Center for Atomic and Subatomic Physics

Laboratory for Optoelectronics and Lasers

Experimental research in both fundamental and applied aspects of optoelectronics and lasers is conducted in several areas covering mainly classical wave-optics, optical length metrology and solid state lasers. Experiments underway include stabilized lasers used as length standards, analysis of novel holographic photosensitive materials and computer generated holography.

Our laboratory is open for graduate and postgraduate projects.

Head: Dr. Dejan Pantelic

Members:

Associate Members: Dr. Ilija Belic

Founder of the Laboratory: Dr. Milan Popovic

Research Project No.1443: Precise laser spectroscopy: applications to optical trapping, interferometry and optical metrology

Research Project: Metrology of Length

(1) Frequency stabilized He-Ne laser

A stabilized Helium-Neon laser has been developed based on feedback control of laser tube temperature. Error signal, obtained by measuring interferometric fringe visibility (inside modified Michelson interferometer) is used to stabilize the length of laser resonator and, consequently laser frequency (474 THz68MHz). In the future we plan to investigate alternative methods of stabilization (like neural networks instead of PID) and effects of small magnetic fields on the frequency stability.

(2) Frequency stabilized diode-pumped Nd-YAG laser

We have started development of Nd-YAG laser, pumped by laser diodes (2W at 808 nm), which will be stabilized by saturated absorption of cesium dimers. Laser is based on unidirectional ring resonator, which elliminates spatial hole burning and enables single longitudinal mode operation.

Research Project: Holography

(3) Novel photosensitive dichromated holographic materials

Holographic properties of various organic polymer materials (pullulan, pectin, dextran, gelatin,...), doped with chromium ion and organic dyes, are investigated. Diffraction efficiency and sensitivity are measured both in real time (during exposure) and after development. He-Ne lasers (543 nm and 633 nm) and Ar-ion laser (488 nm and 514 nm) are used. Our goal is to improve the holographic sensitivity of photosensitive materials both in blue-green and red part of the spectrum.

(4) Computer generated holograms (CGH)

Photo ploter used for CGH production is constructed. The system consists of X-Y table, controled by the computer, visible diode laser with pinhole filter and focusing optics. Algorithm for detour hologram generation is developed and kinoform algorithm is planned. Microfilm is used for CGH registration.

,

LINKS: AMO research in Serbia

Center for Atomic and Subatomic Physics