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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:16 |
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Conference: Bucharest University Faculty of Physics 2005 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Influence of the Polyethylene Film on the Polarisation Properties of Monocromatic Laser Light
Authors:
Simona Dontu, Esofina Ristici, D. Savastru, C. Cotirlan, Teodora Brezeanu, M. Ristici*, Eleonora Nemes**, Elena Grosu**
Affiliation:
National Institute of C&D for Optoelectronics INOE -2000, Bucharest,Romania
*Faculty of Physics - University of Bucharest ,Romania
**National Institute of C&D for Plastics INCERPLAST, Bucharest, Romania
E-mail
simona@inoe.inoe.ro
Keywords:
polyethylene film, lasers, polarisation, difussion
Abstract:
Polymers and particularly polyethylene, were not sufficiently studied for different applications and therefore did not meet all the requirements for agriculture. For this reason, a large number of additives were rapidly developed to improve the performances of these polymers in this original application.
Advances at the plastics manufacturing level in such areas as coextrusion and the production of speciality polymers and additives, are resulting in the availability of plastics with improved characteristics.
We have produced an agricultural photoselective three layers coextrusion film, manufactured in a thickness of about 200 microns.
We studied the influence of this film on polarisation properties of two laser radiations. Experimental set-up consists on polarised and unpolarised monocromatic laser light, two polarizers, polyethylene film , a powermeter and a Spiricon LBA-300 PC system.
From our results we are able to conclude that the influence of polyethylene on the monocromatic polarized laser light (594 nm and 633 nm – middle PAR) is very strongly.
Using a Spiricon LBA-300 PC, we have obtained some results on light diffusing by polyethylene film.
From the obtained pictures we can determine a significant variation of the scattering and transmission of the laser radiation fuction on the angle between the extension of coextrusion technology direction and the vibration direction of polarizer.
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