THE DYE ACTIVATED POLYMERS WITH ADDED FINE SCATTERED PARTICLES AS NEW
LASING MEDIA, V.Bezrodny, E.Tikhonov, Physics Institute of The
Ukrainian Academy of Science; O.Prygodjuk, Vasil P.Yashchuk, Kyiv
T.Shevchenko University, Glushkov av., 6, 03127 Kyiv, Ukraine.
Strong scattering active media are the new group of lasing media.
Lasing of such materials has some specific features: possibility of
small volume generation, low threshold, action without cavity and,
consequently, undirected radiation. The investigation of these media
is of great interest.
We have investigated the superluminescence and lasing spectra of dye
activated (rhodamin 6G) polyvinylacetate samples with added fine
particles under the different scatterer materials (SiO, AlO,
CeO and synthetic diamond), various scatterers concentration and
different pump intensity.
The dependence of lasing bandwidth and maximum of lasing spectrum on
the scatterer materials as well as scatterers concentration was
observed. The lowest observed lasing bandwidth was about 5-8nm for
highest diamond concentration (c=30%). Besides this we have noted the
considerable dependence of lasing threshold on scatterers materials
and on scatterers concentration. This property can be useful for the
tuneable emitter development. The obtained threshold pump intensity of
investigated sample was rather high (~10MWt/sm2) that was probably
conditioned by inhomogeneity of scatterers concentration.
Obtained results verified the possibility of lasing in these systems.
The obtained spectral parameters are typical for multimode dye laser.
To decrease lasing threshold and improve spectral parameters it is
necessary to advance the sample creation technology.