The radiation pressure forces for Au nanoparticles in the Rayleigh regime under the influence of a coherent source of infrared light from 0.7-1.5 μm of a Gaussian beam with fundamental mode corresponding to the TEM00 mode are studied. An intensity distribution of the source in terms of the spot size and power are considered to analyze the gradient, scattering and absorption forces on a sphere located arbitrarily on a Gaussian beam. The results have shown, through an analysis stability, the optical manipulation is better suited for longer wavelengths, small particles, and a beam waist significantly reduced.
On this work we present a Titanium:Sapphire laser with simultaneous dual wavelength operation in the 890 nm region.
Dual wavelength operation is obtained using a novel four stage birefringent filter in which we can control wavelength
separation by tilting one of the filter elements. The laser operates in continuous wave pumped by a 5.5 Watts 532 nm
source producing 100 mW at both wavelengths. We obtained wavelength operation with separation of 2.0 nm to 3.0,
corresponding to frequency separation between 0.8 THz to 1.2 THz. The ultimate goal is the development of a source in
the terahertz (THz) region of the electromagnetic spectrum for medical applications.
In this work we present a security system that uses an optical key as control access device. The optical key is a computer
generated hologram (CGH) recorded using optical damage onto a transparent material using a high power pulsed laser.
When we reproduce the CGH with a laser we obtain the codified image on the holographic plane. Placing a camera in
this plane the reconstructed image is captured. Using a comparing program that contains the prerecorded security image
the access is authorized or denied.
In this work we demonstrate direct writing of a computer generated hologram using optical damage in glass as a possible recording process. The recording was performed by ablation in BK7 optical glass. We used a 10 Hz, 35 picoseconds, 5 mJ Nd:YAG pulse focused using a lens to create 50 μm spots. It was observed that the material surrounding the damage spot was altered producing a 70 μm minimum pixel resolvable separation by induced birrefringence.
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