle means that slices with a defined, narrow focus are recorded along the normal on the sample (z-stack). From this data, a three dimensional model of the sample surface is computed. The technique delivers information about the surface topology and thus allows the determination of roughness, corrugation and layer thickness.
The use of a violet laser in combination with objectives of high numerical aperture results in a lateral line resolution of 120 nm. In z-direction, a resolution of 20 nm is feasible. The measuring range parallel to the optical axis ranges from 14.5-0.23 mm, depending on the selected resolution and field of view. Surfaces inclined up to 73° are measurable at highest resolution. Due to the motorized x/y stage, images can be automatically acquired far beyond the optical field of view. The system basis is formed by a conventional microscope for reflected light.
• Model: Zeiss LSM 700
• Laser: violet (λ = 405 nm)
• Objectives: 5x/NA0,13; 10x/NA0,3; 20x/NA1,7; 50x/NA0,95 and 100x/NA0,95
• X-/Y-scanning table: operating range 130 x 85 mm