Searcharxiv⌕ Search

arXiv subjects

Weliton Soares Martins

Publications and source records attributed to Weliton Soares Martins.

3 recordsLinked to original sources
arXiv2013

Selective reflection technique as a probe to monitor the growth of a metallic thin film on dielectric surfaces

Controlling thin film formation is technologically challenging. The knowledge of physical properties of the film and of the atoms in the surface vicinity can help improve control over the film growth. We investigate the use of the well-established selective reflection technique to probe the thin film during its growth, simultaneously monitoring the film thickness, the atom-surface van der Waals interaction and the vapor properties in the surface vicinity.

physics.atom-ph↗
arXiv2012

Two-beam nonlinear Kerr effect to stabilize laser frequency with sub-Doppler resolution

Avoiding laser frequency drifts is a key issue in many atomic physics experiments. Several techniques have been developed to lock the laser frequency using sub-Doppler dispersive atomic lineshapes as error signals in a feedback loop. We propose here a two-beam technique that uses non-linear properties of an atomic vapor around sharp resonances to produce sub-Doppler dispersive-like lineshapes that can be used as error signals. Our simple and robust technique has the advantage of not needing either modulation or magnetic fields.

physics.atom-ph↗
arXiv2012

Laser stabilization to an atomic transition using an optically generated dispersive lineshape

We report on a simple and robust technique to generate a dispersive signal which serves as an error signal to electronically stabilize a monomode cw laser emitting around an atomic resonance. We explore nonlinear effects in the laser beam propagation through a resonant vapor by way of spatial filtering. The performance of this technique is validated by locking semiconductor lasers to the cesium and rubidiumD2 line and observing long-term reduction of the emission frequency drifts, making the laser well adapted for many atomic physics applications.

physics.atom-ph↗